CN105466834A - Compression ratio adjustable type porous media plane permeability measurement device and method - Google Patents
Compression ratio adjustable type porous media plane permeability measurement device and method Download PDFInfo
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- CN105466834A CN105466834A CN201510964797.1A CN201510964797A CN105466834A CN 105466834 A CN105466834 A CN 105466834A CN 201510964797 A CN201510964797 A CN 201510964797A CN 105466834 A CN105466834 A CN 105466834A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
Abstract
The invention provides a compression ratio adjustable type porous media plane permeability measurement device and method. The measurement device comprises a measuring cylinder, a ball valve, an extension tube, an upper scale shaft, a lower scale shaft, a pressure plate and a base, wherein the lower surface of the pressure plate and the upper surface of a measuring table of the base are opposite in parallel and are respectively provided with gaskets in an attaching manner, porous media to be measured are arranged among the gaskets, the measuring cylinder is connected with the ball valve, the extension tube and the upper scale shaft in sequence, and an inner cavity of the measuring cylinder, an inner cavity of the ball valve, an inner cavity of the extension tube and an inner pipe of the upper scale shaft form a passage in which measuring liquid flows to the porous media to be measured at the downside of the pressure plate from the mearing cylinder; the upper scale shaft and the pressure plate compress the porous media to be measured to reach the compression ratio needing to be measured, the measuring liquid flows into the center of the porous media to be measured under the action of gravity, and flows out from a radial edge after the porous media to be measured is fully soaked, and the saturated permeability of porous media to be measured in the plane direction under the compression ratio is obtained by combining changes of liquid level of the measuring cylinder, measuring time and other data. The measurement device and method provided by the invention is simple in structure, convenient in operation, high in accuracy, and can be used for measuring the porous media plane permeability under different compression ratios.
Description
Technical field
The present invention relates to material properties test technical field, being specifically related to a kind of measurement mechanism and method of compressibility adjustable type porous medium plane permeability, for testing the permeability in the in-plane of porous medium in different compressibility situation.
Background technology
Porous medium be extensively present in nature and the mankind production, life in.At present, various types of porous media material is applied to the every field such as the energy, material, chemical industry, environmental science, biotechnology, bionics, medical science and agricultural more and more.Permeability, as the important fundamental characteristics of porous medium one, is the important parameter characterizing fluid handling capacity.Because porous medium is in the complicacy of void size, configuration aspects and diversity, the exact value of permeability will rely on experiment measuring usually.In actual applications, porous media material is usually in pressured state and produces distortion, and the deformation extent of porous medium generally represents by compressibility, compressibility=porous medium sample thickness decrement/sample original thickness, it affects highly significant to permeability.Therefore, to build accurately, the method for testing of porous medium permeability in different compressibility situation and device easily, to realizing the further investigation of porous medium and optimizing use and have great importance.
Common methods and the device of existing measurement porous medium permeability mainly also exist following problem:
1, method is too complicated, and device volume is excessive, and experiment easily produces error;
2, most of measuring method and device are applicable to particulate species porous medium, be not too suitable for maybe can produce comparatively big error to fiber-like porous medium;
3, most measuring method and device are applicable to thick and hard porous medium, be not too suitable for maybe can produce comparatively big error to thin and soft porous medium;
4, the compressibility of tested porous medium cannot be regulated accurately, continuously;
5, measure liquid in measuring process and be not full of porous medium completely, cause the permeability result that records inaccurate;
6, the permeability in measurement mechanism specialized range can only be applicable to, cannot measure for the permeability in different order magnitude range and maybe can produce comparatively big error;
7, existing method and device are measured mainly for porous medium thickness direction intrinsic permeability, and the device tested directional permeability in plane is less;
Therefore, need a kind of permeability being suitable for wider range, and can meticulous adjustment porous medium compressibility, for different-thickness porous medium in-plane intrinsic permeability, accurately, measuring method and relevant apparatus easily.
Summary of the invention
The object of the invention is, overcome the deficiencies in the prior art, a kind of measurement mechanism and method of compressibility adjustable type porous medium plane permeability are provided, can the compressibility of the measured porous medium of careful adjustment, thus the plane permeability measured in corresponding compressibility situation, reach the effect that apparatus structure is simple, cost is low, simple to operate.
The present invention is achieved by the following technical solutions:
A measurement mechanism for compressibility adjustable type porous medium plane permeability, is characterized in that: described measurement mechanism comprises graduated cylinder, ball valve, draw-tube, upper yardstick axle, lower yardstick axle, platen and pedestal;
Described upper yardstick axle is formed by fixedly connecting coaxially by the scale axle of a hollow pipe fitting and a tubulose, this hollow pipe fitting is provided with axial interior conduit and the lower end of periphery and top are respectively provided with one section of external thread, the internal diameter of this scale axle is greater than the external diameter of described hollow pipe fitting, be connected to the external thread place on this hollow pipe fitting top, form the interlayer tube chamber of upper end closed between the inwall of described scale axle and the external thread on described hollow pipe fitting top, the bottom of this scale axle outer wall is provided with the scale mark in ring week;
Described pedestal is the bow member erect, and bottom is provided with test desk, and top is provided with through hole;
Described lower yardstick axle is tubular element, its bottom is fixedly connected with the top of described pedestal, top is stretched in the interlayer tube chamber of described upper yardstick axle, the inner tubal wall of this lower yardstick axle is provided with internal thread and is connected with the external thread on the hollow pipe fitting top of described upper yardstick axle, the hollow pipe fitting of described upper yardstick axle passes the through hole on described pedestal top, and on this, yardstick axle can be moved up and down vertically by the rotation of screw thread on described lower yardstick axle, the outer tube wall of this lower yardstick axle is provided with scale mark vertically;
The center of described platen is provided with tapped through hole and is connected on the external thread of described upper yardstick axle lower end, the lower surface of this platen is parallel with the upper surface of the test desk of described pedestal relatively and respectively posted pad, and measured described porous medium is placed between described pad;
Described graduated cylinder is hold the cylindrical vessel measuring liquid, outer peripheral face is provided with the scale mark of the described measurement liquid surplus change of display, described graduated cylinder connects described ball valve, draw-tube and upper yardstick axle successively, and the interior conduit of the inner chamber of the inner chamber of this graduated cylinder, ball valve, the inner chamber of draw-tube and upper yardstick axle forms described measurement liquid is flowed to the measured porous medium on the downside of described platen passage by described graduated cylinder.
As further improvement, described graduated cylinder is all connected by screw thread respectively with between ball valve, between ball valve with draw-tube and between described pedestal with lower yardstick axle, by joint and clamp connection between described draw-tube and upper yardstick axle.
As further improvement, described graduated cylinder and platen adopt the transparent material being convenient to observe or trnaslucent materials to make.
As further improvement, described pad adopts transparent and compression deformation is little silicon rubber to make.
As further improvement, the top of described pedestal is provided with to lock the yardstick lock of described upper yardstick axle.
As further improvement, described graduated cylinder adopts fixed mount to be fixed on applicable height.
As further improvement, described upper yardstick axle and lower yardstick axle adopt stainless steel material to make.
As further improvement, be placed with measurement liquid below described pedestal and connect dish, this measurement liquid connects dish for plastic casing, and diameter is greater than the diameter of described pedestal.
As further improvement, described exhaust liquid and measurement liquid are ethanol water or glycerin solution.
Another technical scheme of the present invention is:
A measuring method for the porous medium plane permeability realized by above-mentioned measurement mechanism, it comprises following concrete steps:
One, prepare before measuring
1) adopt de aerated water allotment exhaust liquid and measure liquid;
2) the measured porous medium of cutting, measures and determines the original thickness of measured porous medium;
3) use alcohol or acetone solvent described graduated cylinder, ball valve, draw-tube, upper yardstick axle, lower yardstick axle, platen, pedestal, Upper gasket and lower gasket to be cleaned up, dry rear assembling and the measurement mechanism of described compressibility adjustable type porous medium plane permeability is installed;
4) between described Upper gasket and lower gasket, measured porous medium is placed, rotate the height regulating described upper yardstick axle and platen, described Upper gasket and lower gasket are close to and compress measured porous medium, measure the test thickness obtaining measured porous medium, calculate the test compression rate determining measured porous medium according to the following formula:
Test compression rate=measured porous medium thickness reduction/original thickness,
Measured porous medium decrement=original thickness-test thickness;
The thickness of measured porous medium obtains according to following method:
With the scale value of the scale datum line of described lower yardstick axle for the described upper yardstick axle of benchmark reading, again with the scale value of the scale datum line of described upper yardstick axle for the described lower yardstick axle of benchmark reading, on this yardstick axle scale value be added with lower yardstick axle scale value and, be the thickness of measured porous medium;
Two, be vented
Open described ball valve, continue to pour exhaust liquid in described graduated cylinder, exhaust liquid is made to flow through graduated cylinder, ball valve, draw-tube and upper yardstick axle successively, flow into the center of measured porous medium, flow out after radially flowing through the radius of measured porous medium again, the side surface place bubble-free of observing described platen place and measured porous medium remains, and can confirm the exhaust liquid measured porous medium of complete wetting, stops pouring exhaust liquid into;
Three, measurement data also calculates and obtains permeability
1) by observing the scale mark on described graduated cylinder, be recorded in certain Measuring Time start and at the end of measure the liquid level of liquid in described graduated cylinder;
2) consult measurement fluid viscosity according to described measurement liquid and measure liquid-tight degree;
3) according to the plane permeability of following formulae discovery measured porous medium under the condition of described test compression rate:
Wherein,
K is the plane permeability of measured porous medium,
A is the sectional area of the inner chamber of graduated cylinder,
R
samplefor the radius of measured porous medium,
R
chifor the internal diameter of the interior conduit of upper yardstick axle,
Δ t is Measuring Time,
H
1for measuring the liquid level of liquid in graduated cylinder when Measuring Time starts,
H
2for measuring the liquid level of liquid in graduated cylinder at the end of Measuring Time,
μ is measurement fluid viscosity,
ρ is the liquid-tight degree of measurement,
G is acceleration of gravity,
H is the test thickness of measured porous medium.
Compared with prior art, the invention has the beneficial effects as follows:
1. structure of the present invention is simple, and cost is low, easy to operate, is easy to make and maintenance, is particularly suitable for the in-plane permeability that measurement has higher compressible polytype porous medium (comprising fiber multihole medium and particle porous medium).
2. the porous medium under regulating the height of upper yardstick axle and platen can obtain different-thickness, thus change thickness parameter and the compressibility of porous medium, in measuring process measured porous medium compressibility can continuous precision adjustable, thus can obtain porous medium permeability and compressibility according to change relation.
3. the upper and lower pad of silicon rubber system of fixing measured porous medium can fit tightly with porous medium, effectively prevent the side leakage of thickness direction being measured liquid.
4. the pressure reduction of measured porous medium uses waterpower impetus change list to levy, and accuracy is high, convenient, has saved testing cost.
5. be vented liquid and measure the ethanol water of special proportioning and glycerin solution that liquid adopts experimental study to obtain, ensure that measured porous medium is single-phase saturated, eliminate the interference of other fluids, measurement result is more accurate.
Accompanying drawing explanation
Fig. 1 is device schematic diagram of the present invention.
Fig. 2 is the structural representation of upper yardstick axle and platen.
Fig. 3 is the structural representation of lower yardstick axle.
In figure: 1 graduated cylinder, 2 ball valves, 3 draw-tubes, yardstick axle on 4,5 times yardstick axles, 6 pedestals, 7 yardstick locks, 8 platens, 9 tested porous mediums, 10 Upper gaskets, 11 lower gaskets, 12 external threads, 13 internal thread through hole, 14 scale axles, 15 external threads, 16 hollow pipelines, 17 external threads, 18 internal threads.
Embodiment
The invention provides a kind of measurement mechanism and method of compressibility adjustable type porous medium plane permeability, for compressibility and the permeability measured in corresponding compressibility situation of careful adjustment porous medium, comprise utilize massfraction be 40% ethanol water impregnating porous medium exhaust, ensure single-phase saturated; The permeability of porous medium under different compressibility is accurately measured continuously by described measurement mechanism; And when measuring the porous medium of different magnitude permeability, adopt measurement liquid and the measurement mechanism of different formulations.
Below in conjunction with accompanying drawing and concrete example, structure of the present invention is described in further detail, but can not limits the scope of the invention with this.
Refer to Fig. 1, the measurement mechanism of diagram compressibility adjustable type porous medium plane permeability comprises graduated cylinder 1, ball valve 2, draw-tube 3, upper yardstick axle 4, lower yardstick axle 5, platen 8, yardstick lock 7 and pedestal 6.
Described pedestal 6 is the bow member erect, and bottom is provided with protruding test desk, and top is provided with through hole.
Refer to Fig. 2, described upper yardstick axle 4 is formed by fixedly connecting coaxially by the scale axle 14 of a hollow pipe fitting and a tubulose.The external diameter of described hollow pipe fitting is 8mm, and length is 135mm, is provided with the interior conduit 16 that axial internal diameter is 6.5mm, and the lower end of this hollow pipe fitting periphery is provided with one section of external thread 12, and the top of periphery is provided with one section of external thread 15.The internal diameter of described scale axle 14 is 9mm, be greater than the external diameter of described hollow pipe fitting, this scale axle 14 is connected to external thread 15 place on this hollow pipe fitting top, the interlayer tube chamber of upper end closed is formed between the external thread 15 on inwall and described hollow pipe fitting top, the external diameter of described scale axle 14 is 10.25mm, and length is 51mm.
Refer to Fig. 3, described lower yardstick axle 5 is tubular element, and internal diameter is 8mm, external diameter is 18mm, length is 55mm, and its bottom is provided with the external thread 17 that length is 5mm, pitch is 0.5mm, external diameter is 16mm, thus is fixedly connected with by screw thread with the top of described pedestal 6.Engagement threads is passed through between described upper yardstick axle 4 and lower yardstick axle 5, the top of this lower yardstick axle 5 is stretched in the interlayer tube chamber of described upper yardstick axle 4, the inner tubal wall of lower yardstick axle 5 is provided with internal thread 18, and be connected with the external thread 15 on the hollow pipe fitting top of described upper yardstick 4, pitch is 0.5mm.The hollow pipe fitting of described upper yardstick axle 4 passes the through hole on described pedestal 6 top, and described lower yardstick axle 5 is fixed, and on this, yardstick axle 4 can be moved up and down vertically by the rotation of screw thread and carry out helical motion on described lower yardstick axle 5.
Refer to Fig. 2, the center of described platen 8 is provided with internal thread through hole 13, be connected, and pitch is 0.5mm with the external thread 12 of described upper yardstick axle 4 lower end.Refer to Fig. 1, the lower surface of described platen 8 is parallel with the upper surface of the test desk of described pedestal 6 relatively and respectively posted Upper gasket 10 and lower gasket 11, and measured described porous medium 9 is flatly placed between described Upper gasket 10 and lower gasket 11.
Described measured porous medium 9 is the smooth right cylinders of both ends of the surface, diameter according to survey permeability scope determine.Described Upper gasket 10 and lower gasket 11 are the silicon rubber material plectane of low compression deformation, transparent and compression deformation is little, its diameter is identical with the diameter of measured porous medium 9, can fit tightly with this measured porous medium 9, thus fix the both ends of the surface up and down of measured porous medium 9, and prevent from measuring the thickness direction generation side leakage of liquid by described measured described porous medium 9.
Described platen 8 adopts the transparent material or trnaslucent materials being convenient to observe, as organic glass is made, can observe described measured porous medium 9 whether single-phase saturated while that its pressurized being indeformable.The diameter of described platen 8 and the diameter of the test desk of described pedestal 6 are all identical with the diameter of described measured porous medium 9.
Described upper yardstick axle 4 and lower yardstick axle 5 are stainless steel material and make, corrosion-resistant.The bottom of scale axle 14 outer wall of described upper yardstick axle 4 is provided with the scale mark in ring week, circumference is divided into 50 deciles, the lower edge of this scale axle 14, namely the lower edge of described upper yardstick axle 4 is the scale datum line of yardstick axle 4 on this, with the helical motion of yardstick axle 4 on this, all scale marks of this ring also rotate, because the pitch of external thread 15 and internal thread 18 is 0.5mm, so when upper yardstick axle 4 rotates a circle, described platen 8 advances or a slow astern pitch 0.5 millimeter.The outer tube wall of described lower yardstick axle 5 is provided with scale mark vertically, see Fig. 1, centre is a vertical curve, i.e. the scale datum line of described lower yardstick axle 5, this line left and right respectively has a column pitch to be the scale mark of 1 millimeter, the centre of the scale mark on the left side two adjacent scale marks on the right just.During measurement, with the scale value of the scale datum line of described lower yardstick axle 5 for the described upper yardstick axle 4 of benchmark reading, again with the scale value of the scale datum line of described upper yardstick axle 4 for the described lower yardstick axle 5 of benchmark reading, on this yardstick axle scale value be added with lower yardstick axle scale value and, be the thickness of measured porous medium 9.
Refer to Fig. 1, described yardstick lock 7 is placed in the top of described pedestal 6, according to needing locked fixing described upper yardstick axle 4, causes measuring error to prevent the movement of yardstick axle 4 on this.
Described graduated cylinder 1 is hold the cylindrical vessel measuring liquid, fixed mount is adopted to be fixed on applicable height, this graduated cylinder 1 uses transparent or semitransparent material to make, can the change of externally clear described measurement liquid liquid level, the outer peripheral face of described graduated cylinder 1 is provided with the scale mark of the described measurement liquid surplus change of display.Described graduated cylinder 1 connects described ball valve 2, draw-tube 3 and upper yardstick axle 4 successively and is sealed and matched respectively.Described graduated cylinder 1 is all connected by screw thread respectively with between ball valve 2 and between ball valve 2 with draw-tube 3, wherein, the external diameter of described ball valve 2 is 16mm, upper-end inner diameter is 12mm, bottom diameter is 14mm, upper and lower two ends are respectively provided with the internal thread of the long 0.5mm pitch of one section of 5mm, are connected respectively with described graduated cylinder 1 and draw-tube 3; The internal diameter of described graduated cylinder 1 is 50mm, and external diameter is 54mm, and length is 305mm, and lower end is provided with the interface of long 5mm, and the external diameter of this interface is 12mm, and internal diameter is 8mm, and it is the external thread of 0.5mm that periphery is provided with the pitch be connected with described ball valve 2 upper end; Described draw-tube 3 is the adjustable pipelines of length, its external diameter equals the internal diameter of described ball valve 2 lower end, for 14mm, it is the external thread of 0.5mm that upper end is provided with the pitch be connected with described ball valve 2, the internal diameter of this draw-tube 3 equals the external diameter of described upper yardstick axle 4, for 10mm, by special joint and clamp connection between its lower end and described upper yardstick axle 4.
The inner chamber of the inner chamber of described graduated cylinder 1, the inner chamber of ball valve 2, draw-tube 3 and the interior conduit 16 of upper yardstick axle 4 form described measurement liquid is flowed to the measured porous medium on the downside of described platen 8 passage by described graduated cylinder 1, make this measurement liquid accurately flow into the center of described measured porous medium 9.
Described measurement liquid adopt ethanol massfraction be 40% aqueous solution or glycerine massfraction be the aqueous solution of 80%, ensure the single-phase flowing of measured porous medium 9, get rid of the interference of other fluids.During work, measure liquid and be stored in described graduated cylinder 1, accurately flow into the center of measured porous medium 9 through described passage, then flow out radially flow through its radius in measured porous medium 9 after.Before measuring, ethanol massfraction be 40% aqueous solution can also be used as exhaust liquid.
Be placed with below described pedestal 6 and measure liquid and connect dish, this measurement liquid connects dish for round plastic box, and diameter is greater than the diameter of described pedestal 6, the smooth and surface level of box inside surface.
The foundation that the present invention carries out testing is Darcy law derivation formula:
When the present invention works, yardstick axle and platen is used to fix measured porous medium, and compress measured porous medium to the compressibility needing to measure, the interior conduit of graduated cylinder, ball valve, draw-tube and upper yardstick axle forms the pipeline measured liquid and flow through, then liquid accurately can flow into measured porous medium under gravity center along above-mentioned pipeline is measured, flow out from the radial edges of measured porous medium after the measured porous medium of complete wetting, in conjunction with the change (h of liquid level on graduated cylinder
1, h
2), the Measuring Time (Δ t) that experiences of this process and other given datas (μ, a, R
sample, R
chi, H, ρ, g) this compressibility can be obtained under saturated permeability in measured porous medium plane on direction.
The present invention carries out the derivation formula according to the planar radial seepage flow for Darcy law of testing:
Flow model in porous medium adopts Darcy law usually, Darcy law mainly describes the flow behavior of Newtonian fluid in porous medium, shows to flow through the measurement liquid volumetric flow rate (Q) on tested side medium surface and tested dielectric thickness (H), upper yardstick axle interior conduit internal diameter (R in time per unit
chi) and tested medium in pressure reduction (Δ P) be directly proportional, with tested medium radius (R
sample) and viscosity (μ) be inversely proportional to; Proportional coefficient K is defined as the permeability of tested medium.
During described measurement mechanism work, rotate the measured porous medium 9 under regulating the height of upper yardstick axle 4 and platen 8 can obtain different-thickness, thus change thickness parameter and the compressibility of measured porous medium 9, obtain the compressibility (original thickness of compressibility=measured porous medium 9 thickness reduction/measured porous medium 9) needing to measure, measuring liquid can under gravity along graduated cylinder 1, ball valve 2, the interior conduit 16 of draw-tube 3 and upper yardstick axle 4 accurately flows into the center of measured porous medium 9, flow out from the radial side of measured porous medium 9 after the measured porous medium of complete wetting 9, in this certain hour (Δ t), the pressure reduction (Δ P) measured in liquid volumetric flow rate (Q) and measured porous medium 9 all changes (h with the liquid level in graduated cylinder 1
1, h
2) relevant, above-mentioned relation is substituted into, is obtained by infinitesimal analysis form of the present invention according to derivation formula:
Together with other given datas (μ, a, the R of this process
sample, R
chi, H, ρ, g) this compressibility can be obtained under measured porous medium 9 interior directional permeabilitys (K).
In permeability survey process, measure liquid and select ethanol water or glycerin solution, adopt above-mentioned segregation drive head pressuring method, the concrete steps of measuring method are as follows:
One, prepare before measuring.
1) allocate respectively enough ethanol massfractions be 40% aqueous solution and glycerine massfraction be the aqueous solution of 80%, the water used when wherein it should be noted that allotment is de aerated water.
2) the permeability order magnitude range at measured porous medium 9 place is roughly determined, the measurement formula of liquid adopted when determining thus to measure and the diameter dimension of corresponding apparatus structure scheme, Upper gasket 10 and lower gasket 11, according to the described porous medium 9 that the size cutting of lower gasket 11 is measured, the thickness of the described porous medium 9 that repetitive measurement is measured, getting caulocarpic mean value is original thickness.
3) use ethanol massfraction be 40% aqueous solution or acetone equal solvent the oily matter on the surface of graduated cylinder 1, ball valve 2, draw-tube 3, upper yardstick axle 4, platen 8, pedestal 6, yardstick lock 7, Upper gasket 10 and lower gasket 11 and interior conduit is rinsed well, dry, according to each several part of anatomical connectivity shown in Fig. 1 assembly, junction encapsulation process, assembles and installs the measurement mechanism of described compressibility adjustable type porous medium plane permeability.
4) Upper gasket 10 and lower gasket 11 are separately fixed on platen 8 and pedestal 6, then between two pieces of pads, place measured described porous medium 9; Rotate the height regulating upper yardstick axle 4 and platen 8, Upper gasket 10 and lower gasket 11 is made to be close to measured described porous medium 9, determine the test thickness of measured described porous medium 9, thus determine the test compression rate (described porous medium 9 thickness reduction of compressibility=measured/measured described porous medium 9 original thickness) of measured described porous medium 9.
Two, be vented
Open ball valve 2, pouring enough ethanol massfractions into is that the aqueous solution of 40% is as exhaust liquid, exhaust liquid is made to flow through the interior conduit 16 of graduated cylinder 1, ball valve 2, draw-tube 3, upper yardstick axle 4 successively, within the scope of the diameter 6.5mm of described porous medium 9 central point that accurate inflow is measured, flow out radially flow through medium radius in measured described porous medium 9 after; Continue to pour measurement liquid into, the seepage flow liquid measured porous medium of complete wetting 9 rear (can remain from transparent platen 8 and side medium Skin Exit place bubble-free and judge), stops pouring exhaust liquid into by the time; Pour de aerated water into again, flushing pipe a period of time, close ball valve 2.
Three, measurement data, and calculate permeability.
1) the measurement liquid volumetric flow rate (Q) flowing through measured porous medium 9 side surface in certain Measuring Time (Δ t) can by liquid level change (h in graduated cylinder 1
1, h
2) be multiplied by graduated cylinder 1 inner tube surface long-pending (a) and obtain divided by Measuring Time (Δ t).
2) graduated cylinder 1 inner tube surface long-pending (a) can be multiplied by π according to the internal diameter of graduated cylinder 1 square and obtains.
3) the interior conduit 16 internal diameter (R of upper yardstick axle 4
chi) be 3.25mm, the radius (R of measured porous medium 9
sample) 25mm.
4) the test thickness (H) of measured porous medium 9 can be added by the scale value of upper and lower yardstick axle and obtain, pronunciation is as follows: with the scale value of the scale datum line of described lower yardstick axle 5 for the described upper yardstick axle 4 of benchmark reading, again with the scale value of the scale datum line of described upper yardstick axle 4 for the described lower yardstick axle 5 of benchmark reading, on this yardstick axle scale value be added with lower yardstick axle scale value and, be the test thickness (H) of measured porous medium.
5) By consulting literatures obtains, and measure fluid viscosity (μ), measure liquid-tight degree (ρ), acceleration of gravity (g) is known.
6) numerical value of above-mentioned physical quantity is substituted into the derivation formula of the planar radial seepage flow of Darcy law:
The plane permeability (K) of measured porous medium 9 under test compression rate can be tried to achieve.
In formula,
K is the plane permeability of measured porous medium,
A is the sectional area of the inner chamber of graduated cylinder,
R
samplefor the radius of measured porous medium,
R
chifor the internal diameter of the interior conduit of upper yardstick axle,
Δ t is Measuring Time,
H
1for measuring the liquid level of liquid in graduated cylinder when Measuring Time starts,
H
2for measuring the liquid level of liquid in graduated cylinder at the end of Measuring Time,
μ is measurement fluid viscosity,
ρ is the liquid-tight degree of measurement,
G is acceleration of gravity,
H is the test thickness of measured porous medium.
In above-mentioned steps, for the measured described porous medium 9 within the scope of low-permeability, can adopt ethanol massfraction be the aqueous solution of 40% as measurement liquid, change specimen finish, stream bore and the method for graduated cylinder internal diameter simultaneously and adjust, make device be suitable for this permeability range; Measured described porous medium 9 for middle permeability range can adopt ethanol massfraction to be that the aqueous solution of 40% is as measurement liquid; Measured described porous medium 9 for high permeability scope can adopt glycerine massfraction to be that the aqueous solution of 80% is as measurement liquid.
Application examples:
The GFD-4.6 graphite felt of measurement mechanism of the present invention to SGL company is utilized to carry out permeability survey.Actual measurement sample is the disc-shaped carbon felt of thickness 4.6mm, diameter 50mm, and measure liquid and adopt ethanol massfraction to be the aqueous solution of 40%, temperature is 20 DEG C, and this ethanol water density is 0.935gcm
3, viscosity is 2.91mPas.As shown in the following chart, take off several different typical compression rate (in table, institute's thickness of getting and a difference just conveniently compare) listed in table, then carry out permeability survey.Experiment results proved, the thickness under each compressibility all can obtain, and compressibility can completely freely adjust between 0 to 57% simultaneously.Measure three times under each compressibility, average, obtain test findings as following table:
| Numbering | Sample original thickness mm | Sample testing thickness mm | Compressibility % | Permeability Darcy |
| 1 | 4.6 | 4.5 | 2 | 90 |
| 2 | 4.6 | 4 | 13 | 65 |
| 3 | 4.6 | 3.5 | 24 | 46 |
| 4 | 4.6 | 3 | 35 | 39 |
| 5 | 4.6 | 2.5 | 46 | 35 |
| 6 | 4.6 | 2 | 57 | 20 |
The matching degree of the GFD-4.6 graphite felt Permeability Parameters that test findings and SGL company provide is very high.Therefore, measuring method of the present invention and device can carry out the Measurement accuracy of porous medium plane permeability under different compressibility.
Should be understood that, to those skilled in the art, can be equal to foregoing or equivalent improvement or change, and all these improvements and changes all should belong to protection domain of the presently claimed invention.
Claims (10)
1. a measurement mechanism for compressibility adjustable type porous medium plane permeability, is characterized in that: described measurement mechanism comprises graduated cylinder, ball valve, draw-tube, upper yardstick axle, lower yardstick axle, platen and pedestal;
Described upper yardstick axle is formed by fixedly connecting coaxially by the scale axle of a hollow pipe fitting and a tubulose, this hollow pipe fitting is provided with axial interior conduit and the lower end of periphery and top are respectively provided with one section of external thread, the internal diameter of this scale axle is greater than the external diameter of described hollow pipe fitting, be connected to the external thread place on this hollow pipe fitting top, form the interlayer tube chamber of upper end closed between the inwall of described scale axle and the external thread on described hollow pipe fitting top, the bottom of this scale axle outer wall is provided with the scale mark in ring week;
Described pedestal is the bow member erect, and bottom is provided with test desk, and top is provided with through hole;
Described lower yardstick axle is tubular element, its bottom is fixedly connected with the top of described pedestal, top is stretched in the interlayer tube chamber of described upper yardstick axle, the inner tubal wall of this lower yardstick axle is provided with internal thread and is connected with the external thread on the hollow pipe fitting top of described upper yardstick axle, the hollow pipe fitting of described upper yardstick axle passes the through hole on described pedestal top, and on this, yardstick axle can be moved up and down vertically by the rotation of screw thread on described lower yardstick axle, the outer tube wall of this lower yardstick axle is provided with scale mark vertically;
The center of described platen is provided with tapped through hole and is connected on the external thread of described upper yardstick axle lower end, the lower surface of this platen is parallel with the upper surface of the test desk of described pedestal relatively and respectively posted pad, and measured described porous medium is placed between described pad;
Described graduated cylinder is hold the cylindrical vessel measuring liquid, outer peripheral face is provided with the scale mark of the described measurement liquid surplus change of display, described graduated cylinder connects described ball valve, draw-tube and upper yardstick axle successively, and the interior conduit of the inner chamber of the inner chamber of this graduated cylinder, ball valve, the inner chamber of draw-tube and upper yardstick axle forms described measurement liquid is flowed to the measured porous medium on the downside of described platen passage by described graduated cylinder.
2. the measurement mechanism of compressibility adjustable type porous medium plane permeability according to claim 1, it is characterized in that: described graduated cylinder is all connected by screw thread respectively with between ball valve, between ball valve with draw-tube and between described pedestal with lower yardstick axle, by joint and clamp connection between described draw-tube and upper yardstick axle.
3. the measurement mechanism of compressibility adjustable type porous medium plane permeability according to claim 1, is characterized in that: described graduated cylinder and platen adopt the transparent material being convenient to observe or trnaslucent materials to make.
4. the measurement mechanism of compressibility adjustable type porous medium plane permeability according to claim 1, is characterized in that: described pad adopts transparent and compression deformation is little silicon rubber to make.
5. the measurement mechanism of compressibility adjustable type porous medium plane permeability according to claim 1, is characterized in that: the top of described pedestal is provided with to lock the yardstick lock of described upper yardstick axle.
6. the measurement mechanism of compressibility adjustable type porous medium plane permeability according to claim 1, is characterized in that: described graduated cylinder adopts fixed mount to be fixed on applicable height.
7. the measurement mechanism of compressibility adjustable type porous medium plane permeability according to claim 1, is characterized in that: described upper yardstick axle and lower yardstick axle adopt stainless steel material to make.
8. the measurement mechanism of compressibility adjustable type porous medium plane permeability according to claim 1, is characterized in that: be placed with measurement liquid below described pedestal and connect dish, this measurement liquid connects dish for plastic casing, and diameter is greater than the diameter of described pedestal.
9. the measurement mechanism of compressibility adjustable type porous medium plane permeability according to claim 1, is characterized in that: described exhaust liquid and measurement liquid are ethanol water or glycerin solution.
10., by a measuring method for the porous medium plane permeability of measurement mechanism realization described in claim 1, it is characterized in that: described method comprises following concrete steps:
One, prepare before measuring
1) adopt de aerated water allotment exhaust liquid and measure liquid;
2) the measured porous medium of cutting, measures and determines the original thickness of measured porous medium;
3) use alcohol or acetone solvent described graduated cylinder, ball valve, draw-tube, upper yardstick axle, lower yardstick axle, platen, pedestal, Upper gasket and lower gasket to be cleaned up, dry rear assembling and the measurement mechanism of described compressibility adjustable type porous medium plane permeability is installed;
4) between described Upper gasket and lower gasket, measured porous medium is placed, rotate the height regulating described upper yardstick axle and platen, described Upper gasket and lower gasket are close to and compress measured porous medium, measure the test thickness obtaining measured porous medium, calculate the test compression rate determining measured porous medium according to the following formula:
Test compression rate=measured porous medium thickness reduction/original thickness,
Measured porous medium decrement=original thickness-test thickness;
The thickness of measured porous medium obtains according to following method:
With the scale value of the scale datum line of described lower yardstick axle for the described upper yardstick axle of benchmark reading, again with the scale value of the scale datum line of described upper yardstick axle for the described lower yardstick axle of benchmark reading, on this yardstick axle scale value be added with lower yardstick axle scale value and, be the thickness of measured porous medium;
Two, be vented
Open described ball valve, continue to pour exhaust liquid in described graduated cylinder, exhaust liquid is made to flow through graduated cylinder, ball valve, draw-tube and upper yardstick axle successively, flow into the center of measured porous medium, flow out after radially flowing through the radius of measured porous medium again, the side surface place bubble-free of observing described platen place and measured porous medium remains, and can confirm the exhaust liquid measured porous medium of complete wetting, stops pouring exhaust liquid into;
Three, measurement data also calculates and obtains permeability
1) by observing the scale mark on described graduated cylinder, be recorded in certain Measuring Time start and at the end of measure the liquid level of liquid in described graduated cylinder;
2) consult measurement fluid viscosity according to described measurement liquid and measure liquid-tight degree;
3) according to the plane permeability of following formulae discovery measured porous medium under the condition of described test compression rate:
Wherein,
K is the plane permeability of measured porous medium,
A is the sectional area of the inner chamber of graduated cylinder,
R
samplefor the radius of measured porous medium,
R
chifor the internal diameter of the interior conduit of upper yardstick axle,
Δ t is Measuring Time,
H
1for measuring the liquid level of liquid in graduated cylinder when Measuring Time starts,
H
2for measuring the liquid level of liquid in graduated cylinder at the end of Measuring Time,
μ is measurement fluid viscosity,
ρ is the liquid-tight degree of measurement,
G is acceleration of gravity,
H is the test thickness of measured porous medium.
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| CN107502761A (en) * | 2017-08-16 | 2017-12-22 | 江西理工大学 | A kind of acceleration permeability apparatus suitable for ion type rareearth mine in_situ leaching |
| CN113776750A (en) * | 2021-08-31 | 2021-12-10 | 沈阳航空航天大学 | Leakage quantity testing device capable of adjusting compression quantity for elastic metal sealing |
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| AU2003247372A1 (en) * | 2002-02-21 | 2003-09-09 | Institut Francais Du Petrole | Method and device for evaluating physical parameters of an underground deposit from rock cuttings sampled therein |
| CN1570602A (en) * | 2003-03-26 | 2005-01-26 | 法国石油研究所 | Method and device for evaluating physical parameters of an underground reservoir from rock cuttings taken therefrom |
| CN101995373A (en) * | 2010-11-24 | 2011-03-30 | 中国科学院武汉岩土力学所 | Method and device for measuring pore volume change of porous medium |
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| AU2003247372A1 (en) * | 2002-02-21 | 2003-09-09 | Institut Francais Du Petrole | Method and device for evaluating physical parameters of an underground deposit from rock cuttings sampled therein |
| AU2003247372A8 (en) * | 2002-02-21 | 2003-09-09 | Inst Francais Du Petrole | Method and device for evaluating physical parameters of an underground deposit from rock cuttings sampled therein |
| CN1570602A (en) * | 2003-03-26 | 2005-01-26 | 法国石油研究所 | Method and device for evaluating physical parameters of an underground reservoir from rock cuttings taken therefrom |
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| CN107502761A (en) * | 2017-08-16 | 2017-12-22 | 江西理工大学 | A kind of acceleration permeability apparatus suitable for ion type rareearth mine in_situ leaching |
| CN107502761B (en) * | 2017-08-16 | 2019-05-14 | 江西理工大学 | A kind of acceleration permeability apparatus suitable for ion type rareearth mine in_situ leaching |
| CN113776750A (en) * | 2021-08-31 | 2021-12-10 | 沈阳航空航天大学 | Leakage quantity testing device capable of adjusting compression quantity for elastic metal sealing |
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| CN105466834B (en) | 2018-01-23 |
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