CN105784561A - Porous material multi-field coupling permeability measurement device and measurement method thereof - Google Patents
Porous material multi-field coupling permeability measurement device and measurement method thereof Download PDFInfo
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- CN105784561A CN105784561A CN201610127501.5A CN201610127501A CN105784561A CN 105784561 A CN105784561 A CN 105784561A CN 201610127501 A CN201610127501 A CN 201610127501A CN 105784561 A CN105784561 A CN 105784561A
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- 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
Abstract
The invention provides a porous material multi-field coupling permeability measurement device and a measurement method thereof.The measurement device comprises an outer barrel, an inner barrel and an end cover; a porous material to be measured divides an inner cavity of the inner barrel into a liquid inlet cavity and a liquid drainage cavity, and three sets of liquid level indicating devices are installed in the liquid inlet cavity; when the liquid level reaches the upper liquid level indicating devices, adding of liquid is stopped, and a control system measures time and completes the automatic water adding function according to values returned by the middle liquid level indicating devices and the lower liquid level indicating devices.The heat preservation and insulation effect is achieved by means of a heat preservation cavity formed between the inner barrel and the outer barrel, and an error can be reduced to the minimum during the temperature measurement process.A temperature sensor is installed on the portion, at the upper end of the porous material, of the liquid inlet cavity and can accurately measure real-time temperature; when the temperature is lower than the set temperature, the control system heats liquid flowing into the liquid inlet cavity through a liquid inlet pipe in a liquid vessel outside the device, the temperature can always reach the set temperature, and therefore measurement of the permeability of the porous materials in coupled fields is comprehensively considered.
Description
Technical field
The present invention relates to a kind of measuring device of multi-field coupling permeability for porous materials and measuring method.Especially for flow field, the measurement apparatus of the lower artificial bone scaffold permeability of temperature field coupling and measuring method.
Background technology
At present, permeability survey is mainly concentrated for coal petrography, sandy soil, rock field, measuring method is based primarily upon constant head and varying head measuring principle, boring constant head water injection test is applicable to the stronger rock-soil layer of the following permeability of level of ground water, and varying head water injection test is applicable to the rock-soil layer that more than level of ground water, permeability are little.The measuring instrument certainty of measurement of principle invention is low according to this, and complex operation, speed is slow.Along with porous support is in the application of biomedical sector and popularization, evaluate the permeance property quality also ever more important of biological stephanoporate bracket material.In organizational project, the aperture size of timbering material and porosity can affect propagation and the activity of seed cell, and bigger aperture size is conducive to the growth of cambium, and high porosity also provides bigger amplification for cell and migrates space.Therefore, aperture size and porosity are considered as the important feature parameter of timbering material all the time, and permeability survey instrument is then a kind of instrument measuring porous material infiltration coefficient.And relative to the infiltration coefficient of porous material support, also ever more important is evaluated for nutritional solutions such as serum albumin under body temperature (37 degree), its measured value is the critical evaluation index that biological stephanoporate bracket material survives after bone grafting, therefore, the invention of porous support materials measuring instrument for permeability rate is significant at biomedical tissue engineering field.
The liquid seepage of the porous material infiltration coefficient that variable water level method measures must is fulfilled for laminar flow condition.The method measures the determining instrument of porous material infiltration coefficient and still needs to improve in following two:
(1) owing to not accounting for the temperature field impact on infiltration coefficient, therefore the coefficient of kinetic viscosity of permeation liquid necessarily causes the infiltration coefficient of the porous material can not measured under different temperatures, it is only capable of being similar to the infiltration coefficient of reflection different temperatures seepage flow liquid from macroscopic measurement；
(2) owing to the artificial method of subjectivity obtains the measurand of infiltration coefficient, therefore measurand is relatively many, and infiltration coefficient operation and calculating are easy.Its measurement device variable can reduce, and operational approach and instrument itself have much room for improvement.
In constant head test method, head difference is easily measured but is easily fluctuated, and this measurement instrument also relative complex, and the environmental change of system external circle is sensitive；Secondly, the method complicated operation, it is necessary to a lot of aided measurement devices have cooperated, therefore measures porous material permeability time-consuming, and the method does not consider the temperature factor impact on porous material permeability equally.
Patent of invention 201020522989.X discloses a kind of porous material coupled multiphysics permeability measuring apparatus, the method needs mounting temperature sensor, pressure transducer, microflow sensor, the variable measured is more, easily produce bigger error, and operating inconvenience, the accurate measurement for biological bone support permeability has more been difficult to.Patent of invention 200420007652 discloses a kind of Multifunctional road material infiltration gauge, first he utilizes the pressure reduction of water tank and test container to maintain feed liquor, thus it cannot be guaranteed that accurate flow, next utilizes the quality of water that balance measurement seepage flow goes out, so cause error propagation, affect certainty of measurement.Patent of invention 201420561068.2 discloses drilling well mud cake permeability measuring apparatus, it is achieved that the permeability survey to thin ooze cake.Foregoing invention instrument does not all consider the variations in temperature impact on porous material permeability.Actually the change of temperature directly affects the microstructure of porous media, so directly affects the accuracy of permeability survey.Porous material low-permeability under temperature and pressure coupling condition is measured and has caused this field focus of attention.Biological stephanoporate bracket permeability survey at temperature and flow field coupling condition is not had been reported that.
Summary of the invention
It is an object of the invention to, for existing porous material permeability survey when multi-scenarios method field, do not consider the deficiency that permeance property is affected by variations in temperature, it is provided that a kind of new measuring device of multi-field coupling permeability for porous materials and measuring method thereof.
The technical scheme is that
Described a kind of measuring device of multi-field coupling permeability for porous materials, it is characterised in that: include urceolus, inner core, end cap；Inner tube installation is in urceolus, and inner core and urceolus are closed by end cap；
Being incubation cavity between inner core and urceolus, incubation cavity is by soak cycles liquid inlet and soak cycles liquid outlet and environmental liquids reservoir；
Porous material to be measured is placed on the installation table top of inner core internal face, and the restrained structure in porous material upper end to be measured compresses；The outside wall surface of porous material to be measured and inner core internal face closely cooperate；Interior tube inner chamber is divided into the admission chamber above porous material to be measured and the exhaust chamber below porous material to be measured by porous material to be measured；
Admission chamber is connected by input duct with environmental liquids container；Having temperature measuring equipment to extend into sap cavity, temperature measuring equipment can measure temperature of liquid in admission chamber；Also having on admission chamber internal face and be provided with at least three place's level instruction devices, level instruction device is connected with external data acquisition control system；
Exhaust chamber is connected by discharging tube with the external world.
Further preferred version, described a kind of measuring device of multi-field coupling permeability for porous materials, it is characterised in that: described restraining structure adopts sleeve；Sleeve lower end and porous material upper end to be measured compression fit, sleeve upper end is by sealing ring and end cap compression fit；Sleeve outer wall face and inner core internal face closely cooperate.
Further preferred version, described a kind of measuring device of multi-field coupling permeability for porous materials, it is characterised in that: porous material to be measured is spongy bone sample.
Adopt the method that said apparatus carries out porous material multi-scenarios method permeability survey, it is characterised in that: comprise the following steps:
Step 1: the liquid in liquid container is heated to external world, when reaching temperature required, stops heating, enters step 2；When environmental liquids liquid in containers temperature is lower than, time temperature required, restarting heating, until reaching temperature required；
Step 2: close the discharging tube of exhaust chamber, respectively through input duct and soak cycles liquid inlet, the liquid in environmental liquids container is passed into admission chamber and incubation cavity, in incubation cavity, liquid returns environmental liquids container from soak cycles liquid outlet；When in admission chamber, liquid height meets or exceeds the top level instruction device, stop passing into liquid to admission chamber；Adopt temperature measuring equipment to measure temperature of liquid in admission chamber, if the temperature of liquid recorded is lower than temperature required, then open discharging tube, liquid in inner core is all discharged, return step 1；If the temperature of liquid recorded reaches temperature required, enter step 3；
Step 3: open discharging tube, when liquid level drops to middle position level instruction device in admission chamber, starts timing, when liquid level drops to bottom level instruction device in admission chamber, stops timing, obtains drawdown time ti, i represents that i & lt measures the cycle；
Step 4: calculate the permeability B of current measurement cyclei:
Wherein S0For the cavity cross-sectional area of admission chamber, ρ0For fluid density, g is acceleration of gravity, H is middle position level instruction device to the distance bottom exhaust chamber, h is bottom level instruction device to the distance bottom exhaust chamber, e is natural constant, γ is the viscosity of temperature required lower liquid, and δ is the thickness of porous material to be measured, and A is the cross-sectional area of porous material to be measured；
Step 5: repeat step 1 to step 4, after measurement cycle times reaches the times N of requirement, calculate the permeability of porous material to be measured
Beneficial effect
The invention have the benefit that
1, in admission chamber, lay three groups of level instruction devices, when liquid level meets or exceeds upside level instruction device height, stop liquid adds, temperature sensor can measure now temperature of liquid, control system can according in the dac value that returns of side and downside level instruction device carry out the measurement of time and complete automatic watering function, decrease human users, it is achieved detection and Automatic survey, and measurand only one of which, it is possible to efficiently reduce the introducing of error.
2, the water bath heat preservation chamber between inner core and urceolus, has functioned well as heat insulating effect, it is possible to make error be minimized when temperature survey.Porous material upper end admission chamber is provided with temperature sensor, real time temperature can be measured accurately, when temperature is lower than design temperature, the liquid being flowed into admission chamber by input duct is heated by control system in device environmental liquids container, making temperature can reach design temperature all the time, thus having accomplished to consider under coupled field, the permeance property of porous material being measured.
The additional aspect of the present invention and advantage will part provide in the following description, and part will become apparent from the description below, or is recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage are from conjunction with will be apparent from easy to understand the accompanying drawings below description to embodiment, wherein:
Fig. 1: the measuring device of multi-field coupling permeability for porous materials schematic diagram that the present invention proposes
In figure, 1 end cap, 2 urceolus, 3 water bath heat preservation chambeies, 4 inner cores, 5 porous materials to be measured, 6 sleeves, 7 sealing rings, 8 discharging tubes, 9 input duct, 10 temperature sensors, 11 the top level instruction devices, 12 middle position level instruction devices, 13 bottom level instruction devices, 14 soak cycles liquid inlets, 15 soak cycles liquid outlets.
Detailed description of the invention
Being described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of same or like function from start to finish.The embodiment described below with reference to accompanying drawing is illustrative of, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", " outward ", " clockwise ", orientation or the position relationship of the instruction such as " counterclockwise " are based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not considered as limiting the invention.
With reference to accompanying drawing 1, the measuring device of multi-field coupling permeability for porous materials in the present embodiment is for the permeability survey of spongy bone sample, and device includes urceolus 2, inner core 4, end cap 1.End cap 1 is double-layer vacuum polyethylene cover, and urceolus 2 is rustless steel urceolus, and inner core 4 is the square inner core of titanium alloy.The square inner tube installation of titanium alloy is in rustless steel urceolus, and inner core and urceolus are closed by double-layer vacuum polyethylene cover.
It is water bath heat preservation chamber 3 between the square inner core of titanium alloy and rustless steel urceolus, water bath heat preservation chamber 3 is by soak cycles liquid inlet 14 and soak cycles liquid outlet 15 and environmental liquids reservoir, soak cycles liquid inlet 14 and soak cycles liquid outlet 15 external diameter are 5mm, coordinate with rustless steel outer tube wall face seal.The effect of water bath heat preservation chamber is the dissipation to reduce heat of flowing by recirculated water, plays the effect of insulation, reduces measurement error.
It is a cavity inside the square inner core of titanium alloy, the square inner core inwall of titanium alloy has a stepped ramp type wall, length of side d=15mm, highly the cube carborundum porous ceramics porous material 5 to be measured for δ=10mm is placed on stepped ramp type wall, and the outside wall surface of porous material 5 to be measured and the square inner core internal face of titanium alloy closely cooperate；Square for titanium alloy interior tube inner chamber is divided into the admission chamber above porous material to be measured and the exhaust chamber below porous material to be measured by porous material 5 to be measured.
Admission chamber adopt titanium alloy square sleeve 6 compress porous material 5 to be measured, it is prevented that to make because of fluid pressure tested experiment material be moved, cause experimental error.Titanium alloy square sleeve 6 outside wall surface and inner core internal face closely cooperate, sleeve 6 lower end and porous material 5 upper end to be measured compression fit, and sleeve upper end is by sealing ring 7 and end cap compression fit.
Admission chamber connects by running through the input duct 9 of sleeve 6, inner core 4, water bath heat preservation chamber 3 and urceolus 2 with environmental liquids container；Input duct 9 external diameter is also 5mm, also seals with passed hole wall and coordinates.Connected by a discharging tube 8 sequentially passing through urceolus 2 and inner core 4 with the external world bottom exhaust chamber.Discharging tube 8 external diameter is also 5mm, seals with passed hole wall and coordinates.
Equipped with a temperature sensor 10 in admission chamber, using Siemens's SITRANSTF2 temperature sensor in this example, temperature sensor 10 can measure temperature of liquid in admission chamber.Also having on admission chamber internal face and be provided with three place's level instruction devices, level instruction device adopts the metal probe of horizontal positioned to realize, and metal probe is connected with external data acquisition control system.For controlling the external data acquisition control system employing STM32 single-chip microcomputer of automatic watering, liquid heating, measurement metal probe dac value in this example.
Utilize the device of this example, carry out the permeability survey method of carborundum porous ceramics plate sample, comprise the steps:
Step 1: the liquid in liquid container is heated to external world, when temperature reaches 30 degrees Celsius, Single-chip Controlling heating rod stops heating, enters step 2；When environmental liquids liquid in containers temperature is lower than design temperature 30 degree, Automatic control of single chip microcomputer heating rod restarts heating, until reaching temperature required；
Step 2: close the discharging tube of exhaust chamber, liquid in environmental liquids container is passed into admission chamber and incubation cavity respectively through input duct and soak cycles liquid inlet, in incubation cavity, liquid returns environmental liquids container from soak cycles liquid outlet, and the recirculated water in incubation cavity plays the insulation effect of liquid in inner core 4；When in admission chamber, liquid height reaches the top level instruction device, single-chip microcomputer detects the top level instruction device output signal change, automatically controls stopping and passing into liquid to admission chamber；Now adopting temperature measuring equipment to measure temperature of liquid in admission chamber, if the temperature of liquid recorded is lower than temperature required, then open discharging tube, all discharged by liquid in inner core, single-chip microcomputer does not carry out the measurement of liquid fall time, returns step 1；If the temperature of liquid recorded reaches temperature required, enter step 3；
Step 3: open discharging tube, liquid slowly flows out from discharging tube, when in admission chamber, liquid level drops to middle position level instruction device, single-chip microcomputer detects middle position level instruction device output signal change, starting timing, when in admission chamber, liquid level drops to bottom level instruction device, single-chip microcomputer detects bottom level instruction device output signal change, stop timing, obtain drawdown time ti, i represents that i & lt measures the cycle；
Step 4: calculate the permeability B of current measurement cyclei:
Wherein S0For the cavity cross-sectional area of admission chamber, ρ0For fluid density, g is acceleration of gravity, H is middle position level instruction device to the distance bottom exhaust chamber, h is bottom level instruction device to the distance bottom exhaust chamber, e is natural constant, γ is the viscosity of temperature required lower liquid, and δ is the thickness of porous material to be measured, and A is the cross-sectional area of porous material to be measured；
Step 5: repeat step 1 to step 4, after measurement cycle times reaches the times N of requirement, calculate the permeability of porous material to be measured
In the present embodiment, the cavity cross-sectional area S of admission chamber0=196 × 10-6m2, liquid adopts pure water, and middle position level instruction device is to the distance H=84.5mm bottom exhaust chamber, and bottom level instruction device is to the distance h=31mm bottom exhaust chamber, viscosity coefficient γ=0.8007 × 10 of 30 degrees Celsius of lower pure water-3PaS, thickness δ=10 × 10 of porous material to be measured-3M, the cross-sectional area A=d of porous material to be measured2=225 × 10-6m2。
Measure the cycle through 6 times, obtain
| Number of times | ti(s) | Bi(×10-11m2) |
| 1 | 92.73 | 0.767533 |
| 2 | 94.31 | 0.754674 |
| 3 | 90.89 | 0.783071 |
| 4 | 91.56 | 0.777341 |
| 5 | 92.33 | 0.770858 |
| 6 | 94.10 | 0.756358 |
Finally give the permeability of porous material to be measured
Although above it has been shown and described that embodiments of the invention, it is understandable that, above-described embodiment is illustrative of, being not considered as limiting the invention, above-described embodiment can be changed when without departing from principles of the invention and objective, revises, replace and modification by those of ordinary skill in the art within the scope of the invention.
Claims (4)
1. a measuring device of multi-field coupling permeability for porous materials, it is characterised in that: include urceolus, inner core, end cap；
Inner tube installation is in urceolus, and inner core and urceolus are closed by end cap；
Being incubation cavity between inner core and urceolus, incubation cavity is by soak cycles liquid inlet and soak cycles liquid outlet and environmental liquids reservoir；
Porous material to be measured is placed on the installation table top of inner core internal face, and the restrained structure in porous material upper end to be measured compresses；The outside wall surface of porous material to be measured and inner core internal face closely cooperate；Interior tube inner chamber is divided into the admission chamber above porous material to be measured and the exhaust chamber below porous material to be measured by porous material to be measured；
Admission chamber is connected by input duct with environmental liquids container；Having temperature measuring equipment to extend into sap cavity, temperature measuring equipment can measure temperature of liquid in admission chamber；Also having on admission chamber internal face and be provided with at least three place's level instruction devices, level instruction device is connected with external data acquisition control system；
Exhaust chamber is connected by discharging tube with the external world.
2. a kind of measuring device of multi-field coupling permeability for porous materials according to claim 1, it is characterised in that: described restraining structure adopts sleeve；Sleeve lower end and porous material upper end to be measured compression fit, sleeve upper end is by sealing ring and end cap compression fit；Sleeve outer wall face and inner core internal face closely cooperate.
3. a kind of measuring device of multi-field coupling permeability for porous materials according to claim 1, it is characterised in that: porous material to be measured is spongy bone sample.
4. utilize the method that the arbitrary described device of claim 1～3 carries out porous material multi-scenarios method permeability survey, it is characterised in that: comprise the following steps:
Step 1: the liquid in liquid container is heated to external world, when reaching temperature required, stops heating, enters step 2；When environmental liquids liquid in containers temperature is lower than, time temperature required, restarting heating, until reaching temperature required；
Step 2: close the discharging tube of exhaust chamber, respectively through input duct and soak cycles liquid inlet, the liquid in environmental liquids container is passed into admission chamber and incubation cavity, in incubation cavity, liquid returns environmental liquids container from soak cycles liquid outlet；When in admission chamber, liquid height meets or exceeds the top level instruction device, stop passing into liquid to admission chamber；Adopt temperature measuring equipment to measure temperature of liquid in admission chamber, if the temperature of liquid recorded is lower than temperature required, then open discharging tube, liquid in inner core is all discharged, return step 1；If the temperature of liquid recorded reaches temperature required, enter step 3；
Step 3: open discharging tube, when liquid level drops to middle position level instruction device in admission chamber, starts timing, when liquid level drops to bottom level instruction device in admission chamber, stops timing, obtains drawdown time ti, i represents that i & lt measures the cycle；
Step 4: calculate the permeability B of current measurement cyclei:
Wherein S0For the cavity cross-sectional area of admission chamber, ρ0For fluid density, g is acceleration of gravity, H is middle position level instruction device to the distance bottom exhaust chamber, h is bottom level instruction device to the distance bottom exhaust chamber, e is natural constant, γ is the viscosity of temperature required lower liquid, and δ is the thickness of porous material to be measured, and A is the cross-sectional area of porous material to be measured；
Step 5: repeat step 1 to step 4, after measurement cycle times reaches the times N of requirement, calculate the permeability of porous material to be measured
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112964623A (en) * | 2021-03-23 | 2021-06-15 | 哈尔滨工业大学 | Experimental device for axial permeation of annular tissue engineering scaffold and use method |
| CN116930042A (en) * | 2023-09-19 | 2023-10-24 | 常州建昊建筑鉴定检测有限公司 | Building waterproof material performance detection equipment and method |
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| CN116930042B (en) * | 2023-09-19 | 2023-12-01 | 常州建昊建筑鉴定检测有限公司 | Building waterproof material performance detection equipment and method |
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