CN206177778U - Penetrant unit of research porous medium whole area seepage flow mechanism - Google Patents
Penetrant unit of research porous medium whole area seepage flow mechanism Download PDFInfo
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- CN206177778U CN206177778U CN201621262887.2U CN201621262887U CN206177778U CN 206177778 U CN206177778 U CN 206177778U CN 201621262887 U CN201621262887 U CN 201621262887U CN 206177778 U CN206177778 U CN 206177778U
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Abstract
The utility model discloses a penetrant unit of research porous medium whole area seepage flow mechanism belongs to construction project technical field. The device includes supply tank, immersible pump, water pipe, tee bend, needle type valve, test device, stagnant water clamp, exhaust stack, differential pressure transmitter, computer and graduated flask etc. And circulating water supply system is formed to supply tank, immersible pump, water pipe, tee bend and needle type valve, can provide from low to the high water velocity that gradually changes for test device, still can practice thrift the water source simultaneously, adopting the differential pressure transmitter coupled computer water pressure difference at acquisition test device both ends in real time, and can guaranteeing the measuring range of its higher measurement accuracy and broad, the test device size can be according to the design by oneself of porous medium granule size. The utility model discloses can be used to study porous medium material's seepage flow mechanism and the regional division of each seepage flow, test device area is little, and process of the test safety is convenient, and the test result is reliable.
Description
Technical field
The utility model belongs to construction project technical field, is related to a kind of research region-wide seepage flow mechanism of porous media material
Permeability apparatus.
Background technology
Porous media refers to the solid polymer that many small interconnected pores are contained in a kind of inside, and Porous Media is
The problem of Study of Liquid flowing law in this solid dielectric.Porous Media theory has application, example in many aspects
Such as civil engineering, petroleum works, Aerospace Engineering, agriculture project and Chemical Engineering.Porous media material is widely present in
Nature, with special architectural feature, solid matter constitutes the skeleton of porous media, and skeleton specific surface area is larger, hole knot
Structure relative narrowness, is generally occupied by gas phase or liquid phase substance, and flow mechanism of the fluid in porous media can be with fluid stream
Speed change and change, Porous Media region be generally divided at present preceding darcy area, darcy area, transition region,
Forchheimer areas, transition region and turbulent area etc..
Laboratory test is to study the effective ways of Porous Media mechanism, for example, darcy traditional in Geotechnical Engineering is oozed
Stream experimental rig mainly has constant head permeameter (such as TST-70 types) and falling head permeameter (southern -55 types), some other darcy
Seepage tests instrument is also based on both instrument improvings and forms, by changing the method that percolation flow velocity forms different hydraulic gradients
To study the Percolation Law of porous media.Because the water velocity that such permeameter can be formed is little, so only office
It is limited to the darcy flow provincial characteristics of research porous media material, and porous media seepage is not only related to darcy flow,
Also include non-darcy area interstitial flow mechanism, it is therefore desirable to develop the novel permeation that can study the region-wide seepage flow mechanism of porous media
Device.
Utility model content
The utility model cannot study the deficiency in non-darcy flow region for conventional seepage flow test device, in existing darcy
It is improved on the basis of seepage apparatus, realizes that water velocity is gradually changed from small to large, and adopt automatically using differential pressure transmitter
Catchment pressure difference such that it is able to the seepage state of porous media is extended to non-darcy region from darcy region.
The technical solution of the utility model：
A kind of permeability apparatus for studying the region-wide seepage flow mechanism of porous media, the permeability apparatus includes supply tank 1, immersible pump
2nd, water pipe, threeway, needle-like valve, experimental rig, tongs 6, soaker 7, differential pressure transmitter 8, computer 9 and graduated cylinder 10；
The connecting water pipe of immersible pump 2 is simultaneously positioned in supply tank 1, the connection threeway of water pipe, and threeway one is connected by water pipe
Experimental rig, and the first needle-like valve 3-1 is set on water pipe, simultaneously be placed in for water pipe delivery port by the other connecting water pipe of threeway
Second needle-like valve 3-2 is set in water tank 1, on water pipe；Experimental rig delivery port is back in water tank 1 by water pipe, each connection
Carry out preventing water leakage measure in place；
Experimental rig includes water inlet cover plate 11, enters water breeze way 12, permeable orifice plate 13, dress sample section 14, water outlet breeze way
15 and water outlet velar plate 16, each part is attached by flange；The main body of experimental rig is the cylindrical shape of lucite material
Structure, its two ends are respectively mouth of a river cover plate 11 and water outlet velar plate 16；By two pieces of permeable orifice plates 13 by part in experimental rig
To enter water breeze way 12, middle dress sample section 14 and water outlet breeze way 15；Enter on water breeze way 12 and water outlet breeze way 15 respectively
Steam vent 4 is set, and steam vent 4 is connected by blast pipe with soaker 7, and tongs 6 is set on blast pipe；14 liang of dress sample section
End is respectively provided with pressure tap 5, and pressure tap 5 sets screen pack at the inwall of dress sample section 14, and pressure tap 5 passes through connecting pipe and difference
Pressure transmitter 8 is connected；Differential pressure transmitter 8 is connected by data wire with computer 9.
Described enters in water breeze way 12 and/or water outlet breeze way 15 plus gravel.
Described filter screen is 200 mesh.
The beneficial effects of the utility model：Fluid is extended to from low speed darcy area during this permeability apparatus can realize porous media
High velocity turbulent flow area, can be used for the division of the seepage flow mechanism and each the flow domain of studying porous media material；Using circulating water
System can be with saving water resource；Can be according to porous media granular size designed, designed test section size；Using differential pressure transmitter and meter
The data collecting system of calculation machine composition, it is ensured that certainty of measurement and measurement range wider higher.Experimental rig takes up an area face
Small, the process of the test safe ready of product, result of the test reliability.
Brief description of the drawings
Fig. 1 is system layout figure of the present utility model.
Fig. 2 is experimental rig profile of the present utility model.
Fig. 3 (a) is the cover plate front view in the utility model experimental rig.
Fig. 3 (b) is the cover plate left view in the utility model experimental rig.
Fig. 4 (a) is the breeze way front view in the utility model experimental rig.
Fig. 4 (b) is the breeze way upward view in the utility model experimental rig.
Fig. 4 (c) is the breeze way top view in the utility model experimental rig.
Fig. 5 (a) is the dress sample section front view in the utility model experimental rig.
Fig. 5 (b) is the dress sample section left view in the utility model experimental rig.
Fig. 5 (c) is the dress sample section right view in the utility model experimental rig.
Fig. 6 is the permeable orifice plate schematic diagram in the utility model experimental rig.
Fig. 7 is that the utility model Forchheimer the flow domains are divided.
In figure：1 supply tank；2 immersible pumps；3-1 the first needle-like valves；3-2 the second needle-like valves；4 steam vents；5 pressure taps；
6 tongses；7 soakers；8 differential pressure transmitters；9 computers；10 graduated cylinders；11 water inlet cover plates；12 enter water breeze way；13 permeable holes
Plate；14 dress sample sections；15 water outlet breeze ways；16 water outlet velar plates.
Specific embodiment
Specific embodiment of the present utility model is described in detail below in conjunction with technical scheme and accompanying drawing.
Embodiment
First, check and check
The first needle-like valve 3-1 will be kept fully closed, the second needle-like without immersible pump 2 is not crossed in steam distillation water injection water tank 1
Valve 3-2 standard-sized sheets, connect immersible pump 2 power check its whether normal work, inspection closes the power supply of immersible pump 2 after finishing.Successively
Water inlet cover plate 11 in joint test device, enter water breeze way 12, permeable orifice plate 13, the dress sample section 14, and of water outlet breeze way 15
Water outlet velar plate 16, each several part junction adds watertight rubber circle, and with spanner successively diagonal screwing screw, it is ensured that the He of steam vent 4
Pressure tap 5 is located on straight line, and finally experimental rig is connected with water pipe.The power supply of immersible pump 2 is connected, it is slow to open the first pin
Type valve 3-1 allows current overtesting device, and the air in experimental rig is excluded with soaker 7, checks and check differential pressure transmitter 8
Whether being capable of normal acquisition and record pressure difference data with computer 9.Immersible pump 2 and the electricity of differential pressure transmitter 8 are cut off in inspection after finishing
Source, and dismantle experimental rig.
2nd, experiment prepares
Connect water inlet cover plate 11 and enter water breeze way 12, enter filling glass ball in water breeze way 12；Connection dress sample
Section 14, the test material of drying is well mixed and claims its quality m1, according to every layer of 2~3cm high uniformity in dress sample section 14
Filling, weighs remaining test material quality m2, the porosity of porous media can be calculated by following formula,
In formula, d is the internal diameter for filling sample section 14, and L is the length for filling sample section 14, ρωIt is water density, dsIt is porous media material
Proportion；Connection water outlet breeze way 15 and water outlet velar plate 16, and the same filling glass ball in water outlet breeze way.Connect latent
The power supply of water pump 2, slow to open the first needle-like valve 3-1, slowly saturated sample, opens tongs 6 and is excluded with soaker 7 and test
The air of device internal residual.
3rd, test measurement and data processing
The first needle-like valve 3-1 to very little aperture is adjusted, after the water velocity stabilization of porous media to be passed through, computer is used
The 9 pressure difference Δ P for recording now porous media two ends；The current of water outlet in note certain hour t are surveyed with graduated cylinder 10 and stopwatch
Value V, is the percolation flow velocity u that can obtain flowing through porous media using following formula,
In formula, A is dress sample section cross-sectional area, and above unit uses international unit.
Coordinate the aperture of regulation the first needle-like valve 3-1 and the second needle-like valve 3-2, water velocity is gradually increased, weight
Multiple above-mentioned process of the test, obtains a series of corresponding hydraulic pressure difference under water velocities, you can draw seepage flow relation curve.
It is general the flow domain of porous media is divided using Forchheimer equations,
In formula, μ is liquid viscosity, and K is permeability, and F is Forchheimer constants, and ρ is fluid density.
Forchheimer equations are the quadratic terms that water velocity is increased on the basis of darcy flow equation (k=v/i)
u2, it is believed that with the increase of water velocity, Inertia (the i.e. u of fluid2) replacement viscosity term (u) slowly play a leading role, it is right
Forchheimer equations are modified slightly can obtain following formula,
Seepage flow relation curve is drawn using formula (4), it is as shown below,
When flow velocity is smaller, percolation curve is presented horizontal segment, represents that now porous media is in darcy flow region；With
Flow velocity slowly increases, and by after one section of transitional region, Δ P/Lu and the substantially linear relations of flow velocity u now can be with for percolation curve
Think that seepage state is in Forchheimer and flows area；Again by after one section of transition region, it is believed that seepage state enters turbulent flow
Area.Porous media when different porosities, different gradation curve, different porous media materials can be also studied using this device
Seepage flow mechanism.
Claims (3)
1. it is a kind of study the region-wide seepage flow mechanism of porous media permeability apparatus, it is characterised in that the permeability apparatus include supply water
Case (1), immersible pump (2), water pipe, threeway, needle-like valve, experimental rig, tongs (6), soaker (7), differential pressure transmitter
(8), computer (9) and graduated cylinder (10)；
Immersible pump (2) connecting water pipe is simultaneously positioned in supply tank (1), the connection threeway of water pipe, and threeway one is connected by water pipe
Experimental rig, and the first needle-like valve (3-1) is set on water pipe, the other connecting water pipe of threeway simultaneously puts water pipe delivery port
In water tank (1), the second needle-like valve (3-2) is set on water pipe；Experimental rig delivery port is back to water tank (1) by water pipe
In, preventing water leakage measure is carried out in each junction；
Experimental rig include water inlet cover plate (11), enter water breeze way (12), permeable orifice plate (13), dress sample section (14), water outlet delay
Section (15) and water outlet velar plate (16) are rushed, each part is attached by flange；The main body of experimental rig is lucite material
Cylinder-like structure, its two ends is respectively mouth of a river cover plate (11) and water outlet velar plate (16)；Will by two pieces of permeable orifice plates (13)
It is divided into inside experimental rig into water breeze way (12), middle dress sample section (14) and water outlet breeze way (15)；Enter water breeze way
(12) steam vent (4) and on water outlet breeze way (15) is respectively provided with, steam vent (4) is connected by blast pipe with soaker (7), and
Tongs (6) is set on blast pipe；Dress sample section (14) two ends are respectively provided with pressure tap (5), and pressure tap (5) is near dress sample section
(14) screen pack is set at inwall, and pressure tap (5) is connected by connecting pipe with differential pressure transmitter (8)；Differential pressure transmitter (8) leads to
Data wire is crossed to be connected with computer (9).
2. permeability apparatus according to claim 1, it is characterised in that described to enter water breeze way (12) and/or water outlet is slow
Rush in section (15) plus gravel.
3. permeability apparatus according to claim 1 and 2, it is characterised in that described filter screen is 200 mesh.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621262887.2U CN206177778U (en) | 2016-11-21 | 2016-11-21 | Penetrant unit of research porous medium whole area seepage flow mechanism |
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| CN201621262887.2U CN206177778U (en) | 2016-11-21 | 2016-11-21 | Penetrant unit of research porous medium whole area seepage flow mechanism |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706492A (en) * | 2016-11-21 | 2017-05-24 | 大连理工大学 | Penetration device for researching porous medium whole-zone penetration mechanism |
| CN108061698A (en) * | 2017-12-11 | 2018-05-22 | 叶剑红 | The full-automatic experimental rig and its method of measurement fluctuation current infiltration towing force coefficient |
| CN108226008A (en) * | 2018-01-18 | 2018-06-29 | 西安理工大学 | Self-loopa varying head darcy permeability test instrument |
-
2016
- 2016-11-21 CN CN201621262887.2U patent/CN206177778U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706492A (en) * | 2016-11-21 | 2017-05-24 | 大连理工大学 | Penetration device for researching porous medium whole-zone penetration mechanism |
| CN108061698A (en) * | 2017-12-11 | 2018-05-22 | 叶剑红 | The full-automatic experimental rig and its method of measurement fluctuation current infiltration towing force coefficient |
| CN108226008A (en) * | 2018-01-18 | 2018-06-29 | 西安理工大学 | Self-loopa varying head darcy permeability test instrument |
| CN108226008B (en) * | 2018-01-18 | 2020-12-18 | 西安理工大学 | Self-circulation variable water head Darcy infiltration experimental instrument |
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