CN113567311A - Device and method for testing sedimentation velocity in irregular-form particle liquid - Google Patents
Device and method for testing sedimentation velocity in irregular-form particle liquid Download PDFInfo
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- CN113567311A CN113567311A CN202110659101.XA CN202110659101A CN113567311A CN 113567311 A CN113567311 A CN 113567311A CN 202110659101 A CN202110659101 A CN 202110659101A CN 113567311 A CN113567311 A CN 113567311A
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- 239000002245 particle Substances 0.000 title claims abstract description 68
- 239000007788 liquid Substances 0.000 title claims abstract description 57
- 238000012360 testing method Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004062 sedimentation Methods 0.000 title claims abstract description 24
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 136
- 239000007864 aqueous solution Substances 0.000 claims abstract description 39
- 238000003860 storage Methods 0.000 claims abstract description 34
- 235000011187 glycerol Nutrition 0.000 claims description 44
- 230000001788 irregular Effects 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 13
- 239000008187 granular material Substances 0.000 claims description 10
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 7
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 7
- 241001330002 Bambuseae Species 0.000 claims description 7
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 7
- 239000011425 bamboo Substances 0.000 claims description 7
- 239000011550 stock solution Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000013589 supplement Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000000917 particle-image velocimetry Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000700 radioactive tracer Substances 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- G01N15/04—Investigating sedimentation of particle suspensions
Abstract
The invention provides a device and a method for testing the sedimentation velocity in irregular-shaped particle liquid, which comprises a constant temperature box (5), wherein a cylindrical liquid storage cylinder (2) is arranged in the constant temperature box (5), glycerol aqueous solutions (1) with different volume concentrations are configured in the cylindrical liquid storage cylinder (2), an electromagnetic clamping piece (3) device is arranged at the upper part of the cylindrical liquid storage cylinder (2), the electromagnetic clamping piece (3) device can be used for loading irregular-shaped particles (10), and a non-contact type measuring system is arranged on the inner wall of the constant temperature box (5). According to the invention, different viscous forces of liquid are simulated by configuring glycerol aqueous solutions with different volume fractions, so that the Reynolds number of particles in a wide area interval range is simulated, and meanwhile, test errors caused by external temperature environment and artificial release factors of the particles are solved.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering and engineering geology, in particular to a device and a method for testing the sedimentation velocity in irregular-shaped particle liquid.
Background
Irregular geotechnical body particle substances are commonly used geotechnical materials in engineering (such as south sea island reef filling, high dam construction and the like), and the permeability of the materials largely determines the consolidation and settlement of a foundation or the seepage characteristics of an engineering structure. The drag coefficient is a main parameter for representing the surface force of the fluid on the soil particles and is also a key parameter in the fluid-solid coupling numerical simulation, but the current research on the drag coefficient of irregular particles at home and abroad is very limited.
The chinese utility model patent CN208313762U discloses an image acquisition system for sediment particle sedimentation process, which provides a method for solving the problems of insufficient polishing and polishing deviation; the chinese invention patent CN109946205A discloses a method for testing the sedimentation drag coefficient of drill cutting particles, but still does not effectively solve the technical difficulty that the particles automatically fall vertically in the liquid.
In summary, the presently disclosed method for testing the final settling velocity in the granular liquid still does not effectively solve the technical problems of natural falling of the granules, measurement of velocity field and the like, and does not find a method for measuring the settling velocity of the granules in irregular shapes, nor a method for measuring the final settling velocity of the granules considering reynolds numbers of different granules, and in addition, because the environmental temperature has a certain influence on the settling velocity of the granules, the problem of constant temperature environment in the testing process cannot be ignored in order to ensure the testing precision.
Disclosure of Invention
In view of the shortcomings in the prior art, the first object of the present invention is to provide a device for testing the sedimentation velocity of irregular-shaped particle liquid. According to the invention, different viscous forces of liquid are simulated by configuring glycerol aqueous solutions with different volume fractions, so that the Reynolds number of particles in a wide area interval range is simulated, and meanwhile, test errors caused by external temperature environment and artificial release factors of the particles are solved.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a device and a method for testing the sedimentation velocity in irregular granular liquid are characterized in that: including the thermostated container, set up cylindrical stock solution section of thick bamboo in the thermostated container, the glycerine aqueous solution of the different volume concentration of configuration in the cylindrical stock solution section of thick bamboo, cylindrical stock solution section of thick bamboo sets up electromagnetic clamping piece equipment on upper portion, and electromagnetic clamping piece equipment can load irregular form granule, set up non-contact's measurement system on the inner wall of thermostated container.
Further: the electromagnetic clamping piece equipment comprises two electromagnetic clamping pieces arranged on the upper portion of the cylindrical liquid storage cylinder, irregular-shaped particles can be loaded between the two electromagnetic clamping pieces, and the two electromagnetic clamping pieces are externally connected with a power supply box.
Further: an LED light supplement lamp is arranged in the incubator, the temperature adjusting range of the incubator is 4-30 ℃, and the minimum adjusting quantity is 1 ℃.
Further: two the electromagnetism clamping piece loads in on a platform, and the platform is arranged in the top of cylindrical liquid storage cylinder, and two electromagnetism clamping pieces can move about on the platform.
Further: the non-contact type measuring system comprises a first industrial camera and a second industrial camera, wherein the first industrial camera and the second industrial camera are arranged up and down on the inner wall of the incubator, and cameras of the first industrial camera and the second industrial camera are opposite to the cylindrical liquid storage cylinder.
Further: the non-contact type measuring system comprises a laser instrument, wherein the laser instrument is positioned on the inner wall of the incubator, and the arrangement position can ensure that a laser section can just penetrate through the section where irregular-shaped particles are positioned.
Further: the cylindrical liquid storage cylinder is made of organic glass materials.
The invention aims to provide a method for testing the sedimentation velocity in irregular granular liquid, which adopts the following technical scheme: the testing device is manufactured firstly, and the testing device adopts the following steps:
s1, preparing a glycerol aqueous solution in the cylindrical liquid storage cylinder, injecting the glycerol aqueous solution along the wall of the cylindrical liquid storage cylinder, and filling the cylindrical liquid storage cylinder;
s2, loading the irregular-shaped particles between the two electromagnetic clamping pieces, adjusting the current output by the power supply box to enable the clamping force of the two electromagnetic clamping pieces to completely clamp the irregular-shaped particles, and standing the irregular-shaped particles in the glycerol aqueous solution prepared in the step S1;
s3, setting the temperature in the constant temperature box to be 4-30 ℃, and standing the testing device for 12 hours;
s4, after the testing device stands for 12 hours, opening a laser instrument, a first industrial camera and a second industrial camera of the non-contact measurement acquisition system to prepare for data acquisition;
s5, closing the power supply box to enable the irregular-shaped particles to automatically fall freely in the glycerol aqueous solution, and acquiring data by the non-contact measurement and acquisition system when the irregular-shaped particles fall;
and S6, completing data acquisition, reconfiguring glycerol aqueous solutions with different volume fractions in the cylindrical liquid storage cylinder, and repeating the steps S2-S5 until the tests of all the glycerol aqueous solutions with different volume fraction ratios are completed.
Further: the proportioning principle of the glycerol aqueous solution is as follows: the interval of the volume ratio of the glycerol to the water in the glycerol aqueous solution is 60-100%, and from the mixture ratio of 60%, a glycerol aqueous solution is prepared by increasing the volume of the glycerol by 5%.
Compared with the prior art, the invention has the following advantages and beneficial effects:
aiming at the problems that the initial velocity cannot return to zero, the temperature of a test environment is unstable and data acquisition is difficult in the current measurement of the final sedimentation velocity in the granular water, different viscous forces of liquid are simulated by configuring glycerol aqueous solutions with different volume fractions, the Reynolds number of the granules in a wide area interval range is simulated, test data are acquired by configuring a non-contact measurement system, and test errors caused by external temperature environment and artificial release factors of the granules are solved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a flow chart of the method of the present invention.
Reference numerals: 1-aqueous glycerol solution; 2-a cylindrical liquid storage cylinder; 3-an electromagnetic clip; 4-a power supply box; 5-a constant temperature box; 6-a first industrial camera; 7-a second industrial camera; 8-LED light supplement lamps; 9-a laser; 10-irregularly shaped particles; 11-platform.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
As shown in fig. 1 to 2, a device and a method for testing a settling velocity in an irregular particle 10 liquid includes a thermostat 5, the thermostat 5 can maintain a constant temperature of a test environment, and eliminate an influence of a temperature condition on a settling velocity of a regular particle, a cylindrical liquid storage cylinder 2 is arranged in the thermostat 5, glycerol aqueous solutions 1 with different volume concentrations are arranged in the cylindrical liquid storage cylinder 2, and the glycerol aqueous solutions 1 with different volume concentrations are arranged to simulate viscosity coefficients of different fluids, so as to obtain a wide particle reynolds number interval, the particle reynolds number interval range is about 0.01 to 1000, an electromagnetic clamping piece 3 device is arranged at the upper part of the cylindrical liquid storage cylinder 2, the electromagnetic clamping piece 3 device can load the irregular particle 10, and a non-contact measurement system is arranged on an inner wall of the thermostat 5.
The electromagnetic clamping piece 3 equipment comprises two electromagnetic clamping pieces 3 arranged on the upper portion of the cylindrical liquid storage cylinder 2, irregular-shaped particles 10 can be loaded between the two electromagnetic clamping pieces 3, the two electromagnetic clamping pieces 3 are externally connected with a power supply box 4, the power supply box 4 is fixed on the inner wall of the constant temperature box 5, the power supply box 4 is a 36V power supply box 4, and a power supply adjusting button is installed on the shell of the constant temperature box 5.
An LED light supplement lamp is arranged in the thermostat 5, provides light supplement for the thermostat 5, is arranged at the top of the thermostat 5, and needs to meet the requirement of an image measurement method on brightness, a 60-watt incandescent lamp is generally selected, the temperature regulation range of the thermostat 5 is 4-30 ℃, and the minimum regulation quantity is 1 ℃. The inner space of the thermostat 5 can meet the requirement of loading all test equipment, and the length of the thermostat 5 is 1000mm, the width of the thermostat is 1000mm, and the height of the thermostat is 1800 mm.
Two the electromagnetism clamping piece 3 loads on a platform 11, and cylindrical liquid storage cylinder 2's top is arranged in to platform 11, and two electromagnetism clamping pieces 3 are formed by the iron sheet preparation, are cylindricly to the processing screw thread. Set up a width and the same bar groove of cylindrical electromagnetism clamping piece 3 diameter on platform 11, electromagnetism clamping piece 3 loads on platform 11 back, screws up the nut at platform 11 upper and lower both ends respectively, guarantees that electromagnetism clamping piece 3 can not reciprocate on platform 11. When the electromagnetic clamping piece 3 needs to be moved left and right, only the nut positioned below the platform 11 needs to be loosened, and after the nut is moved to a preset position, the nut is screwed up and fixed.
The non-contact measuring system comprises a first industrial camera 6 and a second industrial camera 7, wherein the first industrial camera 6 and the second industrial camera 7 are arranged up and down on the inner wall of the incubator 5, the distance between the first industrial camera 6 and the second industrial camera 7 is 500mm, and the cameras of the first industrial camera 6 and the second industrial camera 7 are opposite to the cylindrical liquid storage cylinder 2.
The non-contact measuring system further comprises a laser instrument 9, wherein the laser instrument 9 is positioned on the inner wall of the incubator 5, and the arrangement position can ensure that a laser section can just penetrate through the section where the irregular-shaped particles 10 are located. The laser instrument 9 provides a laser profile for particle image velocimetry measurement.
The cylindrical liquid storage cylinder 2 is made of organic glass materials and can ensure certain light transmission. The inner diameter of the cylindrical liquid storage cylinder 2 is 500mm, the height of the cylindrical liquid storage cylinder is 1500mm, and the cylindrical liquid storage cylinder 2 can provide enough space for the irregular particles 10 to reach stable sedimentation speed.
In summary, the method for testing the sedimentation velocity of the irregular-shaped particles 10 in the liquid provided by the invention comprises the following steps: firstly, manufacturing the testing device;
s1, glycerol aqueous solution 1 is arranged in the cylindrical liquid storage cylinder 2, the glycerol aqueous solution 1 is injected along the cylinder wall of the cylindrical liquid storage cylinder 2 and fills the cylindrical liquid storage cylinder 2, so that the glycerol aqueous solution 1 can submerge the irregular-shaped particles 10;
s2, loading the irregular-shaped particles 10 between the two electromagnetic clamping pieces 3, and adjusting the current output by the power supply box 4 to ensure that the clamping force of the two electromagnetic clamping pieces 3 can completely clamp the irregular-shaped particles 10, and standing the irregular-shaped particles 10 in the glycerol aqueous solution 1 prepared in the step S1;
s3, setting a constant temperature in the constant temperature box 5, wherein the constant temperature is 4-30 ℃, and standing the testing device for 12 hours;
s4, after the testing device stands for 12 hours, opening a laser instrument 9, a first industrial camera 6 and a second industrial camera 7 of the non-contact measurement and acquisition system to prepare for data acquisition;
s5, closing the power supply box 4 to enable the irregular-shaped particles 10 to automatically fall freely in the glycerol aqueous solution 1, and collecting data by a non-contact measurement and collection system when the irregular-shaped particles 10 fall;
and S6, completing data acquisition, reconfiguring glycerol aqueous solution 1 with different volume fractions in the cylindrical liquid storage cylinder 2, and repeating the steps S2-S5 until the tests of all glycerol aqueous solution 1 with different volume fraction ratios are completed.
The proportioning principle of the glycerol aqueous solution 1 is as follows: the volume ratio of the glycerol to the water in the glycerol aqueous solution 1 is 60-100%, and from the mixture ratio of 60%, every 5% of the volume of the glycerol is added to prepare the glycerol aqueous solution 1.
The current output by the power supply box 4 is adjusted, so that the electromagnetic force between the electromagnetic clamping pieces 3 is changed, and then the particles 10 with irregular shapes begin to settle to the lower part of the cylindrical liquid storage cylinder 2 by means of the dead weight of the particles with irregular shapes, errors caused by the initial speed caused by artificial release of the particles with irregular shapes 10 are overcome, and the interference caused by artificial release of the particles with irregular shapes 10 is avoided.
The sedimentation velocity of the irregular-shaped particles 10 and the flow field near the particles can be jointly measured by adopting a particle image velocimetry method and a close-range photogrammetry method, the quantitative relation of a measured object between a space coordinate system and a photo coordinate system can be calibrated based on the close-range photogrammetry method, the sedimentation velocity of the particles is obtained, and the change of the flow field near the irregular-shaped particles 10 can be obtained based on the particle image velocimetry method; the settling velocity of the irregularly-shaped particles 10 can be obtained as follows:
1. the close-range photogrammetry method is to adopt a first industrial camera 6 and a second industrial camera 7 to photograph the same measured object (namely irregular-shaped particles 10) to obtain the photo coordinates of the irregular-shaped particles 10 in the first industrial camera 6 and the second industrial camera 7 at the same moment, and inversely calculate the space coordinates of the irregular-shaped particles 10 at the moment based on the close-range photogrammetry method. The first industrial camera 6 and the second industrial camera 7 can obtain the spatial coordinates of the irregular-shaped particle 10 at a plurality of moments, and further can obtain the speed of the irregular-shaped particle 10 by dividing the coordinate difference by the time difference.
2. The particle image velocimetry is that reflective tracer particles are uniformly distributed in a glycerol aqueous solution 1, a laser instrument 9 emits a laser beam passing through the periphery of irregular particles 10, and the positions of the tracer particles in the glycerol aqueous solution 1 at different times are analyzed based on the particle image velocimetry to obtain the flow field change near the particles.
According to the present invention and the accompanying drawings, those skilled in the art can easily make or use the apparatus and method for testing the sedimentation velocity in the irregularly-shaped particle liquid of the present invention, and can produce the positive effects described in the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (9)
1. The utility model provides a testing arrangement of sedimentation velocity in irregular form granule liquid which characterized in that: including thermostated container (5), set up cylindrical stock solution section of thick bamboo (2) in thermostated container (5), configuration glycerine aqueous solution (1) in cylindrical stock solution section of thick bamboo (2) section of thick bamboo, cylindrical stock solution section of thick bamboo (2) set up electromagnetic clamping piece (3) equipment in the upper portion, and electromagnetic clamping piece (3) equipment can load irregular form granule (10), set up non-contact's measurement system on the inner wall of thermostated container (5).
2. The apparatus for testing the sedimentation velocity in irregularly shaped granular liquid according to claim 1, wherein: the electromagnetic clamping piece (3) equipment comprises two electromagnetic clamping pieces (3) arranged on the upper portion of the cylindrical liquid storage cylinder (2), irregular-shaped particles (10) can be loaded between the two electromagnetic clamping pieces (3), and the two electromagnetic clamping pieces (3) are externally connected with a power supply box (4).
3. The apparatus for testing the sedimentation velocity in irregularly shaped granular liquid according to claim 1, wherein: an LED light supplement lamp is arranged in the thermostat (5), the temperature adjusting range of the thermostat (5) is 4-30 ℃, and the minimum adjusting quantity is 1 ℃.
4. The apparatus for testing the sedimentation velocity in irregularly shaped granular liquid according to claim 2, wherein: the two electromagnetic clamping pieces (3) are loaded on a platform (11), the platform (11) is arranged above the cylindrical liquid storage barrel (2), and the two electromagnetic clamping pieces (3) can move left and right on the platform (11).
5. The apparatus for testing the sedimentation velocity in irregularly shaped granular liquid according to claim 1, wherein: the non-contact measuring system comprises a first industrial camera (6) and a second industrial camera (7), wherein the first industrial camera (6) and the second industrial camera (7) are arranged up and down on the inner wall of the incubator (5), and cameras of the first industrial camera (6) and the second industrial camera (7) are opposite to the cylindrical liquid storage cylinder (2).
6. The apparatus for testing the sedimentation velocity in irregularly shaped granular liquid according to claim 1, wherein: the non-contact type measuring system comprises a laser instrument (9), wherein the laser instrument (9) is positioned on the inner wall of the constant temperature box (5), and the arrangement position can ensure that a laser section can just penetrate through the section where the irregular particles (10) are located.
7. The apparatus for testing the sedimentation velocity in irregularly shaped granular liquid according to claim 1, wherein: the cylindrical liquid storage cylinder (2) is made of organic glass materials.
8. A method of measuring sedimentation velocity in a fluid containing irregularly shaped particles, the method comprising the steps of:
s1, glycerol aqueous solution (1) is arranged in the cylindrical liquid storage cylinder (2), and the glycerol aqueous solution (1) is injected along the cylinder wall of the cylindrical liquid storage cylinder (2) to enable the glycerol aqueous solution (1) to submerge the irregular particles (10);
s2, loading the irregular-shaped particles (10) between the two electromagnetic clamping pieces (3), and adjusting the current output by the power supply box (4) to enable the clamping force of the two electromagnetic clamping pieces (3) to completely clamp the irregular-shaped particles (10), and standing the irregular-shaped particles (10) in the glycerol aqueous solution (1) prepared in the step S1;
s3, setting a constant temperature in the constant temperature box (5), wherein the constant temperature is 4-30 ℃, and standing the testing device for 12 hours;
s4, after the testing device stands for 12 hours, opening a laser instrument (9), a first industrial camera (6) and a second industrial camera (7) of the non-contact type measurement and acquisition system to prepare for acquiring data;
s5, closing the power supply box (4) to enable the irregular-shaped particles to automatically fall freely in the glycerol aqueous solution (1), and acquiring data by the non-contact measurement and acquisition system when the irregular-shaped particles fall;
s6, completing data acquisition, reconfiguring the glycerol aqueous solution (1) with different volume fractions in the cylindrical liquid storage cylinder (2), and repeating the steps S2-S5 until the glycerol aqueous solution tests with different volume fraction ratios are completed.
9. The method for testing the sedimentation velocity in a liquid containing irregularly-shaped particles according to claim 8, wherein the method comprises the following steps: the proportioning principle of the glycerol aqueous solution (1) is as follows: the range of the volume ratio of the glycerol to the water in the glycerol aqueous solution (1) is 60-100%, and the glycerol aqueous solution (1) is prepared by adding 5% of the volume of the glycerol from the 60% of the mixture ratio.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114608989A (en) * | 2022-05-16 | 2022-06-10 | 华南农业大学 | Soil mechanical composition on-line measuring device and method based on gravity detection |
| CN114609005A (en) * | 2022-05-16 | 2022-06-10 | 华南农业大学 | Soil mechanical composition on-line measuring device and method based on pressure detection |
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| CN208653979U (en) * | 2018-11-06 | 2019-03-26 | 河海大学 | The device of particle synchronous release in a kind of particle sedimentation experiment |
| CN112304825A (en) * | 2020-11-27 | 2021-02-02 | 中国石油大学(北京) | Device and method for measuring particle settling velocity in supercritical carbon dioxide |
| CN216013072U (en) * | 2021-06-15 | 2022-03-11 | 中国电建集团华东勘测设计研究院有限公司 | Testing arrangement of sedimentation velocity in irregular form granule liquid |
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- 2021-06-15 CN CN202110659101.XA patent/CN113567311A/en active Pending
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| US3679367A (en) * | 1970-09-14 | 1972-07-25 | Technicon Instr | Apparatus for determining the pack volume of particulates in liquid mixtures |
| CN109307648A (en) * | 2018-08-24 | 2019-02-05 | 南京航空航天大学 | A kind of sedimentation experiment method measuring irregular particle resistance coefficient under particular pose angle |
| CN208653979U (en) * | 2018-11-06 | 2019-03-26 | 河海大学 | The device of particle synchronous release in a kind of particle sedimentation experiment |
| CN112304825A (en) * | 2020-11-27 | 2021-02-02 | 中国石油大学(北京) | Device and method for measuring particle settling velocity in supercritical carbon dioxide |
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| CN114609005A (en) * | 2022-05-16 | 2022-06-10 | 华南农业大学 | Soil mechanical composition on-line measuring device and method based on pressure detection |
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