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A Particle Annular Couette Shear Flow Experimental Device

An experimental device and shear flow technology, applied in the direction of measurement device, flow characteristics, indirect flow characteristics measurement, etc., can solve the problems of poor reliability of simulation results and only have reference significance, and achieve rich particle flow characteristics and precise velocity control , the effect of high experimental precision

Active Publication Date: 2021-01-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Numerical simulation and experimental methods can be used to study particle flow characteristics. Because numerical simulation methods sometimes introduce simplified formulas and empirical formulas in calculations, the reliability of simulation results is poor. Sometimes the results of numerical simulation can only be of reference significance in actual engineering. Simulation The accuracy of the results still needs to be verified experimentally
The current experimental device cannot meet the requirements, and a corresponding experimental device needs to be manufactured

Method used

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  • A Particle Annular Couette Shear Flow Experimental Device
  • A Particle Annular Couette Shear Flow Experimental Device
  • A Particle Annular Couette Shear Flow Experimental Device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A transparent glass ball with a diameter of Φ1mm is selected as the particle medium, and a thin layer of black coating is sprayed on a part of the particle surface as a tracer particle. During the experiment, the tracer particles are closely arranged on the surface of the granular medium along the radial direction of the outer cylinder 3, and the frequency conversion motor 8 and the high-speed camera are started to shoot the flow process of the tracer particles with the granular medium. The experimental results are shown in Figure 5, as can be seen, as As shown in Figure 5(a), the tracer particles are closely arranged on the surface of the granular medium along the radial direction of the outer cylinder 3 at the initial moment, and as time increases, as shown in Figure 5(b), the tracer particles form a line on the surface of the granular medium The curved arc curve, the tracer particles at the end of the curve can be regarded as the position of the boundary of the shear ...

Embodiment 2

[0028] A transparent glass ball with a diameter of Φ1mm is selected as the particle medium, and a black hollow iron ball with a diameter of Φ25mm and a wall thickness of 1mm is used as the tracer particle. The surface of the hollow iron ball has a through hole with a diameter of Φ4mm, which is used to drop steel balls to change Hollow iron ball weight. During the experiment, the hollow iron ball was pressed into the granular medium through the positioning device, the guide cylinder 21 was installed at the through hole 23, and the pressing rod 20 was inserted into the guide cylinder 21 to press the hollow iron ball into the outer shell. In the granular medium in cylinder 3. Start the frequency conversion motor 8 and the high-speed camera to photograph the process of the hollow iron ball floating on the surface of the particle flow. The experimental results are as follows: Figure 6 As shown, it can be seen that the hollow iron ball has just floated up from the inside of the pa...

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Abstract

The invention relates to a particle annular Couette shear flow experiment device. The technical solution is: including the casing, support rods, beams, shearing chamber, frequency conversion motor and transmission mechanism, the shearing chamber includes a chassis, an inner cylinder and an outer cylinder, the inner cylinder and the outer cylinder are coaxially arranged, and the inner cylinder One end of the cylinder is fastened coaxially with the chassis, there is a gap between the chassis and the outer cylinder, the other end of the inner cylinder is tightly connected with the beam, and the support rod is tightly connected with the beam and the upper cover of the casing; the transmission mechanism includes The slewing disk, the slewing support bearing, the driving shaft and the worm gear reducer, the outer cylinder and the slewing disk are coaxially fastened, the slewing disk is coaxially fastened with the inner ring of the slewing support bearing, the outer ring of the slewing support bearing is connected with the machine The upper cover plate of the shell is tightly connected, one end of the drive shaft is coaxially connected with the turntable, the other end of the drive shaft is coaxially connected with the output shaft of the worm gear reducer, and the frequency conversion motor is coaxially connected with the input shaft of the worm gear reducer. The experimental device of the invention has rich particle flow characteristics and high experimental precision.

Description

technical field [0001] The invention belongs to the technical field of engineering test devices, in particular to a particle annular Couette shear flow test device. Background technique [0002] Particle flow generally refers to the movement state of granular materials similar to flow under the action of external force and internal stress. The phenomenon of particle flow exists widely in nature and industrial processes, such as landslides, debris flows, grain processing and pharmaceutical production. In order to study the particle flow characteristics, a continuous particle flow model needs to be established. The annular Couette particle flow is to confine the particles in two coaxial cylinders, and the particles will flow through the rotation of the inner cylinder and the outer cylinder; the circular Couette particle flow about the rotation of the inner cylinder, due to the inner The diameter of the cylinder is relatively small, resulting in a narrow particle flow area. So...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/00G01N11/00
CPCG01N11/00G01N15/00G01N2011/008
Inventor 费洪柱李健白剑
Owner NORTHEASTERN UNIV LIAONING
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