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Device and method for observing vortex structure in porous medium transition flow

A technology of porous media and transitional flow, applied in measuring devices, testing of machines/structural components, fluid dynamics tests, etc., can solve problems such as large Reynolds number errors and poor flow stability of water pumps, and eliminate the influence of water flow pulsation , low device cost and high efficiency

Active Publication Date: 2022-01-04
ZHEJIANG UNIV
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Problems solved by technology

The common inflow mode of porous medium flow is pumping by frequency conversion pump, but the flow rate stability of the pump in low frequency working condition is poor, and the error of the correspondingly determined characteristic Reynolds number is relatively large

Method used

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  • Device and method for observing vortex structure in porous medium transition flow
  • Device and method for observing vortex structure in porous medium transition flow

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Embodiment Construction

[0026] Such as figure 1 Shown, the present invention adopts following technical scheme:

[0027] The devices for observing the vortex structure in the transitional flow of porous media can be divided into a water tank, a particle image acquisition system, the first conduit loop (to stabilize the pump outflow), the second conduit loop (to reduce air bubbles), and a reservoir, etc.

[0028] The water tank 7 is fixed by the fixed pier 3, and the porous medium 8 is placed on the support screen 4 in the middle of the water tank. The material of the water tank is the same as that of the porous medium to meet the requirements of matching refractive index. The pressure drop sensor 6 is placed in the front and back of the porous medium respectively through two sections of smooth pipe 5 to obtain the pressure drop information of the water flow in real time. The top 3 of the water tank 7 is connected back to the reservoir 16 through a T-shaped fork 18 and a regulating valve 17 .

[002...

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Abstract

The invention discloses a device and a method for observing a vortex structure in a porous medium transition flow. The device comprises a water tank, a particle image acquisition system, a first conduit loop, a second conduit loop and a reservoir. The water tank is fixed by fixing piers, and a porous medium is arranged on a supporting filter screen at the middle section of the water tank; pressure drop sensor ports are arranged at the upper end and the lower end of the water tank respectively and used for obtaining water flow pressure drop information in real time. An inlet of the first conduit loop is connected with a variable-frequency centrifugal water pump and used for eliminating water flow pulsation of the variable-frequency centrifugal water pump. An outlet of the second conduit loop is connected with the inflow end of the water tank, and water flow entrainment can be reduced through a steady flow filter screen and a flow guide plate. The device is ingenious in structure, good in integrity, high in efficiency and low in device cost; the quantitative relation between the characteristic Reynolds number and the pressure drop process can be established by acquiring the pressure drop information before and after the fluid flows through the porous medium in real time.

Description

technical field [0001] The invention relates to the field of hydrodynamic model tests, in particular to a device and method for observing a vortex structure in a porous medium transition flow. Background technique [0002] Flow in porous media has received increasing attention in various disciplines. Such as groundwater flow, solute transport in biological tissues, fiberboard manufacturing, composite material manufacturing, subsurface diffusion of chemical waste, gas propagation in fuel cells, enhanced recovery of petroleum reservoirs, chromatography columns, filtration systems, chemical catalytic reactors, etc. . Contrary to the common view that low-velocity flow predominates in porous media, inertial effects play an important role in modifying hydrodynamic processes. In other words, depending on whether an unstable chaotic process occurs in a porous medium, the flow state can be laminar or turbulent. The study of transitional flow in porous media is the key to understand...

Claims

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Application Information

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IPC IPC(8): G01M10/00
CPCG01M10/00Y02E30/30
Inventor 林颖典韩东睿贺治国何梦星谢晓云姜书
Owner ZHEJIANG UNIV
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