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EXPERIMENTAL STUDY OF microscale flow FOR MICRO MOLECULE LIQUID AND POLYMER SOLUTION

Journal of Hydrodynamics 2005年第3期17卷 352-357页

作者： LIUZhong-chun YUEXiang-an HOUJi-rui ZHANGLi-juan SchoolofEnergyResources ChinaUniversityofGeoscienceBeijing100083China／／SINOPECExplorationandproductionResearchInstituteBeijing100083China EORcenter ChinaUniversityofPetroleumBeijing102249China

The flow performances of water, white oil and Hydrolyzing Polyacrylamide (HPAM) solution in fused quartz channels and the effect of wettability on the microscale flows have been studied respectively in this paper. The adaptability of classical fluid mechanics in channels with different sizes has been discussed. The results show that water flows in channels of 2μm diameter also have few size effects and white oil flow accord with classical fluid mechanics theory in channels of 25μm diameter too, but polymer solution appears an obvious size effect as diameters of channels decrease to 16μm. The wettability does not produce any influences on the water or white oil flows in channels of 25μm or 50μm diameter. The experimental technology of microscale flows has been first applied for studying the flow performances of pores in low permeability reservoir. This study found a base for deep investigating the percolation mechanism in low permeability reservoirs.

关键词： microscale flow wettability micro molecule liquid polymer solution reservoir pores low permeability

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Analytical method of nonlinear coupled constitutive relations for rarefied non-equilibrium flows

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Chinese Journal of Aeronautics 2021年第2期34卷 136-153页

作者： Zhiqiang HE Zhongzheng JIANG Huangwei ZHANG Weifang CHEN School of Aeronautics and Astronautics Zhejiang UniversityHangzhou 310027China Department of Mechanical Engineering National University of SingaporeSingapore 117576Singapore

It is well known that Navier-Stokes equations are not valid for those high-Knudsen and high-Mach flows, in which the local thermodynamically non-equilibrium effects are dominant. To extend the non-equilibrium describing the ability of macroscopic equations, Nonlinear Coupled Constitutive Relation(NCCR) model was developed from Eu’s generalized hydrodynamic equations to substitute linear Newton’s law of viscosity and Fourier’s law of heat conduction in conservation laws. In the NCCR model, how to solve the decomposed constitutive equations with reasonable computational cost is a key ingredient of this scheme. In this paper, an analytic method is proposed firstly. Compared to the iterative procedure in the conventional NCCR model, the analytic method not only obtains exact roots of the decomposed constitutive polynomials, but also preserves the nonlinear constitutive relations in the original framework of NCCR methods. Numerical tests to assess the efficiency and accuracy of the proposed method are conducted for argon shock structures, Couette flows, two-dimensional hypersonic flows over a cylinder and threedimensional supersonic flows over a three-dimensional sphere. These superior advantages of the current method are expected to render itself a powerful tool for simulating the hypersonic rarefied flows and microscale flows of high Knudsen number for engineering applications.

关键词： Knudsen number microscale flow Non-equilibrium Nonlinear constitutive relations Rarefied gas

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Experimental study on visualization of the flow field in microtube

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Science China Technological Sciences 2005年第5期 43-51页

作者： LIU Zhigang & ZHAO Yaohua Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China

An experimental study was conducted to visualize the flow field and confirm the transitional Reynolds number from laminar to turbulent flow, as distilled water flows through quartz glass microtubes with inner diameter 315 and 520 μm. With gentian violet as colorant, the flow field pictures in the microtube, and therefore, is shot by a CCD camera with a microscope at different Reynolds numbers. Pressure drop data were also used to characterize the friction factor for those microtubes in the Reynolds number range of 200―2300. The experimental results clearly showed that the flow in the microtube was the laminar state and the friction factors agreed well with the Poiseuille equations when the Reynolds number was low. As the Reynolds number was larger than 1200 and 1500 for the microtube with inner diameter 315 and 520 μm, respectively, the friction factor departed from the classical laminar solution due to the earlier transition from laminar to turbulent flow. The flow turned into full turbulent when the Reynolds number reached 1500―1800.

关键词： visual experiment microtube microscale flow friction factor turbulent transition.

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