To investigate inflow fields in Micro-channel at Reynolds number lower than 1,such as inflow in vascular plant,with micro-fluidic particle image velocimetry(Micro-PIV) technique and numerical simulation that simulating wall roughness elements by setting up porous medium thickness and momentum source of porous medium model in software Fluent,inflow fields in straight micro-channels with cross section of 400 μm×400 μm under the conditions of the Reynolds number of 0.15,0.25 and 0.35 were obtained respectively.The velocity distributions were compared with analytical solution adopted by solving governing equations directly.The result shows that effect from wall roughness on the velocity distributions is small but not ignorable in micro-channel,so the analytical solution cannot meet the experimental results.The profile has the same tendency,but the value is lower in the mean flow area,which is distant from horizontal axis less than 0.04 mm,and higher in other region near the wall.Velocity distributions derived by the numerical simulation meet the experimental results well,so this numerical simulation can be successfully used in handling inflow problems at low Reynolds number in square section straight micro-channel.
HE Wen-Bo, Wang-Yuan, Gong-Xiao-Yan et al. Research on inflow at low Reynolds number in square section straight Micro- channel[J]. Journal of Drainage and Irrigation Machinery Engin, 2011, 29(4): 347-351.
Lee S Y,Wereley S T, Gui Lichuan, et al. Microchannel flow measurement using micro particle image velocimetry[ C ] //Proceedings of 2002 ASME International Mechanical Engineering Congress & Exposition. New Orleans, Louisiana: IMECE2002-33682.
Qu Weilin Mudawar I,Lee S Y, et al. Experimental and computational investigation of flow development andpressure drop in a rectangular micro-channel [ J ]. Journal of Electronic Packaging ,2006,128 ( 1 ) : 1 - 9.
Wang Haoli, Wang Yuan, Zhang Jiazhong. Influence of ribbon structure rough wall on the microscale poiseuille flow[ J]. Journal of Fluids Engineering, 2005,127 ( 6 ): 1140 - 1145.
Wang Haoli, Wang Yuan. Flow in microchannels with rough walls : Flow pattern and pressure drop [ J ]. Journal of Micromechanics and Microengineering, 2007,17 ( 3 ): 586 - 596.