排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2011, Vol. 29 Issue (4): 347-351    DOI: 10.3969/j.issn.1674—8530.2011.04.015
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Research on inflow at low Reynolds number in square section straight Micro- channel
He Wenbo1,Wang Yuan1,Gong Xiaoyan1,Jin Wen2
(1.School of Energy and Power Engineering,Xi′an Jiaotong University,Xi′an,Shaanxi 710049,China;2.Department of Power Engineering,Xi′an Aeronautical College,Xi′an,Shaanxi 710077,China)
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Abstract 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.
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HE Wen-Bo
Wang-Yuan
Gong-Xiao-Yan
Jin-Wen
Key words low Reynolds number   Micro-channel   Micro-PIV   porous medium model     
Received: 2010-11-08; Published: 2011-07-30
Cite this article:   
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.
 
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