排灌机械工程学报
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排灌机械工程学报  2011, Vol. 29 Issue (4): 347-351    DOI: 10.3969/j.issn.1674—8530.2011.04.015
流体工程 最新目录 | 下期目录 | 过刊浏览 | 高级检索 Previous Articles  |  Next Articles  
方截面直微通道内低雷诺数流动分析
何文博1, 王元1, 龚霄雁1, 金文2
( 1. 西安交通大学能源与动力工程学院,陕西 西安 710049; 2. 西安航空技术高等专科学校动力工程系,陕西 西安 710077)
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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摘要 为了研究植物水分通道导管内流等雷诺数小于1的微通道内流流场特性,采用Micro-PIV试验测量技术和Fluent软件,通过设置合适的多孔介质区域厚度与动量源项,建立多孔介质模型模拟壁面粗糙元影响的数值模拟方法,在雷诺数分别为0.15,0.25和0.35时,对断面尺寸为400μm×400μm的方截面直微通道内流流场进行研究,并将试验与数值模拟结果与直接对控制方程解析求解所得的解析解进行比较.结果表明:微尺度通道往往具有壁面相对粗糙度高的特性,该特性对通道内流场分布造成的影响,在雷诺数很低的情况下,仍然不可忽视.解析解是针对常规尺度通道推出的,未考虑微通道较高的相对粗糙度对流场的影响,虽然其流场速度廓线的变化趋势与试验值相近,但其值在距离流道中心小于0.04 mm的主流区小于试验值,而在距离流道中心大于0.04 mm的近壁区大于试验值.采用多孔介质模拟壁面粗糙元则可以有效地实现对方截面直微通道低雷诺数内流的模拟,试验值所得数据点与模拟值所成曲线重合.
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何文博
王元
龚霄雁
金文
关键词低雷诺数   微通道   Micro-PIV   多孔介质模型     
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.
Key words low Reynolds number   Micro-channel   Micro-PIV   porous medium model   
收稿日期: 2010-11-08; 出版日期: 2011-07-30
基金资助:

 国家自然科学基金资助项目(10972176);陕西省教育厅科学研究计划项目(2010JK617)

通讯作者: 王 元( 1956-) , 男, 河北石家庄人, 教授, 博士生导师( 通信作者, wangyuan@ mail.xjtu.edu.cn) , 主要从事实验流体力学研究.   
作者简介: 何文博( 1984-) , 男, 陕西洛南人, 博士研究生( he.wenbo@ stu.xjtu.edu.cn) , 主要从事微尺度流动研究.
引用本文:   
何文博, 王元, 龚霄雁等. 方截面直微通道内低雷诺数流动分析[J]. 排灌机械工程学报, 2011, 29(4): 347-351.
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.
 
[1] 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.
[2] 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.
[3] 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.
[4] 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.
[5] 金文,张鸿雁,何文博.多孔介质壁面条件下微尺度流动的数值模拟[J].排灌机械工程学报,2010,28(3):271-276.
[6] Jayaraj S, Sangmo K, Yong K S. A review on the analysis and experiment of fluid flow and mixing in micro-chan- nels [ J]. Journal of Mechanical Science and Technology, 2007,21 (3) :536 - 548.
[7] Petrak D, Rauh H. Micro-flow metering and viscosity measurement of low viscosity Newtonian fluids using a fi-breoptical spatial filter technique [ J ]. Flow Measurement and Instrumentation, 2009,20 ( 2 ) :49 - 56.
[8] 王启杰.对流传热传质分析[M].西安交通大学出版社,1986..
[9] 工吴利.[D].两安:两安交通大学能源与动力工程学院,2006.
[1] 金文, 张鸿雁, 何文博 . 齿形微通道内流流场数值模拟及试验研究[J]. 排灌机械工程学报, 2011, 29(3): 255-259.

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