中文摘要：

采用实验与数值模拟相结合的方法,研究了去离子水在低Reynolds数下流过顺排微柱群内部时的速度场、压力场以及流动阻力特性。实验测量了柱直径为0.5 mm,柱高度分别为1.00、0.75、0.50、0.25 mm的顺排微柱群的阻力系数,发现在端壁面效应的作用下,微柱群内阻力系数随柱高增加而减小,且现有关联式对实验结果预测并不理想。因此建立了三维不可压数学模型,数值模拟了柱间距分别为0.75、1.00、1.25 mm,柱高度分别为1.00、0.75、0.50、0.25 mm,行数分别为3、5、7、9,列数分别为5、10、15、20的顺排排列微柱群的内部流场及旋涡的分布,在此基础上获得了顺排微柱群流动阻力的新型计算关联式。研究发现,随着柱间距的增大,流场内旋涡增多,流动阻力增大。此外,顺排微柱群内部阻力系数随着柱高的增加、列数减少而减小,而微圆柱排数对阻力系数的影响在本文研究范围内不明显。研究还表明,本文所得关联式在40〈Re〈150范围内与实验值偏差为10%～25%,能够对微柱群内部流动特性进行有效估算。

英文摘要：

The flow field,pressure filed and friction characteristics of laminar flow in in-line arranged micro-cylinder groups were numerically investigated using de-ionized water as working fluid at low Reynolds numbers.The friction factors in the micro-cylinder group（cylinder diameter D=0.5 mm,cylinder height H=1.00,0.75,0.50 and 0.25mm）were measured.It was found that the friction factor decreased with the increase of micro-cylinder height due to the end-wall effect,and the correlations available could not predict the friction characteristics very well.A 3-D model was employed to simulate the vortex distribution in the in-line micro-cylinder groups with different geometrical parameters,including the diameter（0.5 mm）and height（0.25,0.50,0.75,and 1.00 mm）of micro-cylinder,pitch（0.75,1.00,and 1.25 mm）,and number of rows（3,5,7,9）and columns（5,10,15,20）of micro-cylinder.It was found that the vortex number increased with the pitch ratio,so that the friction factor increased.The friction factor for the in-line arranged micro-cylinder group decreased with the increase of the cylinder height and the decrease of the column number,but the influence of the row number on the friction factor was negligible.A new correlation was obtained to predict the friction factor of laminar flow in the in-line arranged micro-cylinder group and the deviation of predictions from experimental results is 10%—25% at 40Re150.