Friction Factor Characteristics of Rectangular Microchannels in Hydrodynamic Entrance Region

被引：0
|
作者：
Duan Z. [1 ]
Ning X. [1 ]
Su L. [1 ]
Ma H. [1 ]
机构：
[1] School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing
来源：
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | 2019年 / 47卷 / 09期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
Friction factor characteristics; Hydrodynamic entrance region; The hydrodynamic entrance length; The product of apparent friction factor and Reynolds number;
D O I：
10.12141/j.issn.1000-565X.180615
中图分类号：
学科分类号：
摘要：
The friction factor characteristics of rectangular microchannels with aspect ratio ε from 0.1 to 1.0 in hydrodynamic entrance region were investigated by using the Fluent software. The results reveal that the aspect ratio ε and Reynolds number Re have effects on the product (fappRe)of the apparent friction factor and Reynolds number. The fappRe of rectangular microchannels decreases as the aspect ratio ε increases, and different effects are presented in the different range of Re. The fappRe decreases with the increase of Re when Re is less than 300; while the fappRe varies slightly when Re is more than 300. When the flow is fully developed, the fappRe remains unchanged and becomes nearly independent of Reynolds number.The effects of ε and Re on the hydrodynamic entrance length is also studied. It is found that when Re is less than 20, the dimensionless entrance length gradually decreases with the increase of the aspect ratio ε. When Re is more than 20, the dimensionless entrance length first increases and then decreases with the increase of the aspect ratio ε, and reaches the peak value as the aspect ratio is between 0.3 to 0.4. Based on the obtained results, a new hydrodynamic entrance length correlation for laminar flow was proposed, which may provide guidance for the design and optimization of microchannels. © 2019, Editorial Department, Journal of South China University of Technology. All right reserved.
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页码：18 / 23
页数：5
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