Laminar Fully Developed Flow in Periodically Converging-Diverging Microtubes
Laminar Fully Developed Flow in Periodically Converging-Diverging Microtubes
复制标题
周期性会聚-发散微管中充分发展的层流流动
DOI：
10.1115/icnmm2008-62187
复制
发表时间：
2008
影响因子：
2.3
通讯作者：
D. Sinton
中科院分区：
文献类型：
--
作者：
M. Bahrami;M. Akbari;D. Sinton
本文研究了线性变截面缩放微管内层流充分发展流动和压降特性。这些微管由一系列会聚-发散模块形成。本文建立了一个在渐扩段和渐缩段轴向流速分布为抛物线的摩阻分析模型。流动阻力被发现是唯一的几何参数的函数。为了验证该模型，进行了数值研究的雷诺数范围从0.01到100，为各种锥角，从2到15度，和最大最小半径比范围从0.5到1。与数值计算结果的比较表明，该模型能较准确地预测轴向速度和流阻。正如预期的那样，流阻被发现是有效的独立的雷诺数从数值结果。参数研究表明，半径比的影响比半径比的影响更显著。
Laminar fully developed flow and pressure drop in linearly varying cross-sectional converging–diverging microtubes have been investigated in this work. These microtubes are formed from a series of converging–diverging modules. An analytical model is developed for frictional flow resistance assuming parabolic axial velocity profile in the diverging and converging sections. The flow resistance is found to be only a function of geometrical parameters. To validate the model, a numerical study is conducted for the Reynolds number ranging from 0.01 to 100, for various taper angles, from 2 to 15 degrees, and for maximum–minimum radius ratios ranging from 0.5 to 1. Comparisons between the model and the numerical results show that the proposed model predicts the axial velocity and the flow resistance accurately. As expected, the flow resistance is found to be effectively independent of the Reynolds number from the numerical results. Parametric study shows that the effect of radius ratio is more significant than th...