摘要
基于Navier-Stokes方程,利用SIMPLER算法并辅以区域扩充法,对梯形微通道内水的充分发展层流摩擦阻力特性进行数值研究。选取25个不同纵横比的梯形尺寸进行计算,并将计算的摩擦常数与H.Y.Wu和P.Cheng的实验值进行了比较。结果表明:计算值与实验值符合较好;阻力系数随纵横比(Wb/Wt)的增大而增大。同时,计算表明,Navier-Stokes方程即使在水力当量直径小到25.9μm的微通道内依然适应。
A numerical research was conducted to analyze the friction constants of laminar flow of water in smooth trapezoidal silicon microchannels with different aspect ratios. Based on the Navier-Stokes equation, the friction factors of 25 different trapezoids were calculated using SIMPLER algorithm and domain extension method. Compared the calculated results with the experimental results of H. Y. Wu and P. Cheng, it is shown that the calculated results are in reasonable agreement with the experimental results given by H. Y. Wu and P. Cheng, and the nels increase with the aspect ratios increasing. friction constants of these microchan- Therefore, it is confirmed that the Navier-Stokes equations are still valid for the laminar flow of water in smooth silicon microchannels having hydraulic diameter as small as 25.9 um.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2008年第8期739-742,共4页
Atomic Energy Science and Technology
关键词
数值计算
梯形微通道
层流
摩擦常数
纵横比
numerical computation
trapezoidal microchannels
laminar flow
friction constant
aspect ratio
