Numerical Simulation of Laminar Flow and Heat Transfer Over a Blunt Flat Plate in Square Channel
Numerical Simulation of Laminar Flow and Heat Transfer Over a Blunt Flat Plate in Square Channel
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方形通道内钝平板层流及传热的数值模拟
DOI：
10.1115/1.1420715
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发表时间：
2002
影响因子：
--
通讯作者：
T. Ota
中科院分区：
文献类型：
--
作者：
H. Yanaoka;H. Yoshikawa;T. Ota
本文对方形通道内钝平板层流分离与再附流动与换热进行了三维数值模拟。采用有限差分法对Navier-Stokes方程和能量方程进行了数值计算。将三维计算结果与二维计算结果进行了比较，并讨论了侧壁的影响。结果表明，回流区的再附长度随雷诺数的增加而增加，回流区的流动呈现三维流动。侧壁效应使再附着线弯曲。随着雷诺数的增加，流动的二维性降低。侧壁附近形成的马蹄涡对二次发展区的换热有很大影响。随着雷诺数的进一步增大，板中心附近的分离剪切层变得不稳定，旋涡周期性地从再附着区脱落。这种涡呈现出发夹状结构，对传热有很大影响
Three-dimensional simulations of laminar separated and reattached flow and heat transfer over a blunt flat plate in a square channel are presented. Numerical calculations of Navier-Stokes equations and energy equation are carried out using the finite difference method. Results of three-dimensional calculation are compared with two-dimensional ones and effects of the side walls are described. It is clarified from the present results that the reattachment length increases with an increase of Reynolds number and the flow in the recirculation region becomes three-dimensional. The reattachment line is curved by the side wall effects. Two-dimensionality of the flow is reduced as Reynolds number increases. The horseshoe-vortex formed near the side walls has great effects upon the heat transfer in the redeveloping flow region. The separated shear layer around the center of plate becomes unstable with a further increase of Reynolds number and the vortices are periodically shed from the reattachment flow region. Such vortices exhibit a hairpin-like structure and greatly influence the heat transfer