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为研究黏性应力与脉动流强化传热的相关性,编写了基于D2Q9格式的格子玻尔兹曼数值模拟程序,获得了雷诺数Re=120时脉动流中等温圆柱体当地努塞尔数和无量纲黏性应力的分布特性。格子玻尔兹曼数值模拟程序采用双概率密度函数模型,圆柱体曲边界采用二阶精度的外推方法处理。数值模拟结果显示,无量纲的黏性应力与脉动流强化传热效果具有正相关特性。脉动流通过增加圆柱体迎风面的黏性应力,从而实现强化传热。
In order to study the relativity between viscous stress and enhanced heat transfer of pulsating flow, a lattice Boltzmann numerical simulation program based on D2Q9 format was prepared. The local Nusselt number of isothermal cylinder in Reynolds number Re = 120 was obtained Distribution characteristics of dimensionless viscous stress. Lattice Boltzmann numerical simulation program using the double probability density function model, cylindrical curve boundary using second-order precision extrapolation method. The numerical simulation results show that the non-dimensional viscous stress has a positive correlation with the enhanced heat transfer effect of pulsating flow. The pulsating flow increases the heat transfer by increasing the viscous stress on the windward side of the cylinder.