振荡流共轭换热格子——Boltzmann模拟

振荡流共轭换热现象广泛存在于热声热机等工程应用中.基于双分布格子-Boltzmann模型,对平行平板间振荡流共轭换热进行了数值模拟.通过假定共轭界面处流体和固体的未知内能分布函数均为对应的平衡态滑移修正格式,提出了一种处理共轭换热边界的新方法.模拟结果表明,该方法可以保证共轭界面上温度连续和热流连续.分析了不同流体与固体导热系数比情况下振荡流共轭换热的速度场、温度场以及热流分布的特点.

LATTICE BOLTZMANN SIMULATIONS ON CONJUGATE HEAT TRANSFER IN OSCILLATING FLOW

The conjugate heat transfer in oscillating flow is a typical phenomenon in engineering such as thermoacoustic engines.In this paper,double-species thermal lattice Boltzmann method is used to simulate the conjugate heat transfer in oscillating flow between two parallel plates.A new treatment of the conjugate thermal boundary condition is proposed,which is based on assuming the unknown energy distribution functions of both fluid and solid on the conjugate interface as the corresponding equilibrium forms with a counter-slip internal energy.Simulation results show that the continuities of the temperature and heat flux on the conjugate interface can be guaranteed exactly.The characteristics of velocity,temperature and heat flux distributions of the conjugate heat transfer in oscillating flow are discussed for different thermal conductivity ratios of fluid and solid.