气固两相流中颗粒间碰撞传热进展

Advances of impact heat transfer between particles in gas-solid flow

稠密气固两相流中,颗粒间的碰撞成为流动、传热过程的重要作用机理,它们对热交换过程有重要的贡献。文章概述了气固两相流中,颗粒间碰撞传热机理的研究现状;评述了欧拉-拉格朗日和欧拉-欧拉模型框架下,颗粒间碰撞传热研究的进展。基于颗粒动力学理论和随机碰撞频率的概念,建立了适用于欧拉-欧拉方法的颗粒间碰撞传热的数学模型。

The inter-particle heat transfer due to collision is thought to be significant in the dense gas-solid two phases flow, such as in bubbling and turbulent fluidized beds. The colliding particle-particle heat transfer mechanism was summarized. The current situation and development of colliding heat transfer in the frame of Eulerian/Eulerian and Eulerian/Lagrangian model were reviewed. Based on the granular kinetic theory and stochastic collision frequency, a mathematics model was presented for predicting the particle-to-particle heat transfer in Eulerian/Eulerian approach.