两相流中颗粒相对湍流动能修正的模型及其应用

讨论了两相流中颗粒相对湍流动能及其耗散率的影响．通过单个颗粒在流场中运动的分析，推导出由颗粒引起的湍流动能的耗散，并和由颗粒后的尾流及涡的脱落引起的湍流动能的增加一起加入ｋε方程中，将此模型应用到竖直圆管中的气粒两相流的计算， 并与实验结果进行比较，发现本文的模型比文献［１］ 的模型有一定的改进．

Modulation of Turbulent Kinetic Energy by Particles in Two Phase Flows

The present work is concerned with the modulation of turbulent kinetic energy and its dissipation by the particles the two phase flows. The extra dissipation of turbulent kinetic energy due to particles is derived by analyzing a single particle moving through a vortex. The increment of turbulent kinetic energy due to the wake behind the particle and the vortex shedding is added to the k equations. The proposed model is applied to a two phase flow of air and solid in a vertical pipe and compared with an existing model as well as the experimental data. The agreement between the prediction of the proposed model and experimental results shows that the model presented in this paper is an improvement on the existing model.