气固两相流横掠圆管时边界层内流动和传热特性的研究

This project studies the flow and heat transfer properties of the gas-particle two-phase flow over round tube both numerically and experimentally. The direct numerical simulation methods was employed to analysis and study the turbulence quasi structure of the gas-particle two-phase flow over round tube and the movement characteristics of the particles within boundary layer and near wake in detail. The key factor affect the particle movement and the mechanism to intensify the heat transfer caused by the variation of the flow boundary layer and temperature boundary layer due to the existence of particles was found. Numerical experimentation of the impact erosion to the tube when particle flow over round tube was also done.

本项目拟对气固两相流横掠圆管时流动和传热特性进行实验和理论研究。通过实验着重分析颗粒的存在对边界层内速度、边界层厚度、边界层分离的影响，以及颗粒存在引起壁面温度边界层变化所导致的强化传热机理。在此基础上建立气固两相流绕圆管时边界层内流动和换热的综合数学模型，并对该问题进行数值模拟。本课题为多相流学科的前沿课题。