摘要
提出了颗粒碰撞壁面过程中颗粒打破边界层和颗粒与壁面导热的强化传热模型，以分析气固两相流中颗粒强化对流传热的机理，通过模型计算研究了风速、颗粒浓度和粒径等因素对颗粒在壁面的停留特性、颗粒在边界层的扰动及对导热和边界层破坏两种强化机制传热比重的影响．以气固两相流横掠圆管的传热过程为例进行计算，计算与实验结果一致，并获得了具有实用价值的关联计算式．
A mechanistic model is presented to describe the enhancement of convective heat transfer due to particle impact in gas-solid two-phase flow.In order to analyze the heat transfer enhancement mechanism,the boundary layer charcteristics and the heat conduction between particle and heated surface during particle impactive process are both taken into account in this model.Effects of gas velocity,particle concentration and particle size on particle residence characteristic,boundary layer characteristics and h_(c2)/h_(conp) are investigated by means of model calculation.In addition,the enhancement of heat transfer in gas-solid flow predicted by this model have been compared with experimental results and a good agreement is observed.Finally,a correlation equation for heat transfer enhancement of gas-solid cross flow in a tube is presented.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1998年第3期294-302,共9页
CIESC Journal
基金
国家自然科学基金!59606009
关键词
气固两相流
强化对流传热
传热
对流传热
gas-solid two-phase flow,enhancement of convection heat transfer,model
