管内高温介质层流入口段中的热辐射作用  

THERMAL RADIATION EFFECTS ON LAMINAR DEVELOPING FLOW OF HIGH TEMPER- ATURE MEDIUM IN A TUBE

作　　者：夏新林[1] 黄勇[1] 任德鹏[1] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001

出　　处：《工程热物理学报》2003年第6期1001-1003,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.50076010)

摘　　要：数值研究了高温介质密度随温度变化时,管内层流入口段耦合换热中的热辐射作用。采用离散坐标法、控制容积法耦合求解辐射传递方程、能量方程及N-S方程。考察了中等大小光学厚度下,热辐射作用对介质内速度分布、温度分布以及换热的影响。结果表明,即使在不大的光学厚度下,热辐射作用对管内高温介质层流入口段耦合换热的速度场与换热强度都有明显影响。For a laminar developing flow of high temperature medium in tube, the thermal radiation effects on the coupled heat transfer is investigated numerically. The density of the medium is dependent on the temperature. The discrete ordinate method and the control volume method are employed to solve the radiative transfer equation and the energy equation combined with the N-S equation. The thermal radiation effects on the distributions of velocity and temperature and that on the heat transfer are investigated under the moderate optical thickness. The results show that, in the coupled heat transfer of laminar developing flow of high temperature medium in a tube, the effects of thermal radiation on the velocity distribution and heat transfer intensity is obvious even though the optical thickness is not large.

关 键 词：热辐射 层流入口段 耦合换热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]