摘要
在内径为2mm的竖直细圆管内进行了向上流动的超临界对流换热实验。通过实验发现,质量流量、进口温度对壁面温度分布以及压降有很大影响;并讨论了换热发生增强和恶化的原因;用浮升力和热加速准则解释了其中的一些热流体现象。并基于FLUENT软件进行了数值计算,与实验结果进行比较,分析表明,数值计算预测壁面温度分布和压降有一定的适用性。
Convection heat transfer of supercritical nitrogen in a small vertical tube with a diameter of 2mm was investigated experimentally. The tests investigated the effects of mass flow rate, inlet temperature on the local wall temperature and pressure drop, as well as the phenomena of enhanced and deteriorated heat transfer caused by buoyancy and thermal acceleration. Numeri- cal simulations are carried out by FLUENT, the numerical predictions correspond well to the experimental data under some conditions, but still need further improvement.
出处
《低温与超导》
CAS
CSCD
北大核心
2009年第7期9-13,共5页
Cryogenics and Superconductivity
关键词
超临界氮
换热
换热恶化
浮升力
数值计算
Supercritical nitrogen, Heat transfer, Deterioration of heat transfer, Buoyancy, Numerical simulation
