中文摘要：

本文对超临界压力下二氧化碳在竖直管内的对流换热进行了模拟研究，分析了超临界二氧化碳在临界点附近的物性变化，以及不同进口温度对换热系数的影响和换热系数与煨的关系。结果表明，在临界点附近，物性变化非常剧烈，尤其是比热容的变化最为明显；在较大雷诺数下，二氧化碳进口温度对微细管道换热系数的影响较小；不同截面处换热系数和煅的变化趋势一致。

英文摘要：

Convection heat transfer of supercritical pressure CO2 in vertical tube was investigated, the changes of physical property near critical point of supercritical carbon dioxide, the effects of different inlet temperatures on heat transfer coefficient and the relations between heat transfer coefficient and entransy was analyzed. The results show that the physical property changes were very violently around the critical point, especially to the specific heat of carbon dioxide. It also conclude that inlet temperatures of carbon dioxide have small influence on heat transfer coefficient of big Re in mini-tube and heat transfer coefficient and entransy have the same variation tendency at different section