超临界压力正癸烷旋转通道内对流换热实验研究

本文对超临界压力正癸烷在旋转圆管内的对流换热开展了实验研究,获得了转速和热流密度对换热的影响规律。结果表明离心段和向心段对流换热均随着转速的升高而增强,离心段后缘面换热优于前缘面,而向心段则相反。低转速时,重力浮升力与离心浮升力大小相近,使换热发生恶化,随转速增加,重力浮升力可以忽略,换热增强。

Experimental Study on the Convective Heat Transfer of Supercritical Pressure N-Decane in Rotating Channel

In this paper,the convective heat transfer of supercritical pressure n-decane in a rotating circular tube was studied experimentally,and the influence of the rotational speed and heat flux on heat transfer was obtained.The results show that the convective heat transfer between the centrifugal and the centripetal section increases with the increase of the rotational speed.The heat transfer at the trailing edge of the centrifugal section is better than that of the leading edge,while the centripetal section is opposite.At low speeds,the gravity buoyancy force is similar to the centrifugal buoyancy force,which causes the heat transfer to deteriorate.As the speed increases,the gravity buoyancy force can be neglected and the heat transfer is enhanced.