【作者】 徐轶君； 姜培学； 石润富； 任泽霈；

【Author】 Xu Yijun Jiang Peixue Shi Runfu Ren Zepei

【机构】 清华大学热能工程系；

【摘要】 本文在已有研究的基础上,对超临界二氧化碳在竖直微细圆管中的对流换热进行了进一步实验研究,增加了不同压力下的实验结果,研究了压力、入口温度、流体流量、热流密度及浮升力等对换热的影响。结果表明,超临界压力条件下流体的进口温度、流量、压力和热流密度对对流换热有很大影响。8．5 MPa压力下物性变化比9．5 MPa 更大,已有准则关联式的计算结果与实验结果有很大差别,计算关联式有待进一步改善。更多还原

【Abstract】 Further research of convection heat transfer of supercritical CO2 in mini tubes was carried out based on former results. The effects of inlet temperature, mass flow rate, heat flux and inlet pressure on convection heat transfer were investigated experimentally. All of the parameters significantly influenced the convective heat transfer. Since the variation of thermophysical properties of CO2 at 8.5MPa is sharper than that at 9.5MPa, the difference between the experimental data and the calculated results was larger at 8.5MPa.更多还原