垂直上升管内超临界压力下航空煤油传热特性研究(英文)

A research on the heat transfer performance of kerosene flowing in a vertical upward tube at supercritical pres-sure is presented. In the experiments, insights are offered on the effects of the factors such as mass flux, heat flux, and pressure. It is found that increasing mass flux reduces the wall temperature and separates the experimental section into three different parts, while increasing working pressure deteriorates heat transfer. The extended corresponding-state principle can be used for evaluating density and transport properties of kerosene, including its viscosity and thermal conductivity, at different temperatures and pressures under supercritical conditions. For getting the heat capacity, a Soave–Redlich–Kwong (SRK) equation of state is used. The correlation for predicting heat transfer of kerosene at supercritical pressure is established and shows good agreement with the experimen-tal data.     

超临界压力下纳米流体竖直管内流动换热

对超临界压力下Fe₃O₄-煤油纳米流体竖直管内的换热特性进行了实验研究,分析了不同压力、质量流量、热通量和纳米颗粒浓度对超临界压力下纳米流体换热特性的影响。超临界压力下,纳米流体在竖直管内沿管长呈现不同的换热规律。流体质量流量的提高或者工作压力的提高均会使纳米流体在竖直管内流动换热效果变好。而热通量的增大或纳米颗粒的添加对超临界压力下纳米流体的换热具有恶化效果。最后给出了纳米流体在超临界压力下的传热关联式,其计算值和实验值吻合良好。