A research on the heat transfer performance of kerosene flowing in a vertical upward tube at supercritical pressure is presented.In the experiments,insights are offered on the effects of the factors such as mass flux,...A research on the heat transfer performance of kerosene flowing in a vertical upward tube at supercritical pressure 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 experimental data.展开更多
为研究在不同黏度的条件下的垂直管段塞流流动特性,进行了实验和数值模拟研究,对不同黏度下的截面压力、含液率、压差波动信号及压降值进行分析。结果表明:液相黏度的增大使气塞长度减小,并缩短至7.5~9倍的管径,段塞周期缩短,管道截面...为研究在不同黏度的条件下的垂直管段塞流流动特性,进行了实验和数值模拟研究,对不同黏度下的截面压力、含液率、压差波动信号及压降值进行分析。结果表明:液相黏度的增大使气塞长度减小,并缩短至7.5~9倍的管径,段塞周期缩短,管道截面压力和压差波动会随之加快,平均持液率也逐渐增大,Mukherjee-Brill模型无法准确预测高黏油气流动的持液率,VOF(volume of fluent model)模型的持液率计算精度较高。液相黏度的变化对段塞流压降有一定影响,实验和模拟计算中都出现了负摩阻压降现象,总压降随着黏度增大而增大;Beggs-Brill模型的压降计算精度随着黏度的增加而降低,Hagedorn-Brown模型和VOF模型对压降的预测效果较好,误差低于15%,可见优于其他模型。展开更多
基金Supported by the National Science Foundation of Zhejiang Province(Z13E060001)the National Natural Science Foundation of China(52176091)+1 种基金the National Science Foundation of Shandong Province(ZR2012EEQ017)the PhD Program Foundation of Ministry of Education of China(20120101110102)
文摘A research on the heat transfer performance of kerosene flowing in a vertical upward tube at supercritical pressure 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 experimental data.
文摘为研究在不同黏度的条件下的垂直管段塞流流动特性,进行了实验和数值模拟研究,对不同黏度下的截面压力、含液率、压差波动信号及压降值进行分析。结果表明:液相黏度的增大使气塞长度减小,并缩短至7.5~9倍的管径,段塞周期缩短,管道截面压力和压差波动会随之加快,平均持液率也逐渐增大,Mukherjee-Brill模型无法准确预测高黏油气流动的持液率,VOF(volume of fluent model)模型的持液率计算精度较高。液相黏度的变化对段塞流压降有一定影响,实验和模拟计算中都出现了负摩阻压降现象,总压降随着黏度增大而增大;Beggs-Brill模型的压降计算精度随着黏度的增加而降低,Hagedorn-Brown模型和VOF模型对压降的预测效果较好,误差低于15%,可见优于其他模型。
