Study of Variable Turbulent Prandtl Number Model for Heat Transfer to Supercritical Fluids in Vertical Tubes

被引:31
作者
Tian, Ran [1 ]
Dai, Xiaoye [2 ]
Wang, Dabiao [1 ]
Shi, Lin [1 ]
机构
[1] Tsinghua Univ, Key Lab Thermal Sci & Power Engn, Minist Educ, Dept Energy & Power Engn, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Dept Chem Engn, Beijing 100084, Peoples R China
基金
中国国家自然科学基金;
关键词
Turbulent Prandtl Number; Supercritical Fluid; Heat Transfer; THERMOPHYSICAL PROPERTIES; CIRCULAR TUBES; CARBON-DIOXIDE; WATER; FLOW; CO2; PERFORMANCE; CHANNELS;
D O I
10.1007/s11630-018-1002-7
中图分类号
O414.1 [热力学];
学科分类号
摘要
In order to improve the prediction performance of the numerical simulations for heat transfer of supercritical pressure fluids, a variable turbulent Prandtl number (Pr-t) model for vertical upward flow at supercritical pressures was developed in this study. The effects of Pr-t on the numerical simulation were analyzed, especially for the heat transfer deterioration conditions. Based on the analyses, the turbulent Prandtl number was modeled as a function of the turbulent viscosity ratio and molecular Prandtl number. The model was evaluated using experimental heat transfer data of CO2, water and Freon. The wall temperatures, including the heat transfer deterioration cases, were more accurately predicted by this model than by traditional numerical calculations with a constant Pr-t. By analyzing the predicted results with and without the variable Pr-t model, it was found that the predicted velocity distribution and turbulent mixing characteristics with the variable Pr-t model are quite different from that predicted by a constant Pr-t. When heat transfer deterioration occurs, the radial velocity profile deviates from the log-law profile and the restrained turbulent mixing then leads to the deteriorated heat transfer.
引用
收藏
页码:213 / 222
页数:10
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