Numerical Simulation of Heat Transfer in a Gravity Heat Pipe Based on an Improved Phase Change Model

被引：0
|
作者：
Chen J. [1 ]
Yin J. [1 ]
Zhao G. [1 ]
Ma S. [1 ]
机构：
[1] Shanxi Province Key Laboratory of Clean & High Efficient Combustion and Utilization of Circulating Fluidized Bed, Taiyuan University of Technology, Shanxi Province, Taiyuan
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2023年 / 43卷 / 08期
关键词：
condensation coefficient; gravity heat pipe; numerical simulation; phase change; saturation temperature;
D O I：
10.13334/j.0258-8013.pcsee.220753
中图分类号：
学科分类号：
摘要：
The numerical model based on an improved phase change model and the saturated vapor pressure equation of working fluid are developed to simulate the heat transfer characteristics and phase change process of a gravity heat pipe. The influences of empirical coefficient of condensation βc and saturation temperature Tsat of working fluid on the simulation results are analyzed. The results show that the model with modified βc has smaller relative mass deviation than the model with original βc. The model with modified βc has smaller relative deviation for absolute temperature distribution along the wall of the heat pipe than the model with constant βc. The model with modified βc in this work has the tendency to reach the mass and energy balance in the phase change process of a gravity heat pipe more quickly than the one with original βc. The deviations between the simulated wall temperatures and experimental data at different sections of the heat pipe are different with the same Tsat. The temperature deviation is the biggest for the evaporation section while the deviation at the condensation section is the smallest. Reasonable value of Tsat should be chosen in the numerical model. The new value of Tsat is recalculated after each calculation step using saturated vapor pressure equation of the working fluid and the reasonable value is obtained automatically. The simulated results are then compared with the experimental data and good consistency is obtained. The model developed in this work can also detail the phase change process and can be used to predict heat transfer performance for gravity heat pipes. © 2023 Chinese Society for Electrical Engineering. All rights reserved.
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页码：3109 / 3116
页数：7
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