A unified model for multi-turn closed-loop pulsating heat pipe

被引:3
|
作者
Sarangi, Radha K. [1 ]
Swain, Abhilas [1 ]
Rane, Milind V. [2 ]
Kar, Satya P. [1 ]
Sekhar, Polymersetty C. [1 ]
机构
[1] KIIT Deemed Univ, Sch Mech Engn, Bhubaneswar, Odisha, India
[2] Indian Inst Technol, Dept Mech Engn, Mumbai, Maharashtra, India
关键词
heat transfer; liquid plug; multi-turn closed-loop pulsating heat pipe; plug momentum; thin film evaporation and condensation; vapor bubble; SLUG FLOW; PRESSURE LOSSES; TAYLOR FLOW; HYDRODYNAMICS; VELOCITY;
D O I
10.1002/htj.22047
中图分类号
O414.1 [热力学];
学科分类号
摘要
Numerical modeling of the multi-turn closed-loop pulsating heat pipe (CLPHP) in the bottom, horizontal, and top heat mode is presented in this paper, with water as working fluid. Modeling is carried out for 2-mm ID CLPHP having 5, 16, and 32 turns at different orientations for 10 different cases. Momentum and heat transfer variations with time are investigated by numerically solving the one-dimensional governing equations for vapor bubble and liquid plugs. Instead of considering all the vapor bubble at saturation temperature, vapor bubbles are allowed to remain in super-heated condition. Film thickness is found using a correlation. Two-phase heat transfer coefficient is calculated by considering conduction through the thin film at liquid-vapor interface. Liquid plug merging and splitting result in continuous variation in the number of liquid plugs and vapor bubble with time, which is also considered in the code. During the merging of liquid plugs, a time step-adaptive scheme is implemented and this minimum time step was found to be 10(-7) s. Model results are compared with the experimental results from literature for heat transfer and the maximum variation in heat transfer for all these cases is below +/- 39%.
引用
收藏
页码:3683 / 3703
页数:21
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