Flow and heat transfer characteristics of non-uniform heat-pipe heat exchanger

被引：0
|
作者：
Qian M. [1 ,2 ]
Hu H. [1 ]
Xiang Z. [1 ]
Ma C. [1 ]
Hu X. [1 ]
机构：
[1] School of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou
[2] Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, Hangzhou
来源：
Fangzhi Xuebao/Journal of Textile Research | 2021年 / 42卷 / 12期
关键词：
Heat transfer characteristic; Heat transfer efficiency; Heat-pipe array; Non-uniform design; Non-uniform heat-pipe heat exchanger; Numerical simulation; Waste heat recovery;
D O I：
10.13475/j.fzxb.20201201908
中图分类号：
学科分类号：
摘要：
To reduce the flow resistance and improve the heat transfer efficiency of the heat-pipe heat exchanger, a non-uniform drop-shaped heat-pipe heat exchanger was developed. The computational fluid dynamics software ANSYS Fluent was used to simulate numerically the flow and heat transfer characteristics of the traditional staggered heat pipe arrays, drop-shaped heat-pipe arrays, and nonuniformly distributed drop-shaped heat-pipe arrays. The Nusselt numbers, friction coefficient and comprehensive index of heat transfer characteristics under different Reynolds numbers were obtained and compared with empirical formula to validate the feasibility. The results of comparative analysis show that compared with the traditional staggered heat-pipe array, the drop-shaped heat-pipe array has a larger effective heat transfer area without vortex in internal fluid flow, and it has a higher Nusselt number and a smaller friction coefficient with better comprehensive heat transfer characteristics. Moreover, the flow turbulence in the drop-shaped heat-pipe array is increased through the non-uniform design, and the Nusselt number is increased simultaneously, resulting in the increase of the heat transfer characteristics. © 2021, Periodical Agency of Journal of Textile Research. All right reserved.
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页码：151 / 158
页数：7
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