Flow and heat transfer characteristics of supercritical nitrogen in micro-channel with different cavity structures

被引：0
|
作者：
Han C. [1 ,2 ]
Huang Y. [1 ,2 ]
Xu J. [1 ,2 ]
机构：
[1] College of Mechanical and Electrical Engineering, Fujian Agriculture and Forestry University, Fujian, Fuzhou
[2] Fujian Key Laboratory of Agricultural Information Sensing Technology, Fujian, Fuzhou
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 11期
关键词：
cavity; flow; heat transfer; micro-channel; structure; supercritical nitrogen;
D O I：
10.16085/j.issn.1000-6613.2022-2246
中图分类号：
学科分类号：
摘要：
In order to realize the efficient design of the surface structure of the micro-channel heat exchanger, the effects of cavity shapes (straight micro-channel, circular, rectangular and trapezoidal) and ovality on the flow and heat transfer performance of micro-channel were studied by means of numerical simulation and experiment, using supercritical nitrogen as the fluid medium, the mechanism of fluid efficient and low resistance heat transfer enhancement was revealed. The results showed that compared with the straight micro-channel, the entrance distance required for the SCN2velocity on the axis of the circular cavity micro-channel to reach a stable value was shorter, which was due to the fact that the cavity can promote the fluid flow/thermal boundary layer to be in the alternate state of destruction and reconstruction all the time. The shape of the fluid vortex in the circular cavity was consistent with the cavity geometry, and its flow resistance and heat transfer performance were optimal, followed by trapezoidal cavity micro-channel and rectangular cavity micro-channel. With the increase of ovality, the overall performance of cavity micro-channel increased firstly and then decreased. When the ovality was 1, the overall performance was optimal. The research results in this paper are of great significance for improving the design and manufacturing capability of micro-channel heat exchangers. © 2023 Chemical Industry Press. All rights reserved.
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页码：5592 / 5601
页数：9
相关论文
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