Enhanced heat transfer and flow resistance characteristics of twisted tube double-pipe heat exchangers

被引：0

作者：

Yin, Yingde ^{[1
]}

Nong, Yashan ^{[1
]}

Li, Yuanyu ^{[1
]}

Liu, Shijie ^{[2
]}

机构：

[1] School of Architecture and Transportation Engineering, Guilin University of Electronic Technology, Guangxi, Guilin

[2] Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangdong, Guangzhou

来源：

Huagong Xuebao/CIESC Journal | 2024年 / 75卷 / 10期

关键词：

coaxial casing heat exchanger; flow resistance; heat transfer; laminar flow; turbulent flow;

D O I：

10.11949/0438-1157.20240459

中图分类号：

学科分类号：

摘要：

A novel twisted tube coaxial heat exchanger was developed, and its heat transfer and flow characteristics were experimentally tested. Correlation formulas for Nusselt number (Nu) and friction factor (f ) criteria for the tube and shell passes were derived. The experimental results indicate that the total heat transfer coefficient and flow resistance increase with higher flow velocities. Within the test range of 0.1—1.5 m/s, the total heat transfer coefficient increased by approximately 34%, while the flow resistance increased from 37 Pa to 6033 Pa, representing a nearly 120-fold increase. The shell flow resistance increased from 361 Pa to 130761 Pa. For Reynolds numbers between 1000 and 10000, the performance evaluation factor (η) of the twisted tube coaxial heat exchanger exceeds 1, and reaches a maximum of 2.3. However, for Reynolds numbers between 10000 and 30000, η is less than 1. The overall comprehensive performance of the twisted tube coaxial heat exchanger is the best within a tube flow rate range of 0.1—0.5 m/s and a shell flow rate range of 0.1—0.4 m/s, indicating that it is suitable for small refrigeration and air conditioning equipment as well as application scenarios with low Reynolds numbers. © 2024 Materials China. All rights reserved.

引用

页码：3528 / 3535

页数：7

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