Flow Pattern and Heat Transfer Mechanism on Shell Side of Heat Exchanger with Quatrefoil-Hole Baffle

被引：0
|
作者：
Gong B. [1 ,2 ]
Wang H. [1 ]
Xing J. [1 ]
Wang D. [1 ]
Wang K. [1 ]
机构：
[1] Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province, Zhengzhou University, Zhengzhou
[2] Zhengzhou Branch of China Nuclear Power Engineering Company, Ltd., Zhengzhou
来源：
Wang, Dan | 1600年 / Xi'an Jiaotong University卷 / 54期
关键词：
Experimental correlation; Heat exchanger; Laser Doppler Velocimeter (LDV); Quatrefoil-hole baffle;
D O I：
10.7652/xjtuxb202006019
中图分类号：
学科分类号：
摘要：
The fluid flow pattern in the shell side of a heat exchanger and the influence of the baffle pitch and the height of the quatrefoil-hole on the thermal-hydraulic performance are studied, a periodic whole-section numerical model is built by CFD software to investigate the characteristics of fluid flow and heat transfer in the shell side of heat exchanger with quatrefoil-hole baffle. A velocity test in a heat exchanger with quatrefoil-hole baffle is carried out, and the axial velocities of some special points in the shell side are measured by the Laser Doppler Velocimeter (LDV). Numerical results are compared with the experimental results to verify the reliability of the numerical calculation. The results show that the fluid flow in the shell side of the heat exchanger flows longitudinally, an obvious jet comes into being behind the baffle, and the velocity of the fluid has a significant periodicity after passing through the first support baffle. Both the heat transfer coefficient and the pressure drop in the shell side increase with the decrease of the baffle pitch and the hole height, but the comprehensive performance decreases. The influence of the baffle pitch and the hole height on the pressure drop is stronger than that on the heat transfer. Within Reynolds number range from 10 000 to 30 000, the experimental correlations for Nusselt number and pressure drop in the shell side of the heat exchanger are obtained, and the calculation deviation of both correlations are within ±10%. The numerical model and results in this paper provide guidance for the design and application of the heat exchangers in the nuclear power plants. © 2020, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.
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页码：148 / 154
页数：6
相关论文
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