Journal of South China University of Technology(Natural Science Edition) ›› 2023, Vol. 51 ›› Issue (3): 22-32.doi: 10.12141/j.issn.1000-565X.220232

Special Issue: 2023年能源、动力与电气工程

• Energy,Power & Electrical Engineering • Previous Articles     Next Articles

Numerical Analysis with Thermal-Magnetic-Fluid Coupling on Enhanced Heat Transfer for Shell-and-Tube Heat Exchanger

XIE ZhihuiLIU Hanyu1 WU Jiechang1 LU Zhuoqun1,2 ZHANG Jian1 XI Kun1   

  1. 1.School of Power Engineering,Naval University of Engineering,Wuhan 430033,Hubei,China
    2.School of Energy,Mechanical & Electronic Engineering,Hunan University of Humanities,Science and Technology,Loudi 417000,Hunan,China
  • Received:2022-04-23 Online:2023-03-25 Published:2022-07-15
  • Contact: 谢志辉(1977-),男,教授,博士生导师,主要从事热力学优化、热管理与热设计研究。 E-mail:zhihui-xie@163.com
  • About author:谢志辉(1977-),男,教授,博士生导师,主要从事热力学优化、热管理与热设计研究。
  • Supported by:
    the National Natural Science Foundation of China(51979278)

Abstract:

This paper used Fe3O4/water magnetic nanofluid and magnetic field to improve the convective heat transfer performance of shell side of shell and tube heat exchanger. Through three-dimensional numerical simulation, this paper analyzed the effects of magnetic nanofluid volume fraction, flow rate and magnetic induction intensity on the convective heat transfer performance of shell and tube heat exchanger. The results show that the heat transfer rate and strengthening effect of the heat exchanger can be improved due to the thermal conductivity and Brownian motion of the nanoparticles, but when the volume fraction is greater than 1%, the improvement will gradually decrease and the efficiency evaluation coefficient will also decrease. Compared with other performance enhancement techniques, the effect of magnetic field on magnetic nanofluid can significantly improve the heat transfer performance of the heat exchanger with little increase in pressure drop. Compared with the condition without magnetic nanofluid and magnetic field, the heat transfer rate can be increased by up to 68.2%, while the pressure drop only increases by 13.8%. Compared with the condition with magnetic nanofluid but without magnetic field, the heat transfer rate can be increased by up to 46.7% and the pressure drop only increases by 1.96%. The high thermal conductivity of magnetic nanoparticles and Brownian motion effect, as well as the inner to outer swirling flow driven by magnetic nanofluids under the action of vertical uniform magnetic field, aggravate the disturbance of thermal boundary layer and the mixing of hot and cold fluids, and this is the main reason for the increase of convective heat transfer performance. And the greater the magnetic induction intensity is, the lower the fluid flow rate is, and the more significant the influence of the magnetic field on the fluid is.

Key words: shell and tube heat exchanger, enhanced heat transfer, multiphysics coupling, magnetic field, nanofluids

CLC Number: