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Heat transfer analysis on dimple geometries and arrangements in dimple jacketed heat exchanger

Jin-yuan Qian (Institute of Process Equipment, Zhejiang University, Hangzhou, China and Department of Energy Sciences, Lunds Universitet, Helsingborg, Sweden)
Zan Wu (Department of Energy Sciences, Lund University, Lund, Sweden)
Qian-Kun Zhang (Sinochem Lantian, Hangzhou, China)
Zhi-Jiang Jin (Faculty of Science, Zhejiang University, Hangzhou, China)
Bengt Ake Sunden (Department of Energy Sciences, Lund University, Lund, Sweden)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 14 August 2019

Issue publication date: 11 September 2019

Abstract

Purpose

The purpose of this paper is to study the effects of dimple geometries and arrangements on the heat transfer enhancement in a dimple jacketed heat exchanger.

Design/methodology/approach

For the purpose of this paper, with the experimental validated numerical model, this paper carries out numerical simulations of both single dimples with different geometries and the whole dimple jacketed heat exchanger with different dimple arrangements. For a single dimple, its secondary vortex flow, temperature differences and the pressure drop performance for different geometries are analyzed. For the whole dimple jacketed heat exchanger, the heat transfer and pressure drop performances are investigated by comparing the no dimple, triangular and rectangular dimple arrangements.

Findings

Results show that dimples can improve the heat transfer efficiency compared with conventional jacketed heat exchanger, and specific geometries and arrangement of dimples for better heat transfer performance are figured out.

Originality/value

This paper considers both dimple geometries and arrangements, which can be useful for further applications in specific integrated devices or similar applications.

Keywords

Acknowledgements

This work is supported by the National Natural Science Foundation of China through Grant Number 51805470, the Fundamental Research Funds for the Central Universities through Grant Number 2018QNA4013 and the Youth Funds of the State Key Laboratory of Fluid Power and Mechatronic Systems (Zhejiang University) through Grant Number SKLoFP-QN-1801.

Citation

Qian, J.-y., Wu, Z., Zhang, Q.-K., Jin, Z.-J. and Sunden, B.A. (2019), "Heat transfer analysis on dimple geometries and arrangements in dimple jacketed heat exchanger", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 29 No. 8, pp. 2775-2791. https://doi.org/10.1108/HFF-12-2018-0792

Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited