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Assessment of vortex generator shapes for enhancing thermohydraulic performance of fluid flow in a channel equipped with perforated chevron plate-fin

Faezeh Nejati Barzoki (Department of Mechanical Engineering, University of Kashan, Kashan, Iran)
Ghanbar Ali Sheikhzadeh (Department of Mechanical Engineering, University of Kashan, Kashan, Iran)
Morteza Khoshvaght Aliabadi (Department of Chemical Engineering, Shahrood Branch, Islamic Azad University, Shahrood, Iran)
Ali Akbar Abbasian Arani (Department of Mechanical Engineering, University of Kashan, Kashan, Iran)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 25 January 2021

Issue publication date: 24 May 2021

142

Abstract

Purpose

The purpose of this paper is to investigate thermohydraulic characteristics of turbulent flow of water (4,000 = Re = 10,000) in a rectangular channel equipped with perforated chevron plat-fin (PCPF) with different vortex generators (VGs) shapes.

Design/methodology/approach

First, three general shapes of VGs including rectangular, triangular and half circle, are compared to each other. Then, the various shapes of rectangular VGs, (horizontal, vertical and square) and triangular VGs, (forward, backward and symmetric) are evaluated. To comprehensively evaluate the thermohydraulic performance of the PCPF with various VG shapes, the relationship between the Colburn factor and the friction factor (j/f) is presented, then a performance index (η) is applied using these factors.

Findings

Results show that the enhanced models of the PCPF, which are equipped with VGs, have higher values of j/f ratio and η as compared with the reference model (R). Further, the half-circle VG with the lowest pressure drop values (about 2.4% and 4.9%, averagely as compared with the S and ST vortex generators), shows the highest thermohydraulic performance among the proposed shapes. The maximum of performance index of 1.14 is found for the HC vortex generator at Re = 4,000. It is also found that the square and forward triangular VGs, have the best thermohydraulic performance among the rectangular and triangular VGs respectively and the highest performance index of 1.13 and 1.11 are reported for these VGs.

Originality/value

The thermohydraulic performance of the PCPF with different vortex generators VGs shapes have been investigated.

Keywords

Acknowledgements

The authors wish to thank the Research and Technology Administration of the University of Kashan for their support regarding this research (Grant No. 785398).

Citation

Nejati Barzoki, F., Sheikhzadeh, G.A., Khoshvaght Aliabadi, M. and Abbasian Arani, A.A. (2021), "Assessment of vortex generator shapes for enhancing thermohydraulic performance of fluid flow in a channel equipped with perforated chevron plate-fin", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 31 No. 6, pp. 1790-1815. https://doi.org/10.1108/HFF-02-2020-0087

Publisher

:

Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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