Title: Entropy generation analysis of fully developed turbulent convection in a twisted elliptical duct with constant heat flux

Authors: Junlin Cheng; Zizhao Wang; Huiyi Mao

Addresses: School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212000, China ' School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212000, China ' School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212000, China

Abstract: In this study, the entropy generation and exergy efficiency of turbulent flow through a twisted elliptical tube were investigated. The effects of the fluid properties, the aspect ratio (1.05-10.00) and the twist pitch ratio (4-200) were considered. The results indicated that the total dimensionless entropy generation increased whereas the exergy efficiency decreased as the twist pitch ratio increased. Moreover, the total dimensionless entropy generation decreased, whereas the exergy efficiency increased with an increase in the aspect ratio. The minimum total dimensionless entropy generation of 0.01 is obtained with an aspect ratio of 10.00 and a twist pitch ratio of 16.36.

Keywords: entropy generation; exergy efficiency; turbulent flow; twisted elliptical duct; constant heat flux; geometry configuration.

DOI: 10.1504/IJEX.2023.131483

International Journal of Exergy, 2023 Vol.41 No.2, pp.131 - 141

Received: 17 Jul 2022
Received in revised form: 23 Dec 2022
Accepted: 26 Dec 2022
Published online: 14 Jun 2023 *

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