Heat transfer of supercritical carbon dioxide in a tube-in-tube heat exchanger-a CFD study

Li, W., Yu, Z. , Wang, Y. and Li, Y. (2022) Heat transfer of supercritical carbon dioxide in a tube-in-tube heat exchanger-a CFD study. Journal of Supercritical Fluids, 181, 105493. (doi: 10.1016/j.supflu.2021.105493)

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Abstract

For better design and optimization of the heat exchanger (HX), forced convective heat transfer and flow characteristics of supercritical carbon dioxide (SCO2) in a water-cooled experimental counter-flow tube-in-tube HX were studied numerically with three-dimensional Reynolds-averaged Navier-Stokes equations and shear stress transport (SST) turbulence model by using computational fluid dynamics method in ANSYS CFX. With a sole tube model of the HX, effects of SCO2 inlet pressure, mass flux, tube diameter and wall heat flux on SCO2 mean heat transfer coefficient (MHTC) were investigated. Influences of turbulence models and discretisation schemes of the advection terms in the SST model, wall temperature of conservative and hybrid values in CFX-Post on MHTC were clarified, and buoyancy effect in the horizontal HX was explored. The SST model can achieve better agreement with the experimental MHTCs of SCO2 than the other models. The buoyancy effect can improve MHTC by the secondary flows in the tube.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Yu, Professor Zhibin and Li, Dr Wenguang
Authors: Li, W., Yu, Z., Wang, Y., and Li, Y.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Journal of Supercritical Fluids
Publisher:Elsevier
ISSN:0896-8446
ISSN (Online):1872-8162
Published Online:26 November 2021
Copyright Holders:Copyright © 2021 Elsevier B.V.
First Published:First published in Journal of Supercritical Fluids 181: 105493
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
300663Geothermally Sourced Power and Freshwater Generation for Eastern AfricaZhibin YuEngineering and Physical Sciences Research Council (EPSRC)EP/P028829/1ENG - Systems Power & Energy
312686Flexible Air Source Heat pump for domestic heating decarbonisation (FASHION)Zhibin YuEngineering and Physical Sciences Research Council (EPSRC)EP/V042033/1S&PS - Urban Studies