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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/1858
Title: CFD analysis of power-law fluid flow and heat transfer around a confined semi-circular cylinder
Authors: Kumar A.
Dhiman, Amit Kumar
Baranyi L.
Published in: International Journal of Heat and Mass Transfer
Abstract: A numerical analysis using Ansys Fluent was carried out to investigate the forced convection of power-law fluids (power-law index varying from 0.2 to 1.8) around a heated semi-circular cylinder with wall confinement (or blockage ratio) of 25%, Prandtl number of 50, and Reynolds numbers 1-40. Flow and thermal fields were found to be steady for Re up to 40. The shear-thickening behavior was found to have a higher value of drag coefficient, whereas the shear-thinning behavior had a smaller value of drag coefficient when compared with Newtonian fluids in the steady regime. The wake size was found shorter in shear-thickening fluids than Newtonian and shear-thinning fluids. An overall heat transfer rate was calculated and found to increase with the rise in Reynolds number. The average Nusselt numbers were observed higher for shear-thinning fluids than Newtonian and shear-thickening fluids; and the maximum enhancement in the heat transfer was achieved approximately 47% as compared to Newtonian fluids. The present results have also been correlated in terms of wake length, drag coefficient and average Nusselt number expressions for various Reynolds numbers and power-law indices studied. In addition, the effects of blockage ratios ranging from 16.67% to 50% on the engineering output parameters with varying power-law index at Re = 40 were reported. © 2014 Elsevier Ltd. All rights reserved.
Citation: International Journal of Heat and Mass Transfer (2015), 82(): 159-169
URI: https://doi.org/10.1016/j.ijheatmasstransfer.2014.11.046
http://repository.iitr.ac.in/handle/123456789/1858
Issue Date: 2015
Publisher: Elsevier Ltd
Keywords: Confined flow
Drag coefficients and Nusselt number
Heat transfer
Momentum transfer
Power-law index
Semi-circular cylinder
ISSN: 179310
Author Scopus IDs: 56372610200
8548369300
7003835583
Author Affiliations: Kumar, A., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Dhiman, A., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Baranyi, L., Department of Fluid and Heat Engineering, Institute of Energy Engineering and Chemical Machinery, University of Miskolc, Miskolc-Egyetemváros, 3515, Hungary
Funding Details: The third author gratefully acknowledges the support of the TÁMOP-4.2.1.B-10/2/KONV-2010-0001 project in the framework of the New Hungarian Development Plan. The realization of this project is supported by the European Union , co-financed by the European Social Fund. The authors also would like to thank the two anonymous reviewers for their valuable and helpful comments on this work.
Corresponding Author: Baranyi, L.; Department of Fluid and Heat Engineering, Institute of Energy Engineering and Chemical Machinery, University of MiskolcHungary
Appears in Collections:Journal Publications [CH]

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