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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/1827
Title: Influence of height ratio on flow and heat transfer around trapezoidal geometry (a generic sharp-edged body) covering transition to periodic flow
Authors: Parveez M.
Dhiman, Amit KumarK.
Harmain G.A.
Published in: International Journal of Heat and Mass Transfer
Abstract: Flow around an isolated generic sharp-edged object with varying height ratio (? = 0–1) i.e. height from the rear end of the object to the front end (?=H2/H1) has been investigated in cross-flow configuration covering steady and periodic regimes at Reynolds number (Re) from 1 to 150 using air as a working fluid. Flow separation is delayed with a decrease in ?. Wake formed is the highest for ? = 1 (square object) and progressively decreases with the decrease in ?. The vortex shedding effect has been demonstrated on the heat transfer phenomena around the objects. For all the cases of height ratios, as Re increases the flow undergoes supercritical Hopf bifurcation to periodic state as steady-state condition loses its stability. Stuart-Landau theory has been used to determine the value of critical Re or the onset of vortex shedding for all the cases of height ratios. As ? increases from 0 to 0.7, the value of critical Re increases. Influence of surface vorticity and surface pressure on the overall drag coefficient (CD) has been explored. Effect of ? on the Strouhal number (St) has been investigated and the findings are in agreement with previous results. Finally, correlations relating Lr, CD, Nu? and St with Re and ? have been developed. © 2018 Elsevier Ltd
Citation: International Journal of Heat and Mass Transfer (2018), 124(): 1285-1309
URI: https://doi.org/10.1016/j.ijheatmasstransfer.2018.03.105
http://repository.iitr.ac.in/handle/123456789/1827
Issue Date: 2018
Publisher: Elsevier Ltd
Keywords: Height ratio
Square cylinder
Strouhal number
Tapered cylinder
Triangular cylinder
ISSN: 179310
Author Scopus IDs: 56394464500
8548369300
6505757951
Author Affiliations: Parveez, M., Department of Chemical Engineering, National Institute of Technology Srinagar, Hazratbal190 006, India
Dhiman, A.K., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Harmain, G.A., Department of Mechanical Engineering, National Institute of Technology Srinagar, Hazratbal190 006, India
Corresponding Author: Dhiman, A.K.; Department of Chemical Engineering, Indian Institute of Technology RoorkeeIndia; email: amitdfch@iitr.ac.in
Appears in Collections:Journal Publications [CH]

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