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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/1853
Title: Transition to periodic unsteady and effects of Prandtl and Richardson numbers on the flow across a confined heated trapezoidal prism
Authors: Parveez M.
Dhiman, Amit Kumar
Rasool T.
Published in: Journal of the Brazilian Society of Mechanical Sciences and Engineering
Abstract: The effects of wall confinements (?) and of Prandtl numbers (Pr) on the laminar flow around a heated trapezoidal prism are investigated numerically for Pr = 0.71–100 and ? = 12.5–50 % at low Reynolds numbers (Re). The critical value of the Reynolds number (i.e., the transition from a steady to a time-periodic regime) is calculated and it exists between Re = (36 and 37), (60 and 61) and (91 and 92) for the blockage ratios of 12.5, 25 and 50 %, respectively. The average Nusselt number increases with increasing Re and/or Pr and/or blockage ratio. The variation of local Nusselt number on each surface of the obstacle and the representative isotherm contours are presented to elucidate the role of Pr and blockage ratio on the heat transfer from the trapezoidal prism. The maximum heat transfer enhancement with respect to a square prism on the basis of equal projected area is found to be approximately 31 and 45 % for the blockage ratios of 12.5 and 25 %, respectively, for Pr = 0.71 and Re = 1. The Colburn heat transfer factor correlations are also obtained for the preceding range of settings. Finally, the influence of Richardson number (Ri = 0–1) on the flow and heat transfer characteristics has been studied for air as working fluid. © 2014, The Brazilian Society of Mechanical Sciences and Engineering.
Citation: Journal of the Brazilian Society of Mechanical Sciences and Engineering (2015), 37(4): 1291-1307
URI: https://doi.org/10.1007/s40430-014-0258-4
http://repository.iitr.ac.in/handle/123456789/1853
Issue Date: 2015
Publisher: Springer Verlag
Keywords: Blockage ratio
Critical Reynolds number
Nusselt number
Richardson number
The Colburn heat transfer factor and heat transfer enhancement
Trapezoidal prism
ISSN: 16785878
Author Scopus IDs: 56394464500
8548369300
56394290900
Author Affiliations: Parveez, M., 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
Rasool, T., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Corresponding Author: Dhiman, A.; Department of Chemical Engineering, Indian Institute of Technology RoorkeeIndia
Appears in Collections:Journal Publications [CH]

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