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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/1838
Title: A comparative study on cross-buoyancy mixed convection around expanded and tapered trapezoidal bluff bodies
Authors: Verma V.K.
Dhiman, Amit Kumar
Published in: Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering
Abstract: Numerical computations have been realized to explore and evaluate the laminar mixed convection heat transfer from a heated trapezoidal bluff body. Two different configurations of the trapezoidal bluff body viz. expanded and tapered considered and a comparison has been made at different operational parameters. The spectrum of physical control parameters considered as Reynolds number (Re) = 10-50, Richardson number (Ri) = 0-1, and Prandtl number (Pr) = 0.7 (air). A finite volume method implemented on the collocated grid arrangement has been employed for numerical computations. Overall drag and lift coefficients are found higher for a tapered body as compared to an expanded body. However, average Nusselt number is greater for the expanded body as compared to the tapered one. With increase in Re at a given Ri, total drag coefficient is found to decrease in steady regime, but it increases in time-periodic regime. On increasing Ri, drag and lift coefficients decrease in the steady regime for both geometries. A correlation expressing the functional relationship of average Nusselt number with Re and Ri for both geometries has been proposed. Critical Re at Ri = 0.5 for the expanded geometry is found to be between Re = 46 and 47, while for the tapered body it exists between Re = 35 and 36. Maximum heat transfer enhancement for the tapered body with respect to the expanded body at Ri = 0, 0.5, and 1 is found to be approximately 26, 24, and 21%, respectively. © 2017 Institution of Mechanical Engineers.
Citation: Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering (2017), 231(3): 513-532
URI: https://doi.org/10.1177/0954408915611862
http://repository.iitr.ac.in/handle/123456789/1838
Issue Date: 2017
Publisher: SAGE Publications Ltd
Keywords: critical Reynolds number
cross-buoyancy
expanded bluff body
heat transfer enhancement
Tapered bluff body
ISSN: 9544089
Author Scopus IDs: 57213651644
8548369300
Author Affiliations: Verma, V.K., 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
Corresponding Author: Dhiman, A.; Department of Chemical Engineering, Indian Institute of Technology RoorkeeIndia; email: dhimuamit@rediffmail.com
Appears in Collections:Journal Publications [CH]

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