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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/1828
Title: Aiding buoyancy driven flow and heat transfer features of converging and diverging trapezoidal cylinders
Authors: Parveez M.
Dhiman, Amit Kumar
Harmain G.A.
Published in: Sadhana - Academy Proceedings in Engineering Sciences
Abstract: Numerical computations have been carried out to explore the influence of mixed convection heat transfer from heated trapezoidal geometries of two different configurations namely converging and diverging cylinders in a vertical domain. The recirculation length of the diverging cylinder is found to be more than that of the converging cylinder for all values of Re (5 to 40) considered in this study and this length decreases after introducing buoyancy effect. Drag coefficients decrease with increase in Re for a fixed Ri. However, drag increases for the increasing values of Ri (values considered up to 1). The drag coefficient is found to be the smaller for diverging cylinder than that of converging one. Local Nusselt number shows significant increase as Re and Ri values increase, which results in enhanced heat transfer. Keeping Ri fixed and increasing the value of Re results in the augmentation of heat transfer and is around 15% at Re = 5 and 23% at Re = 40 for Ri = 0 for a square cylinder with respect to diverging cylinder. Under the influence of aiding buoyancy, the values of average Nusselt number (Nu¯) for the diverging cylinder are higher compared to that of converging cylinder. A correlation expressing functional relationship of Nu¯ with Re and Ri has also been generated. © 2018, Indian Academy of Sciences.
Citation: Sadhana - Academy Proceedings in Engineering Sciences (2018), 43(8): -
URI: https://doi.org/10.1007/s12046-018-0862-6
http://repository.iitr.ac.in/handle/123456789/1828
Issue Date: 2018
Publisher: Springer
Keywords: aiding buoyancy
converging cylinder
Diverging cylinder
drag coefficients
Nusselt numbers
ISSN: 2562499
Author Scopus IDs: 56394464500
8548369300
6505757951
Author Affiliations: Parveez, M., Department of Chemical Engineering, National Institute of Technology Srinagar, Hazratbal, 190 006, India
Dhiman, A., 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, Hazratbal, 190 006, India
Corresponding Author: Dhiman, A.; Department of Chemical Engineering, Indian Institute of Technology RoorkeeIndia; email: amitdfch@iitr.ac.in
Appears in Collections:Journal Publications [CH]

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