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research-article

3D Numerical Investigation of Thermodynamic Performance due to Conjugate Natural Convection from Horizontal Cylinder with Annular Fins

[+] Author and Article Information
Jnana Ranjan Senapati

Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, India-721302
jnanabharat270@gmail.com

Sukanta Kumar Dash

Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, India-721302
sdash@mech.iitkgp.ernet.in

Subhransu Roy

Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, India-721302
suroy@mech.iitkgp.ernet.in

1Corresponding author.

ASME doi:10.1115/1.4035968 History: Received September 05, 2016; Revised January 25, 2017

Abstract

Entropy generation due to natural convection has been computed for a wide range of Rayleigh number based on fin spacing, RaS in the entire laminar range 5 ≤ RaS ≤ 108, for diameter ratio, 2 ≤ D/d ≤ 5 for an isothermal horizontal cylinder fitted with vertical annular fins. Entropy generation in the tube-fin system is predominantly due to heat transfer rather than of fluid friction. The results demonstrate that the degree of irreversibility is higher in case of finned configuration when compared with unfinned one. With the deployment of a merit function combining the first and second laws of thermodynamics, we have tried to show the thermodynamic performance of finned cylinder with natural convection. So, we have defined the ratio (I/Q)finned/(I/Q)unfinned. The ratio (I/Q)finned/(I/Q)unfinned gets its minimum value at optimum fin spacing where heat transfer is maximum. A detailed view of the entropy generation around the finned cylinder has been shown for various S/d at a particular D/d and Rayleigh number, which explains the nature and reason of entropy production.

Copyright (c) 2017 by ASME
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