Entropy generation due to natural convection has been computed for a wide range of Rayleigh numbers based on fin spacing, RaS in the entire laminar range , and 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 fluid friction. The results demonstrate that the degree of irreversibility is higher in the case of the finned configuration when compared with the 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 which 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 (fin spacing to tube diameter ratio) at a particular D/d (fin to tube diameter ratio) and Rayleigh number, which explains the nature and reason of entropy production.
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Three-Dimensional Numerical Investigation of Thermodynamic Performance Due to Conjugate Natural Convection From Horizontal Cylinder With Annular Fins
Jnana Ranjan Senapati,
Jnana Ranjan Senapati
Department of Mechanical Engineering,
Indian Institute of Technology Kharagpur,
Kharagpur 721302, India
e-mail: jnanabharat270@gmail.com
Indian Institute of Technology Kharagpur,
Kharagpur 721302, India
e-mail: jnanabharat270@gmail.com
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Sukanta Kumar Dash,
Sukanta Kumar Dash
Department of Mechanical Engineering,
Indian Institute of Technology Kharagpur,
Kharagpur 721302, India
Indian Institute of Technology Kharagpur,
Kharagpur 721302, India
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Subhransu Roy
Subhransu Roy
Department of Mechanical Engineering,
Indian Institute of Technology Kharagpur,
Kharagpur 721302, India
Indian Institute of Technology Kharagpur,
Kharagpur 721302, India
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Jnana Ranjan Senapati
Department of Mechanical Engineering,
Indian Institute of Technology Kharagpur,
Kharagpur 721302, India
e-mail: jnanabharat270@gmail.com
Indian Institute of Technology Kharagpur,
Kharagpur 721302, India
e-mail: jnanabharat270@gmail.com
Sukanta Kumar Dash
Department of Mechanical Engineering,
Indian Institute of Technology Kharagpur,
Kharagpur 721302, India
Indian Institute of Technology Kharagpur,
Kharagpur 721302, India
Subhransu Roy
Department of Mechanical Engineering,
Indian Institute of Technology Kharagpur,
Kharagpur 721302, India
Indian Institute of Technology Kharagpur,
Kharagpur 721302, India
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received September 5, 2016; final manuscript received January 25, 2017; published online April 11, 2017. Assoc. Editor: Debjyoti Banerjee.
J. Heat Transfer. Aug 2017, 139(8): 082501 (7 pages)
Published Online: April 11, 2017
Article history
Received:
September 5, 2016
Revised:
January 25, 2017
Citation
Senapati, J. R., Dash, S. K., and Roy, S. (April 11, 2017). "Three-Dimensional Numerical Investigation of Thermodynamic Performance Due to Conjugate Natural Convection From Horizontal Cylinder With Annular Fins." ASME. J. Heat Transfer. August 2017; 139(8): 082501. https://doi.org/10.1115/1.4035968
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