The present work demonstrates entropy generation due to laminar mixed convection of water-based nanofluid past a square cylinder in vertically upward flow. Streamline upwind Petrov–Galerkin (SUPG) based finite element method is used for numerical simulation. Nanosized copper (Cu) and alumina (Al2O3) particles suspended in water are used with Prandtl number (Pr) = 6.2. The range of nanoparticle volume fractions considered is 0–20%. Computations are carried out at a representative Reynolds number (Re) of 100 with Richardson number (Ri) range −0.5 < Ri < 0.5, both values inclusive. For both the nanofluids (Al2O3–water and Cu–water nanofluids), total entropy generation decreases with increasing nanoparticle volume fractions. It is found that for the present case of mixed convection flows with nanofluids, thermal irreversibility is much higher than that of frictional irreversibility. The Bejan number decreases with increasing nanoparticle volume fractions.
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December 2012
This article was originally published in
Journal of Heat Transfer
Research-Article
Analysis of Entropy Generation During Mixed Convective Heat Transfer of Nanofluids Past a Square Cylinder in Vertically Upward Flow
Suvankar Ganguly,
Suvankar Ganguly
1
e-mail: suva_112@yahoo.co.in
Research and Development Division,
Research and Development Division,
Tata Steel Ltd.
,Jamshedpur 831001
, India
1Corresponding author.
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Amaresh Dalal
Amaresh Dalal
Department of Mechanical Engineering,
Indian Institute of Technology
,Guwahati, Guwahati 781039
, India
Search for other works by this author on:
Suvankar Ganguly
e-mail: suva_112@yahoo.co.in
Research and Development Division,
Research and Development Division,
Tata Steel Ltd.
,Jamshedpur 831001
, India
Amaresh Dalal
Department of Mechanical Engineering,
Indian Institute of Technology
,Guwahati, Guwahati 781039
, India
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 13, 2011; final manuscript received August 1, 2012; published online October 5, 2012. Assoc. Editor: Giulio Lorenzini.
J. Heat Transfer. Dec 2012, 134(12): 122501 (8 pages)
Published Online: October 5, 2012
Article history
Received:
October 13, 2011
Revision Received:
August 1, 2012
Citation
Sarkar, S., Ganguly, S., and Dalal, A. (October 5, 2012). "Analysis of Entropy Generation During Mixed Convective Heat Transfer of Nanofluids Past a Square Cylinder in Vertically Upward Flow." ASME. J. Heat Transfer. December 2012; 134(12): 122501. https://doi.org/10.1115/1.4007411
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