The entropy generation due to mixed convective heat transfer of nanofluids past a rotating circular cylinder placed in a uniform cross stream is investigated via streamline upwind Petrov–Galerkin based finite element method. Nanosized copper (Cu) particles suspended in water are used with Prandtl number (Pr) = 6.9. The computations are carried out at a representative Reynolds number (Re) of 100. The dimensionless cylinder rotation rate, α, is varied between 0 and 2. The range of nanoparticle volume fractions (ϕ) considered is 0 ≤ ϕ ≤ 5%. Effect of aiding buoyancy is brought about by considering two fixed values of the Richardson number (Ri) as 0.5 and 1.0. A new model for predicting the effective viscosity and thermal conductivity of dilute suspensions of nanoscale colloidal particles is presented. The model addresses the details of the agglomeration–deagglomeration in tune with the pertinent variations in the effective particulate dimensions, volume fractions, as well as the aggregate structure of the particulate system. The total entropy generation is found to decrease sharply with cylinder rotation rates and nanoparticle volume fractions. Increase in nanoparticle agglomeration shows decrease in heat transfer irreversibility. The Bejan number falls sharply with increase in α and ϕ.
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Indian Institute of Science Bangalore,
Tata Steel Ltd.,
e-mail: suva_112@yahoo.co.in
Indian Institute of Technology,
Guwahati,
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Research-Article
Analysis of Entropy Generation During Mixed Convective Heat Transfer of Nanofluids Past a Rotating Circular Cylinder
Sandip Sarkar,
Indian Institute of Science Bangalore,
Sandip Sarkar
Department of Mechanical Engineering
,Indian Institute of Science Bangalore,
Bangalore 560012
, India
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Suvankar Ganguly,
Tata Steel Ltd.,
e-mail: suva_112@yahoo.co.in
Suvankar Ganguly
1
Research and Development Division
,Tata Steel Ltd.,
Jamshedpur 831007
, India
e-mail: suva_112@yahoo.co.in
1Corresponding author.
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Amaresh Dalal
Indian Institute of Technology,
Guwahati,
Amaresh Dalal
Department of Mechanical Engineering
,Indian Institute of Technology,
Guwahati,
Guwahati 781039
, India
Search for other works by this author on:
Sandip Sarkar
Department of Mechanical Engineering
,Indian Institute of Science Bangalore,
Bangalore 560012
, India
Suvankar Ganguly
Research and Development Division
,Tata Steel Ltd.,
Jamshedpur 831007
, India
e-mail: suva_112@yahoo.co.in
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 June 22, 2013; final manuscript received January 2, 2014; published online March 7, 2014. Assoc. Editor: Giulio Lorenzini.
J. Heat Transfer. Jun 2014, 136(6): 062501 (10 pages)
Published Online: March 7, 2014
Article history
Received:
June 22, 2013
Revision Received:
January 2, 2014
Citation
Sarkar, S., Ganguly, S., and Dalal, A. (March 7, 2014). "Analysis of Entropy Generation During Mixed Convective Heat Transfer of Nanofluids Past a Rotating Circular Cylinder." ASME. J. Heat Transfer. June 2014; 136(6): 062501. https://doi.org/10.1115/1.4026470
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