Entropy generation is squarely linked with irreversibility, and consequently with exergy destruction within a thermal system. This study concerns with the temperature distribution, and local and volumetric averaged entropy generation rates within a cylindrical system with two solid co-rotating inner and outer parts and the middle nanofluid flow part. Temperature-dependent thermal conductivities for solid materials are included within the modeling. To obtain the temperature formula within all three sections, a combined analytical–numerical solution technique is applied. An exact analytical solution is also obtained, when constant thermal conductivities for solid materials are assumed. The resultant data from the analytical–numerical solution technique is verified against the investigated exact solution. Thereafter, the velocity and temperature fields from the combined analytical–numerical solution technique are incorporated into the entropy generation formulations to obtain the local and volumetric averaged entropy generation rates. Using abovementioned procedure, the effects of thermophysical parameters such as nanoparticles volume concentration, Brinkman number, thermal conductivity parameter ratios, outer temperature boundary condition, internal heat generation rates and velocity ratios on the temperature field, and entropy generation rates are investigated.
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Research-Article
Temperature and Entropy Generation Analyses Between and Inside Rotating Cylinders Using Copper–Water Nanofluid
Mohsen Torabi,
Mohsen Torabi
1
Department of Mechanical
and Biomedical Engineering,
Kowloon,
e-mail: Torabi_mech@yahoo.com; mohsen.torabi@my.cityu.edu.hk
and Biomedical Engineering,
City University of Hong Kong
,83 Tat Chee Avenue
, Kowloon,
Hong Kong
e-mail: Torabi_mech@yahoo.com; mohsen.torabi@my.cityu.edu.hk
1Corresponding author.
Search for other works by this author on:
Kaili Zhang,
Kaili Zhang
Department of Mechanical
and Biomedical Engineering,
Kowloon,
and Biomedical Engineering,
City University of Hong Kong
,83 Tat Chee Avenue
, Kowloon,
Hong Kong
Search for other works by this author on:
Shohel Mahmud
Shohel Mahmud
School of Engineering,
University of Guelph
,Guelph, ON N1G 2W1
, Canada
Search for other works by this author on:
Mohsen Torabi
Department of Mechanical
and Biomedical Engineering,
Kowloon,
e-mail: Torabi_mech@yahoo.com; mohsen.torabi@my.cityu.edu.hk
and Biomedical Engineering,
City University of Hong Kong
,83 Tat Chee Avenue
, Kowloon,
Hong Kong
e-mail: Torabi_mech@yahoo.com; mohsen.torabi@my.cityu.edu.hk
Kaili Zhang
Department of Mechanical
and Biomedical Engineering,
Kowloon,
and Biomedical Engineering,
City University of Hong Kong
,83 Tat Chee Avenue
, Kowloon,
Hong Kong
Shohel Mahmud
School of Engineering,
University of Guelph
,Guelph, ON N1G 2W1
, Canada
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received August 8, 2014; final manuscript received December 30, 2014; published online February 3, 2015. Assoc. Editor: Robert D. Tzou.
J. Heat Transfer. May 2015, 137(5): 051701 (10 pages)
Published Online: May 1, 2015
Article history
Received:
August 8, 2014
Revision Received:
December 30, 2014
Online:
February 3, 2015
Citation
Torabi, M., Zhang, K., and Mahmud, S. (May 1, 2015). "Temperature and Entropy Generation Analyses Between and Inside Rotating Cylinders Using Copper–Water Nanofluid." ASME. J. Heat Transfer. May 2015; 137(5): 051701. https://doi.org/10.1115/1.4029596
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