In this paper, the effects of uncertainties in physical properties on predicting entropy generation for a steady laminar flow of Al2O3–ethylene glycol nanofluid ( between two concentric rotating cylinders are investigated. For this purpose, six different models by combining of three relations for thermal conductivity (Bruggeman, Hamilton–Crosser, and Yu–Choi) and two relations for dynamic viscosity (Brinkman and Maiga et al.) are applied. The governing equations with reasonable assumptions in cylindrical coordinates are simplified and solved to obtain analytical expressions for average entropy generation and average Bejan number . The results show that, when the contribution of heat transfer to entropy generation for the base fluid is dominant, a critical radius ratio can be determined at which all six models predict the reduction in entropy generation with increases of volume fraction of nanoparticles. It is also found that, when the contribution of viscous effects to entropy generation is adequately high for the base fluid (), all models predict the increase of entropy generation with increases of particle loading.
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Forced Convection
Effect of Uncertainties in Physical Properties on Entropy Generation Between Two Rotating Cylinders With Nanofluids
Omid Mahian,
Omid Mahian
Young Researchers Club, Mashhad Branch,
e-mail: omid.mahian@gmail.com
Islamic Azad University
, Mashhad 15655/461, Iran
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Shohel Mahmud,
Shohel Mahmud
School of Engineering, University of Guelph
, Guelph, ON, N1G 2W1, Canada
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Saeed Zeinali Heris
Saeed Zeinali Heris
Department of Chemical Engineering,
Ferdowsi University of Mashhad
, Mashhad 91775-1111, Iran
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Omid Mahian
Young Researchers Club, Mashhad Branch,
Islamic Azad University
, Mashhad 15655/461, Iran
e-mail: omid.mahian@gmail.com
Shohel Mahmud
School of Engineering, University of Guelph
, Guelph, ON, N1G 2W1, Canada
Saeed Zeinali Heris
Department of Chemical Engineering,
Ferdowsi University of Mashhad
, Mashhad 91775-1111, Iran
J. Heat Transfer. Oct 2012, 134(10): 101704 (9 pages)
Published Online: August 7, 2012
Article history
Received:
November 24, 2011
Revised:
April 17, 2012
Online:
August 7, 2012
Published:
August 7, 2012
Citation
Mahian, O., Mahmud, S., and Zeinali Heris, S. (August 7, 2012). "Effect of Uncertainties in Physical Properties on Entropy Generation Between Two Rotating Cylinders With Nanofluids." ASME. J. Heat Transfer. October 2012; 134(10): 101704. https://doi.org/10.1115/1.4006662
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