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Convective heat transfer and second law analysis of non-Newtonian fluid flows with variable thermophysical properties in circular channels

Shojaeian, Mostafa and Yıldız, Mehmet and Koşar, Ali (2015) Convective heat transfer and second law analysis of non-Newtonian fluid flows with variable thermophysical properties in circular channels. International Communications in Heat and Mass Transfer, 60 . pp. 21-31. ISSN 0735-1933 (Print) 1879-0178 (Online)

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Official URL: http://dx.doi.org/10.1016/j.icheatmasstransfer.2014.12.002

Abstract

This study presents an analytical solution, for fully developed non-Newtonian fluid flows in circular channels under isoflux thermal boundary conditions based on perturbation techniques. Since the physical properties are generally a function of temperature and may not be assumed constant under certain circumstances, the change in viscosity and thermal conductivity with temperature was taken into account Viscous dissipation term was also included in the performed analysis. In this study, first closed form expressions for velocity, temperature distributions, and Nusselt numbers corresponding to constant thermophysical properties were given in terms of governing parameters. Then, numerical calculation was performed to obtain the values of Nusselt number and global entropy generation for variable thermophysical properties. The results revealed that neglecting the property variation significantly affects heat transfer characteristics and entropy generation, in which the deviation from the constant physical property assumption may reach up to about 32.6%.

Item Type:Article
Uncontrolled Keywords:Thermophysical properties; Non-Newtonian flow; Nusselt number; Viscous heating
Subjects:T Technology > TJ Mechanical engineering and machinery
T Technology > TP Chemical technology > TP0200-248 Chemicals: Manufacture, use, etc.
ID Code:26843
Deposited By:Ali Koşar
Deposited On:20 May 2015 10:22
Last Modified:20 May 2015 10:22

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