Effect of thermal asymmetries on the entropy generation analysis of a variable viscosity Couette-Poiseuille flow
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Publication Details
Author list: Mondal P.K., Gaikwad H., Kundu P.K., Wongwises S.
Publisher: SAGE Publications
Publication year: 2017
Journal: Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering (0954-4089)
Volume number: 231
Issue number: 5
Start page: 1011
End page: 1024
Number of pages: 14
ISSN: 0954-4089
eISSN: 2041-3009
Languages: English-Great Britain (EN-GB)
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Abstract
The influence of viscous dissipation on forced convective heat transfer and entropy generation rate in the conduction limit for a variable-viscosity flow between asymmetrically heated parallel plates is studied in an analytical framework consistent with perturbation method. The study considers a flow of Newtonian fluid under the simultaneous action of an applied pressure gradient and an axial movement of the upper plate. The present study emphasizes on the effect of dissipative heat produced by the movable upper plate as well as viscous heating generated due to applied pressure gradient on the underlying thermo-hydrodynamic transport. A few non-dimensional parameters such as dimensionless upper plate velocity, degree of asymmetry parameter and Brinkman number have been defined and their influential role on the variation of temperature profile, the Nusselt number and entropy generation number has been discussed in detail. The study shows that the variation of Nusselt number exhibits an unbounded swing, which, in turn, leads to appearance of the point of singularities at some cases of asymmetrical plate heating. Finally, the source of appearance of point of singularities has been discussed in view of the energy balance, and from the second-law analysis of thermodynamics. ฉ Institution of Mechanical Engineers.
Keywords
asymmetry parameter, Brinkman number, second-law analysis, Variable-viscosity
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