Evaluation of Heat Irreversibility in Couple Stress Falling Liquid Films along Heated Inclined Substrate
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Date
2019
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Publisher
Journal of Cleaner Production
Abstract
In the present work, the analysis of entropy generation in a gravity-aided thin couple stress
liquid film in an inclined heated substrate is investigated. The thin substrate layer is assumed to be
porous and governed by Darcy law. Exact solutions of the dimensionless field equations are obtained
and used to determine the rate of entropy is produced along the inclined plate. Velocity, temperature,
entropy generation and Bejan profiles are presented for different parameter cases. The result of the
analysis revealed the significance of both slip and porous permeability parameters on entropy
generation rate and the effects of both modified Navier slip and porous permeability parameters on the
entropy generation rate turns out to be large at the free surface of the porous substrate and must be
controlled for sustainable and efficient production.
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Keywords
Couple stress film, Entropy generation, Energy conservation, Inclined substrate