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Technical Brief

Effects of Energy Dissipation and Variable thermal conductivity on Entropy Generation Rate in Mixed Convection Flow

[+] Author and Article Information
Muhammad Qasim

Department of Mathematics, COMSATS Institute of Information Technology, Park Road, Chak Shahzad, Islamabad, Pakistan
mq_qau@yahoo.com

Idrees Afridi

Department of Mathematics, COMSATS Institute of Information Technology, Park Road, Chak Shahzad, Islamabad, Pakistan
idreesafridi313@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4038703 History: Received April 25, 2017; Revised October 30, 2017

Abstract

Analysis of heat transfer and entropy generation in mixed convection flow over a vertically stretching sheet has been carried out in the presence of variable thermal conductivity and energy dissipation. Governing equations are reduced to self-similar ordinary differential equations via similarity transformations and are solved numerically by applying shooting and fourth order Runge-Kutta techniques. The expressions for entropy generation number and Bejan number are also obtained by using similarity transformations. The influence of embedding physical parameters on quantities of interest is discussed through graphical illustrations. The results reveal that entropy generation number increases significantly in the vicinity of stretching surface and gradually dies out as one moves away from the sheet. Also the entropy generation number decreases with an increase in temperature difference parameter. Moreover, entropy generation number enhances with an enhancement in the Eckert number, Prandtl number and variable thermal conductivity parameter.

Copyright (c) 2017 by ASME
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