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# Second Law Analysis of Boundary Layer Flow With Variable Fluid Properties

[+] Author and Article Information
M. I. Afridi

Department of Mathematics,
COMSATS Institute of Information Technology,
e-mail: idreesafridi313@gmail.com

M. Qasim

Department of Mathematics,
COMSATS Institute of Information Technology,

O. D. Makinde

Faculty of Military Science,
Stellenbosch University,
Private Bag X2,
Saldanha 7395, South Africa

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 6, 2016; final manuscript received April 26, 2017; published online June 1, 2017. Assoc. Editor: George S. Dulikravich.

J. Heat Transfer 139(10), 104505 (Jun 01, 2017) (6 pages) Paper No: HT-16-1632; doi: 10.1115/1.4036645 History: Received October 06, 2016; Revised April 26, 2017

## Abstract

An entropy generation analysis of steady boundary layer flow of viscous fluid with variable properties over an exponentially stretching sheet is presented. The basic nonlinear partial differential equations that govern the flow are reduced to ordinary differential equations by using appropriate transformations. Numerical solutions are obtained by using shooting technique along with Runge–Kutta method. Expressions for the dimensionless volumetric entropy generation rate $(NG)$ and Bejan number are also obtained. The effects of different dimensionless emerging parameters on entropy generation number $(NG)$ and Bejan number $(Be)$ are investigated graphically in detail.

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## References

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## Figures

Fig. 1

Physical flow model and coordinate system

Fig. 2

(a) Variation of entropy generation number NG with ε, (b) variation of entropy generation number NG with Pr, (c) variation of entropy generation number NG with Ec, (d) variation of entropy generation number NG with δ, and (e) variation of entropy generation number NG withΩ

Fig. 3

(a) Variation of Bejan number Be with ε, (b) variation of Bejan number Be with Pr, (c) variation of Bejan number Be with Ec, (d) variation of Bejan number Be with δ, and (e) variation of Bejan number Be with Ω

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