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Entropy Generation Analysis for Microscale Forced Convection in Thermal Entrance Region

Published online by Cambridge University Press:  22 March 2012

V. Vandadi ,
A. Vandadi ,
H. Niazmand  and
C. Aghanajafi
V. Vandadi*
Affiliation:
Department of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran.
A. Vandadi
Affiliation:
Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
H. Niazmand
Affiliation:
Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
C. Aghanajafi
Affiliation:
Department of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran.
*
*Corresponding author (v.vandadi@gmail.com)
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Abstract

An analytical study on entropy generation considering viscous dissipation effect in the circular microchannel is reported. The fluid flow is steady, laminar, hydrodynamically fully developed and thermally developing. In the first law analysis, appropriate dimensionless variables are applied to solve the energy equation in the thermal entrance region of microchannel. Subsequently the obtained temperature field is used to derive an expression for entropy generation rate. The effect of Knudsen number and Brinkman number on the entropy generation rate and Bejan number in different axial location is presented.

Keywords

Entropy generationMicrochannelViscous dissipationGraetz

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Type
Articles
Information
Journal of Mechanics , Volume 28 , Issue 1 , March 2012 , pp. 71 - 76
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2012

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