THERMAL SCIENCE

International Scientific Journal

Abuzar Ghaffari

,

Waqar Ahamed Khan

,

Irfan Mustafa

EFFECTS OF GASEOUS SLIP FLOW AND TEMPERATURE JUMP ON ENTROPY GENERATION RATE IN RECTANGULAR MICRODUCTS

ABSTRACT
In this study, the influence of slip flow and temperature jump on the entropy generation rate are investigated in rectangular microducts. The Knudsen numbers are considered in the range between 0.001 and 0.1, and the aspect ratio lies between 0 and 1. The dimensionless governing equations are solved numerically using Chebyshev spectral collocation method, and the dimensionless velocity and temperature gradients are employed in the entropy generation model. The influences of the dimensionless numbers including Bejan number and irreversibility distribution ratio on the entropy generation rates are investigated and discussed through surface plots and contour diagrams. It is demonstrated that the minimum entropy generation rate exists corresponding to an optimal aspect ratio for each dimensionless number. This minimum entropy generation rate depends upon the nature of dimensionless numbers.
KEYWORDS
Knudsen number, Bejan number, entropy generation rate, irreversibility, microducts, slip flow
PAPER SUBMITTED: 2018-11-15
PAPER REVISED: 2019-01-07
PAPER ACCEPTED: 2019-01-11
PUBLISHED ONLINE: 2019-02-17
DOI REFERENCE: https://doi.org/10.2298/TSCI181115029G
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Issue 5, PAGES [3001 - 3011]
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Effects of gaseous slip flow and temperature jump on entropy generation rate in rectangular microducts

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence