THERMAL SCIENCE

International Scientific Journal

M. Y. Abdollahzadeh Jamalabadi

,

Jae Hyun Park

,

Chang Yeop Lee

THERMAL RADIATION EFFECTS ON THE ONSET OF UNSTEADINESS OF FLUID FLOW IN VERTICAL MICROCHANNEL FILLED WITH HIGHLY ABSORBING MEDIUM

ABSTRACT
This study presents the effect of thermal radiation on the steady flow in a vertical micro channel filled with highly absorbing medium. The governing equations (mass, momentum and energy equation with Rosseland approximation and slip boundary condition) are solved analytically. The effects of thermal radiation parameter, the temperature parameter, Reynolds number, Grashof number, velocity slip length, and temperature jump on the velocity and temperature profiles, Nusselt number, and skin friction coefficient are investigated. Results show that the skin friction and the Nusselt number are increased with increase in Grashof number, velocity slip, and pressure gradient while temperature jump and Reynolds number have an adverse effect on them. Furthermore, a criterion for the flow unsteadiness based on the temperature parameter, thermal radiation parameter, and the temperature jump is presented.
KEYWORDS
thermal radiation, rarefaction effects, mixed convection, micro channel, flow unsteadinesss
PAPER SUBMITTED: 2014-04-18
PAPER REVISED: 2014-10-29
PAPER ACCEPTED: 2014-11-08
PUBLISHED ONLINE: 2014-11-08
DOI REFERENCE: https://doi.org/10.2298/TSCI140418124A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE Issue 5, PAGES [1585 - 1596]
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Thermal radiation effects on the onset of unsteadiness of fluid flow in vertical microchannel filled with highly absorbing medium

© 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