Library Subscription: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

The Effect of Radiative Heat Transfer on Slip Flow through Parallel-Plate Microchannels

Get access (open in a dialog) DOI: 10.1615/IHTC15.fcv.009852
pages 3165-3177

Abstract

A wide range of applications in Micro-Electro-Mechanical systems (MEMS) has attracted many investigators in fluid flow and heat transfer in micro scale. As a continuation of ongoing research on this field, in the current study, thermal analysis of steady-state fully developed laminar gaseous flow in a parallel plate microchannel with two different constant heat fluxes at walls (asymmetrically heated walls) was considered. The rarefaction and viscous heating effects were also taken into consideration. The radiative heat transfer effect was examined through the inclusion of Rosseland approximation term in the energy equation. The first order slip velocity and temperature jump boundary conditions were implemented at the wall. Closed-form expressions were analytically obtained for temperature distributions and Nusselt number. The results indicate that increasing either Brinkman number or radiation parameter causes a decrease in heat transfer for the symmetrical wall heating case. Furthermore, Nusselt number of upper wall decreases with the radiation parameter and wall heat flux ratio, when the wall is exposed to asymmetric wall heating. On the other hand, increasing the radiation parameter results in an increase Nusselt number of lower wall beyond singularity points existing in this case, whereas it has a decreasing effect on Nusselt number of lower wall prior to these points.