28TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2012 , 2012-07-09

Title : ( Effects of thermal creep and high order slip/jump on natural convection in microchannels )

Authors: Behnam Rahimi , Hamid Niazmand ,

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Abstract

Natural convection gaseous slip flows in open-ended vertical parallel-plate microchannels with symmetric wall heat fluxes are numerically investigated. A second-order model, including thermal creep effects, is considered for velocity slip and temperature jump boundary conditions with variable thermo-physical properties. Simulations are performed for wide range of Rayleigh numbers from 5 × 10−6 to 5 × 10−3 in the continuum to slip flow regime. The developing and fully developed solutions are examined by solving the Navier-Stokes and energy equations using a control volume technique. It is found that the second order effects reduce the temperature jump and the slip velocity, whereas thermal creep strongly increases the slip velocity in both developing and fully developed regions. Moreover, the rarefaction effects increase the flow and heat transfer rates considerably.

Keywords

, Natural convection, Rarefied gas flows, Thermal creep, Slip/Jump.
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@inproceedings{paperid:1031279,
author = {Rahimi, Behnam and Niazmand, Hamid},
title = {Effects of thermal creep and high order slip/jump on natural convection in microchannels},
booktitle = {28TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2012},
year = {2012},
location = {Zaragoza},
keywords = {Natural convection; Rarefied gas flows; Thermal creep; Slip/Jump.},
}

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%0 Conference Proceedings
%T Effects of thermal creep and high order slip/jump on natural convection in microchannels
%A Rahimi, Behnam
%A Niazmand, Hamid
%J 28TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2012
%D 2012

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