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ISSN Online: 2377-424X

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

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

DSMC Study on the Rarefied Gaseous Heat Transfer in Annulus Heated by Nonuniform Heat Flux

Get access (open in a dialog) DOI: 10.1615/IHTC15.sol.008681
pages 7623-7631

要約

The characteristics of rarefied gaseous heat transfer under nonuniform heat flux condition in a twodimensional annulus simplified from the parabolic trough solar vacuum tubular collector are simulated by direct simulation Monte Carlo method. The temperature of the heated wall is iteratively updated by a relaxation style. We investigate the effect of the pressure in annulus on the characteristics of heat transfer and gaseous motion under uniform and nonuniform heat flux boundary conditions. The local gasous motion and its effect on the overall heat transfer characteristics with nonuniform heat flux boundary condition is further analyzed. Our simulations indicate that local gaseous motion will be driven by the local temperature gradients under the given nonuniform heat flux boundary condition when the pressure in annulus is low. The strength of local motion will also be influenced by the pressure in annulus. However, the local gaseous motion has slight influence on the gaseous heat transfer in annular gap because of its weak strength.