IMPROVING DSMC WITH NEW PRESSURE BOUNDARY CONDITIONS FOR HEAT AND MASS TRANSFER OF MICROCHANNEL FLOWS

A new treatment of pressure boundary conditions for the DSMC method is proposed for flow prediction in microchannels. Validity and accuracy of the new method are verified by comparing to the analytical solutions of the micro-Poiseuille flow under slip condition. The new method shows better convergen...

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Bibliographic Details
Published in:Nanoscale and microscale thermophysical engineering 2009-04, Vol.13 (2), p.165
Main Authors: Yang, Jian, Ye, Jianjun, Zheng, Jinyang, Wong, Ieong, Ma, Yanbao, Lam, Chik, Link, Shmuel
Format: Article
Language:English
Subjects:
Accuracy
Heat transfer
Methods
Temperature
Validity
Online Access:Get full text
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Summary:A new treatment of pressure boundary conditions for the DSMC method is proposed for flow prediction in microchannels. Validity and accuracy of the new method are verified by comparing to the analytical solutions of the micro-Poiseuille flow under slip condition. The new method shows better convergence compared with previous boundary treatments. This advantage becomes more remarkable as the geometry of the microchannel becomes more complex. A study on a microchannel with sudden expansion is demonstrated using the new DSMC method. Wall temperature in the expanded region of the microchannel independently varies from 200 to 800 K to study the effects on the pressure distribution, velocity, mass flow rate, and heat flux of the microchannel flow. The results show that the wall temperature in the expanded region significantly affects the microchannel flow. Some unique phenomena are observed to be quite different from those of the macroscopic flow and the mechanism of these interesting phenomena is discussed. [PUBLICATION ABSTRACT]
ISSN:1556-7265
1556-7273