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Three-dimensional simulation of gaseous slip flow in different aspect ratio microducts

DSpace at IIT Bombay

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Title Three-dimensional simulation of gaseous slip flow in different aspect ratio microducts
 
Creator AGRAWAL, A
AGRAWAL, A
 
Subject lattice boltzmann method
fluid-flows
microchannel flows
gas-flow
mems
 
Description Three-dimensional lattice Boltzmann method based simulations of a microduct have been undertaken in this paper. The objectives are to understand the different physical phenomena occurring at these small scales and to investigate when the flow can be treated as two dimensional. Toward this end, the Knudsen number and aspect ratio (depth to width ratio) are varied for a fixed pressure ratio. The pressure in the microduct is nonlinear with the nonlinearity in pressure reducing with an increase in the Knudsen number. The pressure behaves somewhat similar to two-dimensional microchannels, even when the aspect ratio is unity. The slip velocity at the impenetrable wall has two components: along and perpendicular to the primary flow direction. Our results show that the streamwise velocity near the centerline is relatively invariant along the depth for an aspect ratio of more than three, suggesting that the microduct can be modeled as a two-dimensional microchannel. On the other hand, the velocity component along the depth is never identically zero, implying that the flow is not truly two dimensional, although for practical purposes a two-dimensional treatment might suffice. A curious change in the vector direction in a plane normal to the flow direction is observed around an aspect ratio of four. These three-dimensional results are significant because they will help in theoretical development and flow modeling at microscales. (c) 2006
 
Publisher AMER INST PHYSICS
 
Date 2011-07-16T18:05:21Z
2011-12-26T12:49:53Z
2011-12-27T05:35:41Z
2011-07-16T18:05:21Z
2011-12-26T12:49:53Z
2011-12-27T05:35:41Z
2006
 
Type Article
 
Identifier PHYSICS OF FLUIDS, 18(10), -
1070-6631
http://dx.doi.org/10.1063/1.2354546
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4488
http://hdl.handle.net/10054/4488
 
Language en