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Simulation of gas flow in microchannels with a single 90 degrees bend

DSpace at IIT Bombay

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Title Simulation of gas flow in microchannels with a single 90 degrees bend
 
Creator AGRAWAL, A
DJENIDI, L
AGRAWAL, A
 
Subject lattice boltzmann method
gaseous slip-flow
long microchannels
square cylinders
pressure losses
laminar-flow
fluid-flows
microdevices
channels
elements
 
Description Bends are frequently encountered in microdevices and therefore a fundamental understanding of How through them is important. In this paper, we have used the lattice Boltzmann method to study flow of a gas through a microchannel with a single 90 degrees bend. The computations are two-dimensional, isothermal, and for the Reynolds and Knudsen numbers typically observed. We rind that the pressure drop in segments of equal lengths before and after the bend is different, and a recirculatory motion is seen near the bend even when the flow Reynolds number is less than unity. The velocity and pressure distribution between the bend and straight microchannels is almost identical at large Knudsen numbers, indicating that the flow does not feel the presence of the bend in such cases. This is attributed to rarefaction of the gas which hinders transfer of information across the now. (C) 2009
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-26T12:36:51Z
2011-12-26T12:57:26Z
2011-12-27T05:41:08Z
2011-08-26T12:36:51Z
2011-12-26T12:57:26Z
2011-12-27T05:41:08Z
2009
 
Type Article
 
Identifier COMPUTERS & FLUIDS, 38(8), 1629-1637
0045-7930
http://dx.doi.org/10.1016/j.compfluid.2009.01.004
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11309
http://hdl.handle.net/10054/11309
 
Language en