Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/807323

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Title
Simulation of gas flow in microchannels with a single 90° bend
Author/Creator
Agrawal, Abhishek;  Djenidi, Lyazid;  Agrawal, Amit
Institution
The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
Description
Bends are frequently encountered in microdevices and therefore a fundamental understanding of flow 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° bend. The computations are two-dimensional, isothermal, and for the Reynolds and Knudsen numbers typically observed. We find 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 flow.
Relation
Computers & Fluids Vol. 38, Issue 8, p. 1629-1637
Publisher Link
http://dx.doi.org/10.1016/j.compfluid.2009.01.004
Date
2009
Publisher
Elsevier
Keyword(s)
microchannels;  lattice Boltzmann method;  microdevices;  gas flow
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/807323
Identifier
ISSN:0045-7930
Reviewed
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Subject
"Computers & Fluids"
 
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