Record Details

Laminar gas micro-flow convection characteristics due to steep density gradients

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Laminar gas micro-flow convection characteristics due to steep density gradients
 
Creator MAHULIKAR, SP
HERWIG, H
HAUSNER, O
KOCK, F
 
Subject microchannels
capillary
systems
mems
 
Description We report numerical simulation of pure continuum-based laminar gas micro-flow convection with steep density gradients, which cause, for the case of heated air, flattening and rate of flattening of axial velocity profile. This flattening is similar to the characteristics in constant-properties slip flow, and high rate of flattening can cause hydrodynamic undevelopment of flow-the reverse process of hydrodynamic development. By continuity, radially outward velocities and radial convection are induced, which degrades convection performance. The low densities near the wall reduce the axial mass flux near the wall, which also degrades convection performance. In heated-gas micro-flows, these negative effects dominate to dictate the net convection characteristics, which differ considerably from the known characteristics of conventional continuum models. The identification of such microscale effects also has implications in possibly extending the limits of applicability of continuum models to higher Knudsen numbers.
 
Publisher E D P SCIENCES
 
Date 2011-07-21T12:02:00Z
2011-12-26T12:52:00Z
2011-12-27T05:38:52Z
2011-07-21T12:02:00Z
2011-12-26T12:52:00Z
2011-12-27T05:38:52Z
2004
 
Type Article
 
Identifier EUROPHYSICS LETTERS, 68(6), 811-817
0295-5075
http://dx.doi.org/10.1209/epl/i2004-10296-0
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5861
http://hdl.handle.net/10054/5861
 
Language en