NDLI: Gas Microflows in the Slip Flow Regime: A Critical Review on Convective Heat Transfer

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Colin, Stéphane
Copyright Year	2012
Abstract	Accurate modeling of gas microvection is crucial for a lot of MEMS applications (microheat exchangers, pressure gauges, fluidic microactuators for active control of aerodynamic flows, mass flow and temperature microsensors, micropumps, and microsystems for mixing or separation for local gas analysis, mass spectrometers, vacuum, and dosing valves…). Gas flows in microsystems are often in the slip flow regime, characterized by a moderate rarefaction with a Knudsen number of the order of 10−2 –10−1 . In this regime, velocity slip and temperature jump at the walls play a major role in heat transfer. This paper presents a state of the art review on convective heat transfer in microchannels, focusing on rarefaction effects in the slip flow regime. Analytical and numerical models are compared for various microchannel geometries and heat transfer conditions (constant heat flux or constant wall temperature). The validity of simplifying assumptions is detailed and the role played by the kind of velocity slip and temperature jump boundary conditions is shown. The influence of specific effects, such as viscous dissipation, axial conduction and variable fluid properties is also discussed.
Starting Page	020908
Ending Page	020920
Page Count	13
File Format	PDF
ISSN	00221481
e-ISSN	15288943
Journal	Journal of Heat Transfer
Volume Number	134
Issue Number	2
DOI	10.1115/1.4005063
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	2011-12-19
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Boundary-value problems Convection Critical heat flux Energy dissipation Flow (Dynamics) Fluids Heat conduction Heat flux Heat transfer Heating Knudsen number Microchannels Slip flow Temperature Wall temperature
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering Mechanics of Materials Condensed Matter Physics Materials Science

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