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Pressure drop and heat transfer characteristics of boiling water in sub-hundred micron channel

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Title Pressure drop and heat transfer characteristics of boiling water in sub-hundred micron channel
 
Creator BHIDE, RR
SINGH, SG
SRIDHARAN, A
DUTTAGUPTA, SP
AGRAWAL, A
 
Subject 2-phase flow
parallel microchannels
silicon microchannels
transfer model
phase-change
mass flux
part i
sinks
temperature
evaporation
microchannel
two phase flow
pressure drop
heat transfer coefficient
instability
surface roughness
 
Description The current work focuses on the pressure drop, heat transfer and stability in two phase flow in microchannels with hydraulic diameter of less than one hundred microns. Experiments were conducted in smooth microchannels of hydraulic diameter of 45, 65 mu m, and a rough microchannel of hydraulic diameter of 70 mu m, with deionised water as the working fluid. The local saturation pressure and temperature vary substantially over the length of the channel. In order to correctly predict the local saturation temperature and subsequently the heat transfer characteristics, numerical techniques have been used in conjunction with the conventional two phase pressure drop models. The Lockhart-Martinelli (liquid-laminar, vapour-laminar) model is found to predict the two phase pressure drop data within 20%. The instability in two phase flow is quantified; it is found that microchannels of smaller hydraulic diameter have lesser instabilities as compared to their larger counterparts. The experiments also suggest that surface characteristics strongly affect flow stability in the two phase flow regime. The effect of hydraulic diameter and surface characteristics on the flow characteristics and stability in two phase flow is seldom reported, and is of considerable practical relevance. (C) 2009
 
Publisher ELSEVIER SCIENCE INC
 
Date 2011-07-27T10:52:15Z
2011-12-26T12:56:51Z
2011-12-27T05:46:14Z
2011-07-27T10:52:15Z
2011-12-26T12:56:51Z
2011-12-27T05:46:14Z
2009
 
Type Article
 
Identifier EXPERIMENTAL THERMAL AND FLUID SCIENCE, 33(6), 963-975
0894-1777
http://dx.doi.org/10.1016/j.expthermflusci.2009.04.004
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7204
http://hdl.handle.net/10054/7204
 
Language en