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Impact of aspect ratio on flow boiling of water in rectangular microchannels

DSpace at IIT Bombay

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Title Impact of aspect ratio on flow boiling of water in rectangular microchannels
 
Creator SINGH, SG
KULKARNI, A
DUTTAGUPTA, SP
PURANIK, BP
AGRAWAL, A
 
Subject convective heat-transfer
2-phase flow
silicon microchannels
friction factor
sinks
flux
two-phase flow
microchannel
pressure drop
annular flow model
experiments
aspect ratio
 
Description In this paper we focus on the impact of varying the aspect ratio of rectangular microchannels, on the overall pressure drop involving water boiling. An integrated system comprising micro-heaters, sensors and microchannels has been realized on (110) silicon wafers, following CMOS compatible process steps. Rectangular microchannels were fabricated with varying aspect ratios (width [W] to depth [H]) but constant hydraulic diameter of 142 +/- 2 gm and length of 20 mm. The invariant nature of the hydraulic diameter is confirmed through two independent means: physical measurements using profilometer and by measuring the pressure drop in single-phase fluid flow. The experimental results show that the pressure drop for two-phase flow in rectangular microchannels experiences minima at an aspect ratio of about 1.6. The minimum is possibly due to opposing trends of frictional and acceleration pressure drops, with respect to aspect ratio. In a certain heat flux and mass flux range, it is observed that the two-phase pressure drop is lower than the corresponding single-phase value. This is the first study to investigate the effect of aspect ratio in two-phase flow in microchannels, to the best of our knowledge. The results are in qualitative agreement with annular flow model predictions. These results improve the possibility of designing effective heat-sinks based on two-phase fluid flow in microchannels. (C) 2008
 
Publisher ELSEVIER SCIENCE INC
 
Date 2011-07-27T09:32:10Z
2011-12-26T12:56:36Z
2011-12-27T05:45:35Z
2011-07-27T09:32:10Z
2011-12-26T12:56:36Z
2011-12-27T05:45:35Z
2008
 
Type Article
 
Identifier EXPERIMENTAL THERMAL AND FLUID SCIENCE, 33(1), 153-160
0894-1777
http://dx.doi.org/10.1016/j.expthermflusci.2008.07.014
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7184
http://hdl.handle.net/10054/7184
 
Language en