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TECHNICAL PAPERS: Evaporation, Boiling, and Condensation

Heat Transfer Model for Evaporation of Elongated Bubble Flows in Microchannels

[+] Author and Article Information
Anthony M. Jacobi

Department of Mechanical Engineering, University of Illinois, Urbana, IL, USA

John R. Thome

Laboratory of Heat and Mass Transfer (LTCM), Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland

J. Heat Transfer 124(6), 1131-1136 (Dec 03, 2002) (6 pages) doi:10.1115/1.1517274 History: Received July 31, 2001; Revised August 13, 2002; Online December 03, 2002
Copyright © 2002 by ASME
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References

Figures

Grahic Jump Location
Physical model of the elongated bubble flow regime expected in microchannel evaporating flows. A liquid-slug/vapor-bubble pair is identified for analysis, and the geometric description of the pair is provided.
Grahic Jump Location
Heat transfer behavior for R-11 at Psat=460 kPa,D=2 mm, and m=446 kg/m2 s, showing (a) h for varying ΔTeff(rcrit) at a fixed initial thin-film thickness of δo=12.5 μm, and (b) h for varying δo at a fixed ΔTeff=28 K(rcrit=0.070 μm).
Grahic Jump Location
Heat transfer behavior for R-11 at Psat=460 kPa,D=2 mm, and q=120 kW/m2, showing (a) h for varying ΔTeff(rcrit) at a fixed initial thin-film thickness of δo=12.5 μm, and (b) h for varying δo at a fixed ΔTeff=28 K(rcrit=0.700 μm).
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The predicted heat transfer coefficient for R-11 as a function of vapor quality, with ΔTeff=28 K(0.12<rcrit<0.06 μm), for Psat ranging from 294 to 450 kPa, with δo=12.5 μm,q=125 kW/m2, and m=560 kg/m2 s to cover the conditions reported by Bao et al. 12
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Comparison of the new model to the data of Bao et al. 12 for R-11 at Psat=460 kPa with the model parameters set to ΔTeff=28 K(rcrit=0.070 μm) and δo=12.5 μm

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