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TECHNICAL PAPERS: Evaporation, Boiling, and Condensation

Heat Transfer Mechanisms During Flow Boiling in Microchannels

[+] Author and Article Information
Satish G. Kandlikar

Thermal Analysis and Microfluidics Laboratory, Department of Mechanical Engineering, Rochester Institute of Technology, Rochester, NY 14623

J. Heat Transfer 126(1), 8-16 (Mar 10, 2004) (9 pages) doi:10.1115/1.1643090 History: Received February 20, 2003; Revised September 24, 2003; Online March 10, 2004
Copyright © 2004 by ASME
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References

Figures

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Forces acting on a vapor bubble growing on a heater surface in a liquid pool, only half of a symmetric bubble shown
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Forces acting on a liquid-vapor interface that covers the entire channel cross section
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Rapid bubble growth causing reversed flow in a parallel microchannel. Water flow is from left to right, single channel shown, t=(a) 0 ms, (b) 8 ms, (c) 16 ms, (d) 24 ms, (e) 32 ms, (f) 40 ms, (g) 48 ms, and (h) 56 ms, Steinke and Kandlikar 9.
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Variation of K2,CHF with diameter for flow boiling CHF data of Vandervort et al. 12 for different values of G in kg/m2 s
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Variation of K2,CHFK1,CHF0.75 with diameter for flow boiling CHF data of Vandervort et al. 12 for different values of G in kg/m2 s
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Ranges of the new non-dimensional parameter K1 employed in various experimental investigations
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Ranges of the new non-dimensional parameter K2 employed in various experimental investigations
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Ranges of Weber Number, We, employed in various experimental investigations
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Ranges of Capillary Number, Ca, employed in various experimental investigations
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Ranges of Reynolds Number, Re, employed in various experimental investigations
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Wall superheat required to initiate nucleation in a channel with hydraulic diameter Dh for saturated liquid conditions
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High speed flow visualization of water boiling in a 197 μm×1054 μm channel showing rapid dryout and wetting phenomena with periodic passage of liquid and vapor slugs, each successive frame is 5ms apart, Kandlikar and Balasubramanian 25
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Changes in contact angle at the liquid front during flow reversal sequence, water flowing in a parallel microchannel with Dh=200 μm, Steinke and Kandlikar 9
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Comparison of the Kandlikar 1235 correlation and Eqs. (15) and (16) for the Nucleate Boiling Dominant Region with Yen et al. 14 data in the laminar region, plotted with heat transfer coefficient as a function of local vapor quality x, R-134a, Dh=190 μm,ReLO=73,G=171 kg/m2 s,q=6.91 kW/m2
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Comparison of the Kandlikar 1235 correlation and Eqs. (15) and (16) for the Nucleate Boiling Dominant Region with Steinke and Kandlikar 36 data in the laminar region, plotted with heat transfer coefficient as a function of local vapor quality x, water, Dh=207 μm,ReLO=291,G=157 kg/m2 s,q=473 kW/m2

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