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TECHNICAL PAPERS: Heat Transfer Enhancement

Influence of Flow Regime, Heat Flux, and Mass Flux on Electrohydrodynamically Enhanced Convective Boiling

[+] Author and Article Information
J. E. Bryan

Outokumpu Copper, Franklin, KY 42134

J. Seyed-Yagoobi

Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123

J. Heat Transfer 123(2), 355-367 (May 15, 2000) (13 pages) doi:10.1115/1.1316782 History: Received March 14, 1999; Revised May 15, 2000
Copyright © 2001 by ASME
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References

Figures

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Simple representations of electric body force density components with ε1 and ε2 representing the liquid vapor permittivity, respectively. (a) Coulomb force, (b) dielectrophoresis (type of polarization force), (c) and (d) are additional variations of the polarization force.
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Schematic of experimental apparatus
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Drawing of test section
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Comparison of experimental data to correlations by Kandlikar 13 and Wattelet 14 for three operating conditions
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Results with R-134a in a smooth tube for the 10-cm section at Tsat=4.9°C and G=99.9 kg/m2s: (a) the flow map, (b) average heat transfer coefficient data, and (c) local heat transfer coefficient data
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Results with R-134a in a smooth tube for second location (20 cm from inlet to test section) on the 30-cm section at Tsat=4.9°C and G=99.9 kg/m2s: (a) the flow map, (b) average heat transfer coefficient data, and (c) local heat transfer coefficient data
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Results for R-134a in a smooth tube for second location (37.5 cm from inlet to test section) on the 50-cm section at Tsat=4.9°C and G=99.9 kg/m2s: (a) the flow map, (b) average heat transfer coefficient data, and (c) local heat transfer coefficient data
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Mass flux comparison in intermittent flow regime for R-134a in a smooth tube at a Tsat of 25°C: (a) the flow map, (b) average heat transfer coefficient data, and (c) local heat transfer coefficient data
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Mass flux comparison from intermittent to annular flow regimes for R-134a in a smooth tube at a Tsat of 25°C: (a) the flow map, (b) average heat transfer coefficient data, and (c) local heat transfer coefficient data
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Influence of heat flux on EHD enhanced heat transfer for R-134a in a smooth tube at G=300.4 kg/m2s and Tsat=25.0°C: (a) second location (20 cm from inlet to test section) on the 30-cm section, (b) second location (37.5 cm from inlet to test section) on the 50-cm section
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Influence of heat flux on EHD enhanced heat transfer for R-134a in a smooth tube at G=101.3 kg/m2s and Tsat=25.1°C: (a) second location (20 cm from inlet to test section) on the 30-cm section, (b) second location (37.5 cm from inlet to test section) on the 50-cm section

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