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Journal of Enhanced Heat Transfer
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ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v3.i4.60
pages 301-309

Boiling Heat Transfer Enhancement of R-134a in a Tube Bundle Utilizing The EHD Technique

K. Cheung
Heat Transfer Enhancement Laboratory Center for Environmental Energy Engineering, Department of Mechanical Engineering University of Maryland College Park, Maryland 20742
Michael M. Ohadi
Small and Smart Thermal Systems Laboratory, Center for Energy Environmental Engineering, Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742, USA
Serguei V. Dessiatoun
Department of Mechanical Engineering, University of Maryland, College Park, Maryland, USA

RÉSUMÉ

Compound enhancement of boiling heat transfer with R-l34a in a tube bundle was studied experimentally utilizing the electrohydrodynamics (EHD) technique. A laboratory-scale tube bundle utilizing commercially available forty fins per inch (40 fpi) tubes with R-134a as working fluid was used in the experiments. Two electrode configurations were tested (straight wire and wire mesh type). The results of the experiments suggest the applicability of the EHD technique for heat transfer enhancement in tube bundle while quantifying the role of various operating parameters. More than a four fold increase in the overall bundle heat transfer coefficient was obtained with wire mesh electrode. The corresponding enhancement with the straight wire electrode was two fold. The maximum EHD power consumption for the two electrode configurations were 5% and 1.2% of the bundle heat transfer rate, respectively. The experiments also addressed the effect of electric field polarity, which was found to have no pronounced effect on the enhancement mechanism for the bundle configuration at hand.


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