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Journal of Enhanced Heat Transfer
Factor de Impacto: 0.562 Factor de Impacto de 5 años: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimir: 1065-5131
ISSN En Línea: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v7.i5.50
pages 347-360

Compound Augmentation of Pool Boiling on Three Selected Commercial Tubes

J. Darabi
Center for Environmental Energy Engineering, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742-3035, USA
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

SINOPSIS

This paper will present results of an experimental study in which the Electrohydrodynamic (EHD) technique was utilized to provide compound enhancement of pool boiling heat transfer on three commercially available tubes. The tubes tested were: a low-fin 19 fins per inch, a modified high-fin 52 fins per inch, and a mechanically formed re-entrant cavity type. All tubes tested had a length of 63.5 mm (2.5″) and an outer diameter of 19 mm (3/4″). Five different electrode designs were tested, each over a predetermined heat flux and saturation temperature. The enhanced boiling mechanism in each case and a comparison of results for the three tubes are described. It was found that for the electrodes and heat fluxes tested, the specially designed (modified) high-fin tube yielded the highest enhancement amongst the three, with a nearly three-fold increase in the heat transfer coefficient. In the worst case, the EHD power consumption was less than 0.4% of the total heat transfer rate in the test section.


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