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Journal of Enhanced Heat Transfer
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ISSN Imprimir: 1065-5131
ISSN En Línea: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2013003878
pages 165-177

HEAT TRANSFER DURING POOL BOILING OF WATER, METHANOL, AND R141B ON POROUS COATED HORIZONTAL TUBE BUNDLES

Janusz Cieslinski
Gdansk University of Technology
Krzysztof Krasowski
Energa Kogeneracja Sp. z.o.o., ul. Electric 20a, 82-300 Elblag, Polska 82-300 Elblag, Poland

SINOPSIS

This paper presents the results of experimental investigation of water, methanol, and R141b refrigerant boiling on horizontal porous coated tube bundles supposed to represent a flooded-type evaporator. Experiments were carried out for a bundle of 19 tubes in triangular layout for two pitch-to-diameter ratio values−1.7 and 2.0−in atmospheric and subatmospheric pressure conditions. Average heat transfer coefficients−both local, row-specific, and for the whole bundle−were determined. The boiling process on a bundle was visualized with a charge-coupled device camera and laser sheet technique. A Nusselt-type correlation equation allowing the calculation of the average heat transfer coefficient for boiling on porous coated tube bundles has been proposed.


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