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Главная Архив Thermal Letter Оргкомитет Будущие конференции AIHTC
International Heat Transfer Conference 8

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

FILM CONDENSATION OF STEAM ON HORIZONTAL FINNED TUBES: EFFECT OF FIN SHAPE

Paul J. Marto
Department of Mechanical Engineering, Naval Postgraduate School, Monterey, CA 93943-5100

E. Mltrou
Department of Mechanical Engineering Naval Postgraduate School Monterey, California 939A3, U.S.A.

A. S. Wanniarachchi
Department of Mechanical Engineering, Naval Postgraduate School Monterey, CA 93943, USA

John W. Rose
School of Engineering and Materials Science, Queen Mary, University of London, London E1 4NS, UK

DOI: 10.1615/IHTC8.160
pages 1695-1700

Аннотация

Heat-transfer measurements were made for filmwise condensation of steam on horizontal finned tubes under vacuum and at near-atmospheric pressure. Data were obtained for copper tubes with fins of rectangular, triangular, trapezoidal and near-parabolic cross sections and for a smooth tube having an outer diameter equal to the root diameter of the finned tubes.
Maximum steam-side enhancements of about A under vacuum and about 6 at atmospheric pressure were obtained compared to the smooth tube at the same heat flux. For the same fin height and spacing, fin shape altered the measured steam-side heat-transfer coefficient by approximately 10 to 15 percent, and a fin shape that provides for a gradually decreasing curvature from fin tip to fin root is believed to be best.

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