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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

EFFECT OF SYSTEMATIC GROOVED SURFACE ON THE RATE OF HEAT AND MASS TRANSFER IN A FALLING LIQUID FILM

Get access (open in a dialog) DOI: 10.1615/IHTC8.1710
pages 1957-1962

要約

Heat and mass transfer between the wall of a systematic grooved surface pipe and a falling liquid film are studied experimentally. Applying a method of chemical dissolution the mass transfer coefficient /3 is measured. It is higher than that for a smooth surface pipe about 3−4 times.
Heat transfer coefficients are also measured. They are also higher than that for the smooth surface pipe about 2−3 times, and a correlation of similarity numbers is obtained.
By adding trace of surface active agent to distilled water to measure the heat transfer coefficient, a novel phenomenon of "wake Interference" is founds The heat transfer coefficient h is higher than in the case of pure water, and a lateral wave along the groove is observed. A mechanism of wake interference induced by interfacial turbulence is suggested.