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Some observations on the effect of interfacial vibration on saturated boiling heat transfer
Author(s) -
Nangia K. K.,
Chon W. Y.
Publication year - 1967
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690130512
Subject(s) - boiling , amplitude , heat flux , bubble , heat transfer , vibration , nucleate boiling , materials science , mechanics , thermodynamics , atmospheric pressure , chemistry , composite material , analytical chemistry (journal) , atomic physics , optics , meteorology , physics , acoustics , chromatography
An experimental investigation was carried out to determine the effects of vibration of the heat transfer surface in saturated pool boiling of water at atmospheric pressure. Wires of 0.01 in. diameter were heated electrically and vibrated electromagnetically at frequencies ranging from 20 to 115 cycles/sec. and amplitudes from 0.0118 to 0.0701 in. An increase in heat transfer up to a maximum of 200% at low Δ T was observed for an increase in frequency and/or amplitude. At a heat flux of 10 5 B.t.u./(hr.) (sq. ft.) high‐speed motion pictures were taken at 4,800 frames/sec. of a wire vibrating at 45 cycles/sec. with an amplitude of 0.0492 in. Comparison of these films with those taken at the same heat flux without vibration showed that the generating period and diameters at break‐off for the pulsed wire follow normal distribution. The waiting period is much longer and more fluctuating in nature. A slight increase in bubble emission frequency was also observed for pulsating wire.