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Bubble growth and transient heat transfer at the onset of boiling

✍ Scribed by Sako, Mitsuo ;Kikuchi, Yoshihiro ;Hino, Keita ;Makara, Hironobu

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
126 KB
Volume
26
Category
Article
ISSN
0096-0802

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✦ Synopsis

An experimental study was conducted to investigate transient local heat transfer around a bubble at onset of boiling on a thin glass heating plate immersed in saturated n-hexane at low pressure. Eight rapid response Cu-Ni thermocouples consisting of a vacuum deposited thin film were used to measure the temperature change of the heating surface. Simultaneous high-speed video photographs were also obtained. The surface temperatures near a nucleation site decreased rapidly owing to the evaporation of a thin layer (microlayer) of liquid formed beneath the bubble in the early period and the rate of bubble growth increased with increasing incipient boiling superheat (βˆ†T IB ). The thickness of the microlayer decreased markedly with increasing βˆ†T IB .

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