Experimental study on the characteristics of bubble dynamics in pool boiling of water influenced by surface acoustic wave (SAW)

•First effort to experimentally investigate the boiling bubble behaviors by SAW.•Unique phenomena of bubble penetration and bubble successivity are reported.•Mechanism of bubble penetration and bubble successivity by SAW are discussed.•Bubble frequency is increased and the boiling heat transfer is e...

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Bibliographic Details
Published inInternational journal of heat and mass transfer Vol. 229; p. 125725
Main Authors Hao, Xue-Ying, Guo, Dong-Sheng, Li, Xiao-Bin, Zhang, Hong-Na, Li, Feng-Chen
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.09.2024
Subjects
Bubble behavior
Bubble penetration
Bubble successivity
Pool boiling
Surface acoustic wave
Bubble successivity
Surface acoustic wave
Bubble penetration
Pool boiling
Bubble behavior
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Summary:•First effort to experimentally investigate the boiling bubble behaviors by SAW.•Unique phenomena of bubble penetration and bubble successivity are reported.•Mechanism of bubble penetration and bubble successivity by SAW are discussed.•Bubble frequency is increased and the boiling heat transfer is enhanced by SAW. An experimental investigation on the boiling bubble dynamics of ultra-pure water was conducted by using surface acoustic wave (SAW). A peculiar bubble penetration phenomenon during water boiling was discovered in the absence of SAW excitation. SAW excitation was introduced by using a RF with amplitude ranging from 0 to 10Vpp, altered by a SAW filter. With SAW application in subcooled pool boiling (subcooling of 20 K), both bubble penetration and the bubble successivity behavior (bubbles appeared successively at the same nucleation site without waiting period) were observed, with an increase in the number of successive bubbles as SAW amplitude increased. The reason for this phenomenon is attributed to the disruption of the flow in the superheated fluid layer near the heating surface, and the promotion effect of the convection of the hot and cold fluids by SAW. This should be the main reason that SAW enhances boiling heat transfer. The finding is helpful to better understand the mechanism of boiling under acoustic waves and lay a foundation for its active boiling control.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2024.125725