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Multiphase Science and Technology

Publicou 4 edições por ano

ISSN Imprimir: 0276-1459

ISSN On-line: 1943-6181

SJR: 0.144 SNIP: 0.256 CiteScore™:: 1.1 H-Index: 24

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EFFECTS OF SUBCOOLING ON SOUND GENERATION BY VAPOR BUBBLES IN WATER

Volume 27, Edição 1, 2015, pp. 67-75
DOI: 10.1615/MultScienTechn.v27.i1.40
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RESUMO

Sound generated by vapor bubbles condensing in subcooled water was measured to investigate effects of the degree, ΔT, of subcooling. Saturated steam from a boiler was injected into a horizontal water pipe flow through an orifice of 1 mm in diameter. The duct diameter was 16 mm and the Reynolds number of water was about 5 × 104. The subcooling was varied from 10 to 40 K. The sound level increased with increasing ΔT for ΔT ≤ 20 K, whereas it was independent of ΔT at higher ΔT. Video images of condensing bubbles revealed that the interfacial velocity of a condensing bubble had the same trend as that of the sound level, and therefore, the interfacial velocity in condensation is the key in the sound level. The rapid condensation at high ΔT induced emission of microbubbles and secondary pressure pulse generation. The latter also contributes to the increase in the sound level.

CITADO POR
  1. Kobayashi Hotaka, Hayashi Mirei, Kurose Kizuku, Ueno Ichiro, On homogeneity of vapor bubbles’ oscillation and corresponding heat transfer characteristics and boiling sound in microbubble emission boiling (MEB), International Journal of Heat and Mass Transfer, 188, 2022. Crossref

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