Publication: Bubble-laden thermals in supersaturated water
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2021-01-10
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Cambridge University Press
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Abstract
Bubble-laden thermals provide a formidable gas transport mechanism responsible, for
instance, for the explosive foaming-up process during the beer tapping prank, or the
infamous gas eruption of Lake Nyos in 1986. In this work we investigate experimentally
the growth and motion of laser-induced turbulent thermals in a carbonated water solution
with surfactants. One of the novelties of this study is that we are able to quantify with high
temporal resolution the rate at which the gas volume contained in the bubbles grows. After
an initial transient stage, the gas bubble and entrained liquid volumes of the thermal both
grow as a cubic power of time. The buoyancy generation rate is well explained by the mass
transfer scaling expected for individual bubbles. In contrast, the thermal rise velocity does
not adhere to any particular scaling law. These facts lie in qualitative agreement with a
phenomenological model, based on classical models for turbulent thermals, that takes into
account buoyancy generation.
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Keywords
Plumes/thermals, Bubble dynamics, Coupled diffusion and flow
Bibliographic citation
Peñas, P., Enríquez, O. R., Rodríguez-Rodríguez, J. (2021). Bubble-laden thermals in supersaturated water. Journal of Fluid Mechanics, 924,pp. 1-16