RT Journal Article
T1 Bubble-laden thermals in supersaturated water
A1 Peñas, Pablo
A1 Rodríguez Rodríguez, Francisco Javier
A1 Enríquez Paz Y Puente, Óscar Raúl
AB Bubble-laden thermals provide a formidable gas transport mechanism responsible, forinstance, for the explosive foaming-up process during the beer tapping prank, or theinfamous gas eruption of Lake Nyos in 1986. In this work we investigate experimentallythe growth and motion of laser-induced turbulent thermals in a carbonated water solutionwith surfactants. One of the novelties of this study is that we are able to quantify with hightemporal resolution the rate at which the gas volume contained in the bubbles grows. Afteran initial transient stage, the gas bubble and entrained liquid volumes of the thermal bothgrow as a cubic power of time. The buoyancy generation rate is well explained by the masstransfer scaling expected for individual bubbles. In contrast, the thermal rise velocity doesnot adhere to any particular scaling law. These facts lie in qualitative agreement with aphenomenological model, based on classical models for turbulent thermals, that takes intoaccount buoyancy generation.
PB Cambridge University Press
SN 0022-1120
YR 2021
FD 2021-01-10
LK https://hdl.handle.net/10016/34147
UL https://hdl.handle.net/10016/34147
LA eng
NO We acknowledge the support of the Spanish Ministry of Economy and Competitiveness throughgrants DPI2017-88201-C3-3-R and DPI2018-102829-REDT, partly funded through European Funds. This workwas supported by the Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), an NWOGravitation programme funded by the Ministry of Education, Culture and Science of the government of theNetherlands.
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