Ultrasound-enhanced mass transfer during single-bubble diffusive growth

Alvaro Moreno Soto*, Pablo Penas, Guillaume Lajoinie, Detlef Lohse, Devaraj van der Meer

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Ultrasound is known to enhance surface bubble growth and removal in catalytic and microfluidic applications, yet the contributions of rectified diffusion and microstreaming phenomena toward mass transfer remain unclear. We quantify the effect of ultrasound on the diffusive growth of a single spherical CO2 bubble growing on a substrate in supersaturated water. The time-dependent bubble size, shape, oscillation amplitude, and microstreaming flow field are resolved. We show and explain how ultrasound can enhance the diffusive growth of surface bubbles by up to two orders of magnitude during volumetric resonance. The proximity of the wall forces the bubble to oscillate nonspherically, thereby generating vigorous streaming during resonance that results in convection-dominated growth.
Original languageEnglish
Article number063605
JournalPhysical review fluids
Volume5
Issue number6
DOIs
Publication statusPublished - 11 Jun 2020

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