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arXiv 2005.05998physics.flu-dyn
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超声强化单泡扩散生长过程中的传质

Ultrasound-enhanced mass transfer during single-bubble diffusive growth

Álvaro Moreno Soto, Pablo Peñas, Guillaume Lajoinie, Detlef Lohse, Devaraj van der Meer

摘要:

已知超声波在催化和微流体应用中增强表面气泡生长和去除,但整流扩散和微流现象对传质的贡献仍不清楚。我们量化的超声波对一个单一的球形CO $_2$气泡生长在过饱和水中的基板上的扩散生长的影响。求解了气泡尺寸、形状、振幅和微流场随时间的变化关系。我们展示并解释了如何超声可以提高表面气泡的扩散增长高达两个数量级的体积共振。壁的接近迫使气泡非球形地振荡,从而在共振期间产生剧烈的流动,导致对流主导的生长。

英文摘要:

Ultrasound is known to enhance surface bubble growth and removal in catalytic and microfluidic applications, yet the contributions of rectified diffusion and microstreaming phenomena towards mass transfer remain unclear. We quantify the effect of ultrasound on the diffusive growth of a single spherical CO$_2$ 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 non-spherically, thereby generating vigorous streaming during resonance that results in convection-dominated growth.

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