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 ${\mathrm{CO}}_2$ 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 nonspherically, thereby generating vigorous streaming during resonance that results in convection-dominated growth.

中文翻译：

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单泡扩散生长过程中的超声增强传质

众所周知，在催化和微流体应用中，超声波会增强表面气泡的生长和去除，但整流扩散和微流现象对传质的贡献尚不清楚。我们量化超声对单个球体扩散生长的影响${\mathrm{一氧化碳}}_2$在过饱和水中的基质上生长的气泡。解析了随时间变化的气泡大小，形状，振荡幅度和微流流场。我们展示并解释了超声如何在体积共振过程中将表面气泡的扩散性增长提高两个数量级。壁的接近迫使气泡非球面振荡，从而在共振过程中产生剧烈流动，从而导致对流为主的生长。