锥形管道中纳米气泡生长动力学
Dynamics of nanoscale bubbles growing in a tapered conduit
摘要：
我们预测的动力学和形状的纳米气泡生长在一个过饱和的解决方案，限制在一个锥形，Hele-Shaw设备与一个小的开角$Φ\ll 1$。我们的研究灵感来自于对纳米级气泡的生长和平移的实验观察，直径从几十到几百纳米不等，用液体细胞透射电子显微镜进行。在我们的实验中，电子束起着双重作用：它过饱和的气体辐解产物的解决方案，这导致气泡成核和生长，它提供了一种手段，以纳米级分辨率的气泡原位成像。为了理解我们的实验数据，我们提出了一个迁移机制，基于Blake-Haynes理论，这是适用于零毛细管和邦德数和高限制的渐近极限。与实验数据相一致，我们的模型预测，在限制的存在下，生长速率是数量级慢于在散装中生长的气泡，并且锥形通道和接触线钉扎的组合创建泪滴形气泡。
英文摘要：
We predict the dynamics and shapes of nanobubbles growing in a supersaturated solution confined within a tapered, Hele-Shaw device with a small opening angle $Φ\ll 1$. Our study is inspired by experimental observations of the growth and translation of nanoscale bubbles, ranging in diameter from tens to hundreds of nanometers, carried out with liquid-cell transmission electron microscopy. In our experiments, the electron beam plays a dual role: it supersaturates the solution with gaseous radiolysis products, which lead to bubble nucleation and growth, and it provides a means to image the bubbles in-situ with nanoscale resolution. To understand our experimental data, we propose a migration mechanism, based on Blake-Haynes theory, which is applicable in the asymptotic limits of zero capillary and Bond numbers and high confinement. Consistent with experimental data, our model predicts that in the presence of confinement, growth rates are orders of magnitude slower compared to a bubble growing in the bulk and that the combination of a tapered channel and contact line pinning create tear-drop shaped bubbles.
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