Gai Shaolei, Peng Zhengbiao, Moghtaderi Behdad, Yu Jianglong, Doroodchi Elham
Discipline of Chemical Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia.
Discipline of Chemical Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia.
Ultrason Sonochem. 2021 Jan;70:105301. doi: 10.1016/j.ultsonch.2020.105301. Epub 2020 Aug 3.
Water with small volume (a few microlitres or less) often maintains its liquid state even at temperatures much lower than 0 °C. In this study, we examine the onset of ice nucleation in micro-sized water droplets with immersed solid particles under weak ultrasonic vibrations. The experimental results show that ice nucleation inside the water droplets can be successfully induced at relatively high temperatures. The experimental observations indicate that the nucleation sites are commonly encountered in the region between the particle and the substrate. A numerical study is conducted to gain insight into the possible underlying phenomenon for ice nucleation in such systems. The simulation results show that the collapse of cavitation bubbles in the crevice at the particle surface is structure sensitive with the hemisphere-shape crevice generating pressures as high as 1.63 GPa, which is theoretically suitable for inducing ice nucleation.
小体积（几微升或更少）的水即使在远低于0°C的温度下通常也能保持液态。在本研究中，我们研究了在弱超声振动下，含有浸入固体颗粒的微尺寸水滴中冰核形成的起始情况。实验结果表明，在相对较高的温度下可以成功诱导水滴内部形成冰核。实验观察表明，成核位点通常出现在颗粒与基底之间的区域。进行了数值研究，以深入了解此类系统中冰核形成可能的潜在现象。模拟结果表明，颗粒表面缝隙处空化气泡的坍塌对结构敏感，半球形缝隙产生的压力高达1.63 GPa，从理论上讲适合诱导冰核形成。
