溶解气体浓度对超声法产生大量纳米气泡的影响。
Effect of dissolved-gas concentration on bulk nanobubbles generation using ultrasonication.
作者信息
Lee Jeong Il, Yim Byung-Seung, Kim Jong-Min
机构信息
School of Mechanical Engineering, Chung-Ang University, Seoul, 156-756, Korea.
School of Mechanical System Engineering, Kangwon National University, Gangwon-do, 25913, Korea.
出版信息
Sci Rep. 2020 Nov 2;10(1):18816. doi: 10.1038/s41598-020-75818-8.
In this study, the effects of dissolved-gas concentration in liquid water on the nucleation and growth of bubbles and nanobubble (NB) generation were investigated by measuring the concentration and size distribution of NBs. Three types of liquids with different dissolved-gas concentrations-undersaturated, saturated, and supersaturated deionized (DI) water-were prepared, and NBs were generated via ultrasonic irradiation. As the dissolved-gas concentration increased, a large number of bubbles with relatively large diameters (several tens of micrometers or more) were generated, but the NB concentration decreased. The surface tension decreased with an increase in the dissolved gas concentration, and thus, the tensile strength which required for bubble growth became lower. Therefore, there were barely any NBs in supersaturated conditions because of the accelerated nucleation and bubble growth.
在本研究中，通过测量纳米气泡（NB）的浓度和尺寸分布，研究了液态水中溶解气体浓度对气泡的成核、生长以及纳米气泡产生的影响。制备了三种具有不同溶解气体浓度的液体——欠饱和、饱和和过饱和去离子水（DI水），并通过超声辐照产生纳米气泡。随着溶解气体浓度的增加，会产生大量直径相对较大（几十微米或更大）的气泡，但纳米气泡浓度降低。表面张力随着溶解气体浓度的增加而降低，因此，气泡生长所需的拉伸强度变得更低。所以，在过饱和条件下几乎没有纳米气泡，因为成核和气泡生长加速。
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