Mechanisms of ultrasound foam interactions

Mechanisms of ultrasound foam interactions
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超声泡沫相互作用的机制

DOI:
10.1002/apj.225
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发表时间:
2009
影响因子:
1.8
通讯作者:
Winterburn J
Winterburn J
中科院分区:
工程技术4区
文献类型:
--
作者:
Winterburn J

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提出了两种频率的低功率超声波对洗涤剂 (Teepol) 稳定的空气-水泡沫影响的实验研究。泡沫在 28 和 40 kHz 下接受超声波处理,功率与泡沫体积比约为 3 W l−1,特别考虑空气和水之间的声阻抗不连续性。将泡沫高度、液体排出和塌陷行为与不使用超声波进行的实验进行比较。在 40 kHz 超声波的情况下,观察到液体排出率增加,并且观察到平均液体滞留量显着增加并随后达到峰值,该现象发生在 4 分钟时。这些结果似乎与泡沫的初始持液量无关。排液和平均持液率结果与均匀破裂(HR)和破裂前沿破裂(FR)的泡沫破裂机制有关,得出结论,在40 kHz超声波的影响下,破裂前沿破裂主导了泡沫的破裂。版权所有 © 2009 科廷科技大学和 John Wiley & Sons, Ltd.
An experimental investigation into the effects of two frequencies of low‐power ultrasound on detergent (Teepol) stabilised air‐water foams is presented. Foam was subjected to ultrasound at 28 and 40 kHz with a power‐to‐foam volume ratio of approximately 3 W l−1with particular consideration being given to the acoustic impedance discontinuity between air and water. The foam height, liquid drainage and collapse behaviour were compared to experiments conducted without ultrasound. In the case of 40 kHz ultrasound, an increased liquid drainage rate was observed and a pronounced increase and subsequent peak in mean liquid hold‐up, which occurred at 4 min, was observed. These results appear to be independent of the initial liquid hold‐up of the foam. Liquid drainage and mean liquid hold‐up results were related to foam collapse mechanisms of homogeneous rupture (HR) and rupture front breakage (FR), concluding that rupture front breakage dominates the collapse of foam under the influence of 40 kHz ultrasound. Copyright © 2009 Curtin University of Technology and John Wiley & Sons, Ltd.
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