微重力下的水泡沫,测量气泡大小

IF 1.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Marina Pasquet, Nicolo Galvani, Olivier Pitois, Sylvie Cohen-Addad, Reinhard Höhler, Anthony T Chieco, Sam Dillavou, Jesse M Hanlan, Douglas J Durian, Emmanuelle Rio, Anniina Salonen, Dominique Langevin
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引用次数: 2

摘要

本文研究了微重力条件下湿泡沫体的气泡尺寸分布随气体扩散交换的变化规律。我们重点比较了泡沫表面图像确定的气泡大小与漫射透射光谱(DTS)确定的散装泡沫中的气泡大小。从泡沫表面的图像中提取气泡大小分布是困难的,因此我们使用了三种不同的程序:手动分析,使用自定义Python脚本的自动分析和机器学习分析。一旦识别并考虑了各种缺陷,所有三个过程都会在误差条内产生相同的结果。DTS只允许确定与光子输运平均自由程成正比的平均气泡半径。先前导出的无限横向延伸板状样品的漫射透射光强与l *之间的关系不适用于微重力实验中使用的长方体细胞。导出了在特定光学边界条件下传输的散射强度的一个新的更一般的表达式,并应用于确定平均气泡半径。在整个粗化过程中,从DTS推导出的平均气泡半径和在样品表面测量到的相同平均气泡半径的时间演变是相同的(可能接近于1)。最后,进行了地面实验,比较了散装湿泡沫中的气泡大小分布及其表面的气泡大小分布,这些气泡分布时间很短,以至于扩散气体交换微不足道。他们被发现是相似的,证实了在表面看到的气泡是大泡沫气泡的代表。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Aqueous foams in microgravity, measuring bubble sizes
The paper describes a study of wet foams in microgravity whose bubble size distribution evolves due to diffusive gas exchange. We focus on the comparison between the size of bubbles determined from images of the foam surface and the size of bubbles in the bulk foam, determined from Diffuse Transmission Spectroscopy (DTS). Extracting the bubble size distribution from images of a foam surface is difficult so we have used three different procedures: manual analysis, automatic analysis with a customized Python script and machine learning analysis. Once various pitfalls were identified and taken into account, all the three procedures yield identical results within error bars. DTS only allows the determination of an average bubble radius which is proportional to the photon transport mean free path ℓ * . The relation between the measured diffuse transmitted light intensity and ℓ * previously derived for slab-shaped samples of infinite lateral extent does not apply to the cuboid geometry of the cells used in the microgravity experiment. A new more general expression of the diffuse intensity transmitted with specific optical boundary conditions has been derived and applied to determine the average bubble radius. The temporal evolution of the average bubble radii deduced from DTS and of the same average radii of the bubbles measured at the sample surface is the same (to a factor probably close to one) throughout the coarsening. Finally, ground experiments were performed to compare bubble size distributions in a bulk wet foam and at its surface at times so short that diffusive gas exchange is insignificant. They were found to be similar, confirming that bubbles seen at the surface are representative of the bulk foam bubbles.
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来源期刊
Comptes Rendus. Chimie
Comptes Rendus. Chimie 化学-化学综合
CiteScore
2.10
自引率
25.00%
发文量
89
审稿时长
3 months
期刊介绍: The Comptes Rendus - Chimie are a free-of-charge, open access and peer-reviewed electronic scientific journal publishing original research articles. It is one of seven journals published by the Académie des sciences. Its objective is to enable researchers to quickly share their work with the international scientific community. The Comptes Rendus - Chimie also publish journal articles, thematic issues and articles reflecting the history of the Académie des sciences and its current scientific activity.
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