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arXiv 2311.02417cond-mat.softphysics.flu-dyn
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含表面活性剂液滴聚结的分子动力学模拟

Molecular dynamics simulation of the coalescence of surfactant-laden droplets

Soheil Arbabi, Piotr Deuar, Mateusz Denys, Rachid Bennacer, Zhizhao Che, Panagiotis E. Theodorakis

AI总结:

本研究采用统计缔合流体理论粗粒化模型,探究不同类型及浓度表面活性剂对水滴聚结的影响,揭示了表面活性剂输运机制、聚结动力学阶段及浓度效应,为相关聚结机制研究提供新见解。

摘要:

我们利用统计缔合流体理论得到的粗粒化模型,通过多种不同表面活性剂类型及宽范围浓度,研究了含表面活性剂的水滴聚结过程。研究结果详细揭示了在多种浓度和多种表面活性剂类型下,聚结过程中表面活性剂的通用质量输运机制。聚结起始由表面活性剂聚集引发的单一颈缩触发,其残余物会部分被正在形成的液桥包裹。我们全面证实了初始热区的存在,该阶段液桥宽度保持恒定,随后是惯性区,液桥宽度大致随时间的平方根增长,但未发现中间粘性区的证据。随着表面活性剂浓度升高,聚结速度变慢;且有证据表明,当浓度达到临界浓度数倍时,会出现另一种性质的进一步减速。我们预期这些结果将为含表面活性剂液滴的聚结机制提供更深入的见解。

英文摘要:

We investigate the coalescence of surfactant-laden water droplets by using several different surfactant types and a wide range of concentrations by means of a coarse-grained model obtained by the statistical associating fluid theory. Our results demonstrate in detail a universal mass transport mechanism of surfactant across many concentrations and several surfactant types during the process. Coalescence initiation is seen to occur via a single pinch due to aggregation of surface surfactant, and its remnants tend to become engulfed in part inside the forming bridge. Across the board we confirm the existence of an initial thermal regime with constant bridge width followed by a later inertial regime with bridge width scaling roughly as the square root of time, but see no evidence of an intermediate viscous regime. Coalescence becomes slower as surfactant concentration grows, and we see evidence of the appearance of a further slowdown of a different nature for several times the critical concentration. We anticipate that our results provide further insights in the mechanisms of coalescence of surfactant-laden droplets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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