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油中疏水性纤维上液滴聚结的动力学:形态与液桥演变

Dynamics of Droplet Coalescence on Hydrophobic Fibers in Oil: Morphology and Liquid Bridge Evolution.

作者信息

Li Bingbing, Tan Wei, Liu Guiyu, Huang Mo

机构信息

School of Energy and Chemical Engineering, Tianjin Renai College, Boxueyuan, Tuanbo New Town, Jinghai District, Tianjin 301636, P. R. China.

School of Chemical Engineering and Technology, Tianjin University, No. 135 Yaguan Road, Haihe Education Park, Tianjin 300354, P. R. China.

出版信息

ACS Omega. 2023 May 11;8(20):18019-18028. doi: 10.1021/acsomega.3c01209. eCollection 2023 May 23.

Abstract

Although droplet self-jumping on hydrophobic fibers is a well-known phenomenon, the influence of viscous bulk fluids on this process is still not fully understood. In this work, two water droplets' coalescence on a single stainless-steel fiber in oil was investigated experimentally. Results showed that lowering the bulk fluid viscosity and increasing the oil-water interfacial tension promoted droplet deformation, reducing the coalescence time of each stage. While the total coalescence time was more influenced by the viscosity and under-oil contact angle than the bulk fluid density. For water droplets coalescing on hydrophobic fibers in oils, the expansion of the liquid bridge can be affected by the bulk fluid, but the expansion dynamics exhibited similar behavior. The drops begin their coalescence in an inertially limited viscous regime and transition to an inertia regime. Larger droplets did accelerate the expansion of the liquid bridge but had no obvious influence on the number of coalescence stages and coalescence time. This study can provide a more profound understanding of the mechanisms underlying the behavior of water droplet coalescence on hydrophobic surfaces in oil.

摘要

尽管液滴在疏水纤维上的自跳跃是一个广为人知的现象,但粘性本体流体对这一过程的影响仍未得到充分理解。在这项工作中,对油中单个不锈钢纤维上的两个水滴聚并进行了实验研究。结果表明,降低本体流体粘度和增加油水界面张力会促进液滴变形,减少每个阶段的聚并时间。而总聚并时间受粘度和油下接触角的影响比本体流体密度更大。对于油中疏水纤维上的水滴聚并,液桥的扩展会受到本体流体的影响,但扩展动力学表现出相似的行为。液滴在惯性受限的粘性 regime 中开始聚并,并过渡到惯性 regime。较大的液滴确实加速了液桥的扩展,但对聚并阶段的数量和聚并时间没有明显影响。这项研究可以更深入地理解油中疏水表面上水滴聚并行为的潜在机制。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c07/10210508/92ae9d1363ec/ao3c01209_0002.jpg

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