Controlling droplet bouncing and coalescence with surfactant

NCUIR > Engineering College > Department of Civil Engineering > journal & Dissertation > Item 987654321/100521

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Title:	Controlling droplet bouncing and coalescence with surfactant
Authors:	黃冠嶺;Pan, K.-L.;Tseng, Y.-H.;Chen, J.-C.;Huang, K.-L.;Wang, C.-H.;Lai, M.-C.
Contributors:	工學院土木工程學系
Keywords:	Applied mathematics;Atmospheric conditions;Coalescence;Convection;Droplets;Dye dispersion;Dynamics;Emulsions;Gas-liquid systems;Gases;Interfaces;Marangoni convection;Mathematical models;Moisture content;Preservation;Surface tension;Surfactants;Water content
Date:	2016-07-25
Issue Date:	2026-04-21 14:05:12 (UTC+8)
Publisher:	Cambridge University Press;Cambridge, UK: Cambridge University Press
Abstract:	摘要： The collision between aqueous drops in air typically leads to coalescence after impact. Rebounding of the droplets with similar sizes at atmospheric conditions is not generated, unless with significantly large pressure or high impact parameters exhibiting near-grazing collision. Here we demonstrate experimentally the creation of a non-coalescent regime through addition of a small amount of water-soluble surfactant. We perform a direct simulation to account for the continuum and short-range flow dynamics of the approaching interfaces, as affected by the soluble surfactant. Based on the immersed-boundary formulation, a conservative scheme is developed for solving the coupled surface-bulk convection–diffusion concentration equations, which presents excellent mass preservation in the solvent as well as conservation of total surfactant mass. We show that the Marangoni effect, caused by non-uniform distributions of surfactant on the droplet surface and surface tension, induces stresses that oppose the draining of gas in the interstitial gap, and hence prohibits merging of the interfaces. In such gas–liquid systems, the repulsion caused by the addition of surfactant, as frequently observed in liquid–liquid systems such as emulsions in the form of an electric double-layer force, was found to be too weak to dominate in the attainable range of interfacial separation distances. These results thus identify the key mechanisms governing the impact dynamics of surfactant-coated droplets in air and imply the potential of using a small amount of surfactant to manipulate impact outcomes, for example, to prevent coalescence between droplets or interfaces in gases. 其他題名： J. Fluid Mech 出版者： Cambridge, UK: Cambridge University Press 出版日期： 2016-07-25 出處： Journal of fluid mechanics, 2016-07, Vol.799, p.603-636 資源來源： Alma/SFX Local Collection 版權： 2016 Cambridge University Press 識別號： ISSN: 0022-1120 識別號： EISSN: 1469-7645 識別號： DOI: 10.1017/jfm.2016.381
Appears in Collections:	[Department of Civil Engineering] journal & Dissertation

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