期刊
CHEMICAL ENGINEERING SCIENCE
卷 78, 期 -, 页码 9-13出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2012.04.030
关键词
Drop coalescence; Fluid mechanics; Interface; Simulation; Surfactant; Transport processes
资金
- Agriculture and Food Research Initiative from the USDA National Institute of Food and Agriculture [2008-55112-18797]
- Multi-University Research Initiative (MURI) from the Army Research Office [W911NF-08-1-0171]
Drop coalescence is a familiar event in both nature and technology, from spray and atomization systems to the production of food emulsions. It is well known that surfactants - which are ubiquitous contaminants and routinely used as industrial additives - play an important role in preventing drop coalescence. Little is known, however, about the mechanisms of coalescence after surfactant-laden drops make contact. Here we analyze these mechanisms using direct numerical simulation. Results show that due to the uneven contraction of the interface the surfactant accumulates on the liquid meniscus bridge joining the drops. Simulations further reveal that the accumulation is hampered by Marangoni stresses induced, in turn, by the uneven surfactant distribution. These entwined mechanisms control the rate at which the drops coalesce by modulating the pull of surface tension on the meniscus bridge. (C) 2012 Elsevier Ltd. All rights reserved.
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