Role of surfactant-induced Marangoni stresses in drop-interface coalescence
We study the effect of surfactants on the dynamics of a drop-interface coalescence using full three-dimensional direct numerical simulations. We employ a hybrid interface-tracking/level-set method, which takes into account Marangoni stresses that arise from surface-tension gradients, interfacial and...
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| Veröffentlicht in: | Journal of fluid mechanics 2021-10, Vol.925, Article 15 |
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| creator | Constante-Amores, C.R. Batchvarov, A. Kahouadji, L. Shin, S. Chergui, J. Juric, D. Matar, O.K. |
| description | We study the effect of surfactants on the dynamics of a drop-interface coalescence using full three-dimensional direct numerical simulations. We employ a hybrid interface-tracking/level-set method, which takes into account Marangoni stresses that arise from surface-tension gradients, interfacial and bulk diffusion and sorption kinetic effects. We validate our predictions against the experimental data of Blanchette and Bigioni (Nat. Phys., vol. 2, issue 4, 2006, pp. 254–257) and perform a parametric study that demonstrates the delicate interplay between the flow fields and those associated with the surfactant bulk and interfacial concentrations. The results of this work unravel the crucial role of the Marangoni stresses in the flow physics of coalescence, with particular attention paid to their influence on the neck reopening dynamics in terms of stagnation-point inhibition, and near-neck vorticity generation. We demonstrate that surfactant-laden cases feature a rigidifying effect on the interface compared with the surfactant-free case, a mechanism that underpins the observed surfactant-induced phenomena. |
| doi_str_mv | 10.1017/jfm.2021.682 |
| format | Article |
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We employ a hybrid interface-tracking/level-set method, which takes into account Marangoni stresses that arise from surface-tension gradients, interfacial and bulk diffusion and sorption kinetic effects. We validate our predictions against the experimental data of Blanchette and Bigioni (Nat. Phys., vol. 2, issue 4, 2006, pp. 254–257) and perform a parametric study that demonstrates the delicate interplay between the flow fields and those associated with the surfactant bulk and interfacial concentrations. The results of this work unravel the crucial role of the Marangoni stresses in the flow physics of coalescence, with particular attention paid to their influence on the neck reopening dynamics in terms of stagnation-point inhibition, and near-neck vorticity generation. We demonstrate that surfactant-laden cases feature a rigidifying effect on the interface compared with the surfactant-free case, a mechanism that underpins the observed surfactant-induced phenomena.</description><identifier>ISSN: 0022-1120</identifier><identifier>EISSN: 1469-7645</identifier><identifier>DOI: 10.1017/jfm.2021.682</identifier><language>eng</language><publisher>Cambridge, UK: Cambridge University Press</publisher><subject>Chemical engineering ; Chemical Sciences ; Coalescence ; Coalescing ; Diffusion effects ; Direct numerical simulation ; Dynamics ; Engineering Sciences ; JFM Papers ; Mechanics ; Nonlinear Sciences ; Numerical analysis ; Physical Sciences ; Physics ; Physics, Fluids & Plasmas ; Science & Technology ; Stresses ; Surfactants ; Technology ; Tracking ; Viscosity ; Vorticity</subject><ispartof>Journal of fluid mechanics, 2021-10, Vol.925, Article 15</ispartof><rights>The Author(s), 2021. 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Fluid Mech</addtitle><description>We study the effect of surfactants on the dynamics of a drop-interface coalescence using full three-dimensional direct numerical simulations. We employ a hybrid interface-tracking/level-set method, which takes into account Marangoni stresses that arise from surface-tension gradients, interfacial and bulk diffusion and sorption kinetic effects. We validate our predictions against the experimental data of Blanchette and Bigioni (Nat. Phys., vol. 2, issue 4, 2006, pp. 254–257) and perform a parametric study that demonstrates the delicate interplay between the flow fields and those associated with the surfactant bulk and interfacial concentrations. The results of this work unravel the crucial role of the Marangoni stresses in the flow physics of coalescence, with particular attention paid to their influence on the neck reopening dynamics in terms of stagnation-point inhibition, and near-neck vorticity generation. We demonstrate that surfactant-laden cases feature a rigidifying effect on the interface compared with the surfactant-free case, a mechanism that underpins the observed surfactant-induced phenomena.</description><subject>Chemical engineering</subject><subject>Chemical Sciences</subject><subject>Coalescence</subject><subject>Coalescing</subject><subject>Diffusion effects</subject><subject>Direct numerical simulation</subject><subject>Dynamics</subject><subject>Engineering Sciences</subject><subject>JFM Papers</subject><subject>Mechanics</subject><subject>Nonlinear Sciences</subject><subject>Numerical analysis</subject><subject>Physical Sciences</subject><subject>Physics</subject><subject>Physics, Fluids & Plasmas</subject><subject>Science & 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O.K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Role of surfactant-induced Marangoni stresses in drop-interface coalescence</atitle><jtitle>Journal of fluid mechanics</jtitle><stitle>J FLUID MECH</stitle><addtitle>J. Fluid Mech</addtitle><date>2021-10-25</date><risdate>2021</risdate><volume>925</volume><artnum>15</artnum><artnum>A15</artnum><issn>0022-1120</issn><eissn>1469-7645</eissn><abstract>We study the effect of surfactants on the dynamics of a drop-interface coalescence using full three-dimensional direct numerical simulations. We employ a hybrid interface-tracking/level-set method, which takes into account Marangoni stresses that arise from surface-tension gradients, interfacial and bulk diffusion and sorption kinetic effects. We validate our predictions against the experimental data of Blanchette and Bigioni (Nat. Phys., vol. 2, issue 4, 2006, pp. 254–257) and perform a parametric study that demonstrates the delicate interplay between the flow fields and those associated with the surfactant bulk and interfacial concentrations. The results of this work unravel the crucial role of the Marangoni stresses in the flow physics of coalescence, with particular attention paid to their influence on the neck reopening dynamics in terms of stagnation-point inhibition, and near-neck vorticity generation. We demonstrate that surfactant-laden cases feature a rigidifying effect on the interface compared with the surfactant-free case, a mechanism that underpins the observed surfactant-induced phenomena.</abstract><cop>Cambridge, UK</cop><pub>Cambridge University Press</pub><doi>10.1017/jfm.2021.682</doi><tpages>21</tpages><orcidid>https://orcid.org/0000-0002-9196-3966</orcidid><orcidid>https://orcid.org/0000-0003-3703-0601</orcidid><orcidid>https://orcid.org/0000-0002-7978-819X</orcidid><orcidid>https://orcid.org/0000-0002-1578-6435</orcidid><orcidid>https://orcid.org/0000-0002-0530-8317</orcidid><orcidid>https://orcid.org/0000-0001-8805-1192</orcidid><orcidid>https://orcid.org/0000-0003-2476-5633</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Chemical engineering Chemical Sciences Coalescence Coalescing Diffusion effects Direct numerical simulation Dynamics Engineering Sciences JFM Papers Mechanics Nonlinear Sciences Numerical analysis Physical Sciences Physics Physics, Fluids & Plasmas Science & Technology Stresses Surfactants Technology Tracking Viscosity Vorticity |
| title | Role of surfactant-induced Marangoni stresses in drop-interface coalescence |
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