کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
598371 1454088 2006 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Surfactant effects on buoyancy-driven viscous interactions of deformable drops
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Surfactant effects on buoyancy-driven viscous interactions of deformable drops
چکیده انگلیسی

Buoyancy-driven interactions of two deformable drops with a bulk-insoluble, nonionic surfactant are studied with a curvatureless boundary-integral algorithm. At moderate drop-to-medium viscosity ratios with a linear equation of state, the surfactant causes breakup of the larger drop to become dominant over breakup of the smaller drop at O(0.1)O(0.1) values of the dimensionless gas constant ββ for a surface Péclet number PesPes of 100. For Pes≤10Pes≤10, the surfactant has little effect on breakup for β≤0.2β≤0.2. For Pes=1000Pes=1000, critical horizontal offsets for breakup of the larger drop exceed those for breakup of the smaller drop at β=O(0.01)β=O(0.01). The influence of surfactant on the deformation and breakup of the smaller drop increases when it becomes closer in size to that of the larger drop. Surfactant effects are less significant when the drop-to-medium viscosity ratio is greater than unity. For the case of bubbles, at Pes=100Pes=100, the surfactant is swept to the trailing edges early in the trajectories and leads to cusp formation at β=O(0.01)β=O(0.01).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volumes 282–283, 20 July 2006, Pages 50–60
نویسندگان
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