کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
667282 1458520 2014 20 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Lattice Boltzmann simulations of drop deformation and breakup in shear flow
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Lattice Boltzmann simulations of drop deformation and breakup in shear flow
چکیده انگلیسی
The behavior of a single liquid drop suspended in another liquid and subjected to simple shear flow is studied numerically using a diffuse interface free energy lattice Boltzmann method. The system is fully defined by three physical, and two numerical dimensionless numbers: a Reynolds number Re, a capillary number Ca, the viscosity ratio λ, an interface-related Peclet number Pe, and the ratio of interface thickness and drop size (the Cahn number Ch). The influence of Pe,Ch and mesh resolution on accuracy and stability of the simulations is investigated. Drops of moderate resolution (radius less than 30 lattice units) require smaller interface thickness, while a thicker interface should be used for highly resolved drops. The Peclet number is controlled by the mobility coefficient Γ. Based on the results, the simulations are stable when Γ is in the range 1-15. In addition, the numerical tool is verified and validated in a wide range of physical conditions: Re=0.0625-50,λ=1,2,3 and a capillary number range over which drops deform and break. Good agreement with literature data is observed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Multiphase Flow - Volume 59, February 2014, Pages 24-43
نویسندگان
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