کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
650403 1457278 2014 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Slow motion of spherical droplet in a micropolar fluid flow perpendicular to a planar solid surface
ترجمه فارسی عنوان
حرکت آهسته قطرات کروی در یک جریان مایع میکروپارال عمود بر سطح جامد مسطح
کلمات کلیدی
شرایط اسپین، مایکروپولار مایع، نیروی کشیدن، اثر مرزی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی

The Stokes axisymmetrical flow problem of a viscous fluid sphere moving perpendicular to an impermeable bounding surface within a micropolar stagnant fluid as well as the related problem of a micropolar fluid sphere moving perpendicular to an impermeable planar surface within a stagnant viscous fluid are considered. The fluids are considered to be incompressible, and the deformation of the fluid particle is neglected. A general solution is constructed from fundamental solutions in both cylindrical and spherical coordinate systems. As boundary conditions, continuity of velocity, continuity of shear stress and the spin–vorticity relation at the droplet surface are applied. Also the no-slip and no-spin boundary conditions are used at the impermeable plane surface. A combined analytical-numerical procedure based on collocation technique is used. The drag acting, in each case, on the fluid particle is evaluated with good convergence. Numerical results for the normalized hydrodynamic drag force versus the relative viscosity, relative separation distance between the particle and wall, micropolarity parameter (a viscosity ratio characterizing micropolar fluids) and spin parameter (a non-dimensional scalar factor relating the microrotation and vorticity at the droplet surface) are presented both in tabular and graphical forms. The results for the drag coefficient are in good agreement with the available solutions in the literature for the limiting cases.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Mechanics - B/Fluids - Volume 48, November–December 2014, Pages 266–276
نویسندگان
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