کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7061147 1459006 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical simulations of deformable particle lateral migration in tube flow of Newtonian and viscoelastic media
ترجمه فارسی عنوان
شبیه سازی عددی مهاجرت ذرات تغییر شکل در جریان لوله های نیوتنی و واسکولاستیک
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The deformation and cross-streamline migration of an elastic particle in pressure-driven flows of Newtonian and viscoelastic (Oldroyd-B, Giesekus) fluids in a cylindrical tube are studied through 3D finite element method numerical simulations. The dependences of particle deformation and migration on geometric confinement, flow strength, and fluid rheology are investigated. If the particle is initially not at the channel axis, it attains an asymmetric shape and migrates. In a Newtonian liquid, the migration is always directed towards the tube axis. A project equation is proposed for the design of a microfluidic cylindrical device aimed at focusing elastic particles on the cylinder centerline. In a viscoelastic liquid, the migration direction and velocity depend on the competition among particle deformability, fluid elasticity, and fluid viscosity shear thinning (if any). In a certain range of parameters, an unstable radial position appears, which separates the region where the migration is directed towards the axis from the region where it is directed towards the wall.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Newtonian Fluid Mechanics - Volume 234, August 2016, Pages 105-113
نویسندگان
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