کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4995637 1459001 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dynamics of an air bubble rising in a non-Newtonian liquid in the axisymmetric regime
ترجمه فارسی عنوان
دینامیک یک حباب هوا که در یک مایع غیر نیوتنی در رژیم محوری قرار دارد
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی


- Dynamics of a rising bubble in a non-Newtonian fluid.
- Increasing the shear thinning tendency increases the rise velocity, and reduces the deformations of the bubble.
- Deformation of the bubble is also enhanced for higher inertia and high surface tension.

An air bubble rising in a non-Newtonian fluid (shear thinning/thickening) has been numerically studied using a volume-of-fluid (VoF) approach in the axisymmetric regime. The governing equations consist of mass and momentum conservation, coupled to an equation for the volume fraction of the non-Newtonian fluid, which is modelled using the Carreau-Yasuda model. The solver is validated extensively by performing grid convergence test and comparing with the earlier studies in the literature. A parametric study is conducted by varying the shear-thinning/thickening tendency of the surrounding fluid for different Gallilei and Eötvös numbers. The effect of these parameters is quantified in terms of their influence on the aspect ratio of the bubble, the position of the center of gravity and the bubble shape as these evolve over time. We found that increasing the shear thinning tendency increases the rise velocity, and reduces the deformations of the bubble. The deformation of the bubble is also enhanced for higher Gallilei number and low Eötvös number.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Newtonian Fluid Mechanics - Volume 239, January 2017, Pages 53-61
نویسندگان
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