کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4994997 1458485 2017 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Three dimensional phase-field investigation of droplet formation in microfluidic flow focusing devices with experimental validation
ترجمه فارسی عنوان
بررسی سه بعدی فاز میدان تشکیل قطرات در دستگاه های تمرکز جریان مایکروویو با اعتبار سنجی تجربی
کلمات کلیدی
مدل سازی فاز میدان، تشکیل قطره، تمرکز جریان مایکروفیویدی قطره قطره،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
In this paper, the droplet formation process at a low capillary number in a flow focusing micro-channel is studied by performing a three-dimensional phase field benchmark based on the Cahn-Hilliard Navier-Stokes equations and the finite element method. Dynamic moving contact line and wetting condition are considered, and generalized Navier boundary condition (GNBC) is utilized to demonstrate the dynamic motion of the interface on wall surface. It is found that the mobility parameter plays a very critical role in the squeezing and breakup process to control the shape and size of droplets. We define the characteristic mobility Mc to represent the correct relaxation time of the interface. We also demonstrate that the characteristic mobility is associated with the physical process and should be kept as a constant as the product of the mobility tuning parameter χ and the square of interfacial thickness ε2. This criterion is applied for different interfacial thicknesses to correctly capture the physical process of droplet formation. Moreover, the size of the droplet, the velocity of the droplet along the downstream, and the period of droplet formation are compared between the numerical and experimental results which agree with each other both qualitatively and quantitatively. The presented model and criterion can be used to predict the dynamic behavior and movement of multiphase flows.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Multiphase Flow - Volume 93, July 2017, Pages 130-141
نویسندگان
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