کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4994738 1458037 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermocapillary convection in a differentially heated two-layer annular system with and without rotation
ترجمه فارسی عنوان
کنسانتره ترموکاپیلا در یک سیستم حلقه دو لایه با چرخش متقاطع گرم
کلمات کلیدی
شبیه سازی عددی، جابجایی ترموکاپیلا، چرخش استریو، موج هیدروترمال، سیستم دو لایه
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Thermocapillary convection in a differentially heated bilayer annular pool consisting of 5cS silicone oil and HT-70 is investigated by a series of three-dimensional numerical simulations. Both systems with and without rotation are considered. The results indicate that the thermocapillary convection is steady and axisymmetric when the Marangoni number is small. The system rotation suppresses the radial flow in the lower layer. Once the Marangoni number exceeds a threshold value, three-dimensional oscillatory flow occurs in both layers simultaneously. The stability diagram reveals that weak rotation destabilizes the axisymmetric flow, while stronger rotation retards the onset of oscillatory flow. The wave patterns for oscillatory flow appear in the form of blade-like waves propagating outward. The surface oscillation and the interface oscillation always share a common frequency but have about a half-period phase lag. In the rotating pool, single group of curved hydrothermal waves propagates in the azimuthal direction opposite to the pool rotation. As the rotation rate increases, the wave number increases while the oscillation frequency decreases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 105, February 2017, Pages 684-689
نویسندگان
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