کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4992809 1457467 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Convection and instability of thermocapillary flow in a liquid bridge subject to a non-uniform rotating magnetic field
ترجمه فارسی عنوان
جابجایی و بی ثباتی جریان ترموکاپیلیرو در یک پل مایع تحت شرایط میدان مغناطیسی چرخشی غیر یکنواخت
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
A three-dimensional liquid bridge is considered in this study to numerically investigate the effects of an external non-uniform rotating magnetic field (RMF) on the thermocapillary flow in semiconductor melt under microgravity. Simulations are carried out to examine the convection and instability features of the thermocapillary flow over a range of Marangoni numbers (Ma = 15-50) under a non-uniform RMF. The present results show that applying an external non-uniform RMF enhances the maximum tangential velocity and depresses the maximum axial velocity. As a consequence, an approximately axisymmetric flow is maintained in the melt under the effect of the non-uniform RMF, which is beneficial for growing high quality crystal. Further investigation of the thermocapillary flow subject to different non-uniform RMFs (corresponding to Taylor numbers Ta = 3.8 × 102-1.86 × 104 and Rotating Reynolds number Reω = 2.2 × 104) reveals that the thermocapillary convection may undergo a transition from the approximately axisymmetric steady flow to a periodically oscillatory flow for Ma above a critical value. The critical Ma generally increases with the intensity of the non-uniform RMF.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Communications in Heat and Mass Transfer - Volume 87, October 2017, Pages 52-60
نویسندگان
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