کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
653440 1457503 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of temperature dependent viscosity on the onset of Bénard–Marangoni ferroconvection
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Effect of temperature dependent viscosity on the onset of Bénard–Marangoni ferroconvection
چکیده انگلیسی

The onset of coupled Bénard–Marangoni convection in a horizontal layer of ferrofluid with viscosity depending exponentially on temperature is investigated. The lower rigid and the upper free boundaries are assumed to be insulated to temperature perturbations and the free boundary at which the surface tension effects are accounted for is assumed to be non-deformable. The resulting eigenvalue problem is solved numerically using the Galerkin technique and also analytically by a regular perturbation technique with a wave number as a perturbation parameter. The analytical and numerically computed results are found to be in concurrence. The combined effect of magnetic number M1 and the viscosity parameter B is to reinforce together and to hasten the onset of Bénard–Marangoni ferroconvection compared to their presence in isolation. Nonetheless, the effect of increasing B also shows initially some stabilizing effect on the system depending on the strength of magnetic and buoyancy forces. In addition, the nonlinearity of fluid magnetization M3 is found to have no influence on the criterion for the onset of Bénard–Marangoni ferroconvection.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Communications in Heat and Mass Transfer - Volume 51, February 2014, Pages 25–30
نویسندگان
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