کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
662391 1458185 2005 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
MHD natural convection in a laterally and volumetrically heated square cavity
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
MHD natural convection in a laterally and volumetrically heated square cavity
چکیده انگلیسی

A numerical study is presented of unsteady two-dimensional natural convection of an electrically conducting fluid in a laterally and volumetrically heated square cavity under the influence of a magnetic field. The flow is characterized by the external Rayleigh number, RaE, determined from the temperature difference of the side walls, the internal Rayleigh number, RaI, determined from the volumetric heat rate, and the Hartmann number, Ha, determined from the strength of the imposed magnetic field. Starting from given values of RaE and Ha, for which the flow has a steady unicellular pattern, and gradually increasing the ratio S = RaI/RaE, oscillatory convective flow may occur. The initial steady unicellular flow for S = 0 may undergo transition to steady or unsteady multicellular flow up to a threshold value, RaI,cr, of the internal Rayleigh number depending on Ha. Oscillatory multicellular flow fields were observed for S values up to 100 for the range 105–106 of RaE studied. The increase of the ratio S results usually in a transition from steady to unsteady flow but there have also been cases where the increase of S results in an inverse transition from unsteady to steady flow. Moreover, the usual damping effect of increasing Hartmann number is not found to be straightforward connected with the resulting flow patterns in the present flow configuration.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 48, Issue 16, July 2005, Pages 3443–3453
نویسندگان
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