کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
658921 1458096 2012 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mixed convection flow and heat transfer across a square cylinder under the influence of aiding buoyancy at low Reynolds numbers
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Mixed convection flow and heat transfer across a square cylinder under the influence of aiding buoyancy at low Reynolds numbers
چکیده انگلیسی
In this paper, mixed convection flow and heat transfer around a long cylinder of square cross-section under the influence of aiding buoyancy are investigated in the vertical unconfined configuration (Reynolds number, Re = 1-40 and Richardson number, Ri = 0-1). The semi-explicit finite volume method implemented on the collocated grid arrangement is used to solve the governing equations along with the appropriate boundary conditions. The onset of flow separation occurs between Re = 1-2, between Re = 2-3 and between Re = 3-4 for Ri = 0, 0.5 and 1, respectively. The flow is found to be steady for the range of conditions studied here. The friction, pressure and total drag coefficients are found to increase with Richardson number, i.e., as the influence of aiding buoyancy increases drag coefficients increase at the constant value of the Reynolds number. The temperature field around the obstacle is presented by isotherm contours at the Prandtl number of 0.7 (air). The local and average Nusselt numbers are calculated to give a detailed study of heat transfer over each surface of the square cylinder and an overall heat transfer rate and it is found that heat transfer increases with increase in Reynolds number and/or Richardson number. The simple expressions for the wake length and average cylinder Nusselt number are obtained for the range of conditions covered in this work.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 55, Issues 9–10, April 2012, Pages 2601-2614
نویسندگان
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