کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7053940 1458013 2018 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of thermal buoyancy on flow and heat transfer around a permeable circular cylinder with internal heat generation
ترجمه فارسی عنوان
اثر شناوری حرارتی بر جریان و انتقال حرارت در اطراف سیلندر دایره ای قابل نفوذ با تولید گرما داخلی
کلمات کلیدی
مخلوط مخلوط، سیلندر دایره ای قابل نفوذ پشتیبانی / مخالفت با شناوری، تولید گرما، پیروزی از خواب بیدار،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Mixed convection heat transfer around a permeable circular cylinder with internal heat generation in steady flow was numerically investigated by applying the finite volume method for the coupled porous and pure fluid regions with collocated body-fitted and multi-block grids. Particular emphasis is given to the dual role of thermal buoyancy in flow pattern and heat transfer performance with regard to effects of the Reynolds number (Re), Darcy number (Da), and Richardson number (Ri). Details of flow and thermal characteristics are presented in terms of streamlines, isotherms, velocity distribution, wake length, drag coefficients, and Nusselt number around a permeable cylinder. Thermal buoyancy is found to have positive or negative impact on flow and heat transfer, depending on the orientation of the interaction between buoyancy force and incoming flow. Aiding buoyancy delays or completely suppresses the onset of the recirculating wake and enhances heat transfer, while opposing buoyancy has the opposite effect. For all cases studied here, heat transfer rate from a porous cylinder is higher than that from a solid one. Results also show that drag coefficients decrease with Re for the aiding buoyancy case, while present complex development for the opposing buoyancy case. All drag coefficients and average Nusselt number (Nuave) with opposing buoyancy are smaller than those with aiding buoyancy. Also, for a high Ri  ≥  1, inverse flow appears at the rear of the cylinder due to the prominent influence of opposing buoyancy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 126, Part B, November 2018, Pages 1143-1163
نویسندگان
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