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STUDY OF MIXED CONVECTION IN A SQUARE ENCLOSURE WITH A ROTATING CIRCULAR CYLINDER AT DIFFERENT VERTICAL LOCATIONS
دراسة للحمل المختلط داخل حيز مربع بوجود اسطوانة دائرية دوارة في مواقع عمودية مختلفة

Author: Farooq Hassan Ali فاروق حسن علي
Journal: Iraqi journal of mechanical and material engineering المجلة العراقية للهندسة الميكانيكية وهندسة المواد ISSN: 20761819 Year: 2011 Volume: 11 Issue: 2 Pages: 242-261
Publisher: Babylon University جامعة بابل

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Abstract

AbstractMixed convection in a square enclosure with a rotating circular cylinder located at different vertical locations is numerically studied. The horizontal and vertical walls are kept at constant temperature Tc, while the surface of the rotating circular cylinder is maintained at a constant temperature Th. A two dimensional solution for steady laminar mixed convection is obtained by solving governing equations in stream function-vorticity form with finite difference technique for different Richardson number (Ri=Gr/Re2) varying over the range of 0.0 to 10. Depending on the Richardson number the convection phenomena inside the enclosure becomes natural, mixed, and forced convection. For the first time this study goes to investigate the effect of changing the rotating circular cylinder positions along the vertical centerline on the fluid flow and heat transfer inside the enclosure. The phenomena inside the enclosure is analyzed through a streamlines, isothermal patterns and average Nusselt numbers. The results show that the flow field and temperature distribution inside the enclosure are strongly dependent on the Richardson numbers and the position of the rotating circular cylinder, and the enclosure has maximum heat transfer rate when the cylinder near the bottom wall (δ=0.25).

الخلاصة:242ي


Article
NUMERICAL SIMULATION OF NATURAL CONVECTION IN AN OBLIQUE ENCLOSURE FILLED WITH SILVER –WATER NANOFLUID
النمذجة العددية للحمل الحر في حيز مائل مملوء بمائع الفضة النانوي

Author: Farooq Hassan Ali فاروق حسن علي
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2016 Volume: 9 Issue: 1 Pages: 87-105
Publisher: Al-Qadisiyah University جامعة القادسية

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Abstract

In this work, a numerical simulation of natural convection in an oblique enclosure filled with silver-water nanofluid is obtained for different values of Rayleigh numbers, volume fraction and inclination angle of sloping walls. The considered oblique enclosure with left and right side walls are maintained at constant cold temperature (Tc). The horizontal top wall of enclosure is kept insulated, but the bottom is maintained at constant hot temperature (Th). The present work is utilized to obtain results in the range of Rayleigh number (103-106) , volume fraction of nanofluid varied from (0-0.2) and inclination angle of side walls are (-60o, -30o, 0o, 30o, 60o). The Prandtle number is 6.0. The governing equations in the two-dimensional are solved numerically by using finite-difference technique. Comparisons with other works are performed and the results are found to be in good agreement. The obtained results are shown in the form of stream function, isothermal lines and average Nusselt numbers. It observed from results that acute shaping wall and Ag-nanoparticles with high concentration are effective to enhance the rate of heat transfer, also; the average Nusselt number for all range of inclination angle increases with increase in the Rayleigh number and the solid volume fraction of the Nanofluid.

تمت دراسة الحمل الحر في حيز مائل يحتوي على مائع الفضة النانوي لقيم مختلفة من ارقام رالي، الحجم الجزئي، زاوية ميلان الجدار. اعتبرت الجدران الجانبية المائلة الايمن والايسر للحيز عند درجة حرارة باردة. الجدار الافقي الاعلى اعتبر معزولا، بينما كان الجدار الافقي الاسفل عند درجة حرارة ساخنة. كان رقم رالي يتراوح بين((106-103، بينما تراوح الحجم الجزئي بين ((0.2-0 وتراوحت زاوية ميلان الجدران الجانبية بين ((60o, 30o, 0o, -30o, -60o. وكان رقم برانتل يساوي .6.0 تم حل المعادلات الحاكمة لبعدين عدديا باستخدام تقنية الفروقات المحددة.جرت المقارنة مع بحوث سابقة واظهرت النتائج تطابق جيد. مثلت نتائج هذه الظاهرة بدالة الجريان، خطوط الحرارة وارقام نسلت. لقد لوحظ من النتائج ان للزوايا الحادة للجدار واضافة مائع النانوي بتراكيز عالية الاثر الكبير في تعزيز انتقال الحرارة، كذلك ان متوسط رقم نسلت لجميع زوايا الميلان يزداد بزيادة رقم رالي وكذلك زيادة تركيز المائع النانوي.

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