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Numerical Study Of Natural Convective Heat Transfer In An Inclined Square Porous Layer
دراسة عددية لانتقال الحرارة بالحمل الطبيعي في طبقة مسامية مربعة مائلة

Authors: Muyassar E. Ismaeel ميسر ادريس اسماعيل --- Amir S. Dawood أمير سلطان داؤد
Journal: AL Rafdain Engineering Journal مجلة هندسة الرافدين ISSN: 18130526 Year: 2008 Volume: 16 Issue: 3 Pages: 81-95
Publisher: Mosul University جامعة الموصل

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Abstract

AbstractIn this paper, steady two-dimensional natural convective heat transfer in an inclined square porous cavity with two parallel walls kept at constant different temperatures, while the other two parallel walls were well insulated, has been studied numerically. The governing equations have been solved using finite difference method. Results have been obtained for modified Rayleigh numbers between 0 and 300 and inclination angle between 0° (heated from below) and 90° (heated from side). The rate of heat transfer was found a strong function of modified Rayleigh number and inclination angle. The maximum heat transfer was occurred at about ( 50  ≤  ≤ 57  ) degrees of inclination. Keywords:Natural Convective Heat Transfer, Porous Medium, Inclined Enclosure.

الخلاصةفي هذا البحث ، تم إجراء دراسة عددية لانتقال الحرارة بالحمل الطبيعي المستقر ثنائي البعد في تجويف مسامي مربع الشكل له جداران متوازيان ذو درجات حرارة ثابتة ولكن مختلفة والجداران المتوازيان الآخران معزولان.حصلت الحلول للمعادلات الحاكمة بطريقة الفروق المحددة. ان معدلات انتقال الحرارة المحسوبة قدمت لعدد رالي المطور Ra* في المدى ( 0 ) الى (300 ) ولزاوية ميلان  تتغير من (0 ) (مسخن من الاسفل) الى (90) ( مسخن من الاعلى). ان الدراسة الحالية بينت ان معدل انتقال الحرارة هو دالة قوية من عدد رالي المطور و زاوية الميلان. كذلك بينت ان اقصى انتقال للحرارة يحدث عند زوايا ميلان حوالي (50 ≤  ≤ 57 ).


Article
Transient Buoyancy- Driven Laminar Convection in an Inclined Three- Dimensional Trapezoidal Enclosure

Authors: Ahmed Kadhim Hussein --- Kolsi Lioua --- Hussain H. Al-Kayiem
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2014 Volume: 14 Issue: 2 Pages: 216-228
Publisher: Basrah University جامعة البصرة

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Abstract

Numerical analysis of transient laminar threedimensionalbuoyancy-driven convection in an inclined threedimensionaltrapezoidal air-filled enclosure was investigated inthis paper. The right and left sidewalls of the enclosure arekept at constant cold temperatures. The bottom wall ismaintained at a constant hot temperature , while the top wall isconsidered adiabatic. Numerical investigation is performed forRayleigh numbers varied as 103 ≤ Ra ≤ 105 , while thetrapezoidal enclosure inclination angle is varied as 0° ≤  ≤180°. Prandtl number is considered constant at Pr = 0.71. Flowand thermal fields are presented in both two and threedimensionalpattern. Also, both local and average Nusseltnumbers are calculated and discussed. The results show thatwhen the Rayleigh number increases, the flow patterns arechanged especially in three-dimensional results and the flowcirculation increases. The minimum average Nusselt numberinside the trapezoidal cavity corresponds to the highestinclination angle [i.e., 180 ].While, the average Nusseltnumber reaches its maximum value at    30 . Moreover,when the Rayleigh number increases the average Nusseltnumber increases as expected.

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