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Article
Modeling and Computational Analysis of Turbulent Free convection in Tall Enclosure Filled with Nano-Fluid

Authors: Karima E. Amori --- Qasim Kadhim Hunehen
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2014 Volume: 14 Issue: 2 Pages: 109-121
Publisher: Basrah University جامعة البصرة

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Abstract

In this work, the turbulent buoyancy driven fluid flow and heat transfer in a differentially heated tall rectangular enclosure filled with nanofluid is quantified numerically. The two dimensional governing differential equations (continuity, momentum, energy and low Reynolds number LRN k-ω turbulence equations) are discretized using the finite volume method. SIMPLE algorithm is employed to obtain stabilized solution for high Rayleigh numbers. Two types of nanofluids namely, Al2O3-water and Cu-water, were considered. The effect of Rayleigh number (1010 to 1012), diameter of nanoparticles in the range 25-100 nm, nanoparticle volume fraction in range 0-0.08 and the aspect ratio (30, 40 and 50) on fluid flow and heat transfer are investigated. The present results are compared with previously published work and a qualitative agreement with good validation is obtained. Results show that addition of nanoparticles makes the liquid be more viscous which decreases the vertical velocity component and also decreases the temperature gradient near the walls. Also an announced heat transfer enhancement is obtained with nanoparticle volume fraction reaching a maximum point called optimal volume loading, at which the maximum convective heat transfer is obtained, and then it decreased with further increase of volume fraction.Keywords: Natural convection; turbulent; tall enclosure; finite volume method; nanofluid.


Article
Computational Analysis of Turbulent Natural Convection in Water Filled Tall Enclosure
تحليل حسابي للحمل الحر المضطرب في حيز طويل مملوء بالماء

Authors: Karima E. Amori كريمة أسماعيل عموري --- Qasim Kadhim Hunehen قاسم كاظم حنيحن
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2013 Volume: 19 Issue: 11 Pages: 1467-1482
Publisher: Baghdad University جامعة بغداد

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Abstract

In this study, the turbulent buoyancy driven fluid flow and heat transfer in a differentially heated rectangular enclosure filled with water is quantified numerically. The two dimensional governing differential equations are discretized using the finite volume method. SIMPLE algorithm is employed to obtain stabilized solution for high Rayleigh numbers by a computational code written in FORTRAN language. A parametric study is undertaken and the effect of Rayleigh numbers (1010 to 1014), the aspect ratio (30, 40 and 50), and the tilt angle (10o to 170o) on fluid flow and heat transfer are investigated. The results of the adopted model in the present work is compared with previously published results and a qualitative agreement and a good validation is obtained. Results show that the fluid circulation and temperature fields are strongly affected by the enclosure tilt angle and Rayleigh Number.

تم في هذه الدراسة تقييم عددي لانتقال الحرارة وجريان المائع المضطرب والمتحرك بدافع قوة الطفو في حيز مستطيل مملوء بالماء ذو جدارين مسخنين بدرجتي حرارة مختلفتين. أعتمدت طريقة الحجوم المحددة في معالجة المعادلات التفاضلية الحاكمة ثنائية البعد. تم تطبيق منهجية SIMPLE للوصول الى حل مستقر ولقيم عدد رايلي عالية بأستخدام برنامج حسابي بلغة فورتران. اجراء دراسة لتأثير عدة متغيرات على جريان المائع وانتقال الحرارة ومن هذه المتغيرات عدد رايلي (يتراوح بين 1010 الى 1014) ، والنسبة الباعية (30,40 و 50) وزاوية ميل الحيز (من 10oالى 170o). بينت مقارنة نتائج النموذج العددي المتبع في هذا العمل مع تلك المنشورة في بحوث سابقة توافقاً جيداً. أظهرت النتائج أن تدوير المائع وتوزيع درجات الحرارة تتأثر كثيراً بزاوية ميل الحيز وبعدد رايلي.

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