research centers


Search results: Found 3

Listing 1 - 3 of 3
Sort by

Article
NUMERICALSTUDY OF MIXED CONVECTION FLOWIN ALID

Author: Huda A. Al-Mayahi
Journal: KUFA JOURNAL OF ENGINEERING مجلة الكوفة الهندسية ISSN: 25230018 Year: 2018 Volume: 9 Issue: 3 Pages: 128-144
Publisher: University of Kufa جامعة الكوفة

Loading...
Loading...
Abstract

A numerical investigation of steady laminar mixed convection flow of a Copper-water nanofluid in a lid –driven cavity has been executed. In the present study, the left vertical and inclined walls are heated at constant temperature while the right vertical and inclined right walls are maintained at constant cold temperature. The bottom wall is adiabatic and moving with uniform velocity. The study has been carried out for Rayleigh number Ra= 104– 106, Reynolds number Re=20-100 and solid volume fraction of Cu nanoparticles Ø= 0-0.05. The effective viscosity and thermal conductivity of the nanofluid have been calculated by Brinkman and Maxwell-Garnett models, respectively. The results indicated that, the Nusselt number increases with increasing Ra, Re and Ø.


Article
Natural Convection Heat Transfer in Arc Shape Wall Porous Cavity Filled with Nano-Fluid

Authors: Muneer A. Ismael --- Huda A. AL-Mayahi --- Ihsan N. Jawad
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2014 Volume: 14 Issue: 2 Pages: 137-148
Publisher: Basrah University جامعة البصرة

Loading...
Loading...
Abstract

Natural convection heat transfer in porous cavity with arc shape wall filled with nanofluid is studied numerically. The right arc shape wall of the cavity is heated at constant temperature (Th) while the left wall is kept cold at constant temperature (Tc), and the other horizontal walls are thermally insulated. The governing equations of the heat transfer and nanofluid flow are solved Flex PDE software. A temperature independent nanofluids properties models are adopted. The investigated parameters are the nanoparticles volume fraction Ø= (0-0.2), Rayleigh number Ra (10-1000) and arc center Ce (1-∞). The results are presented by contour of streamlines, isotherms and the average Nusselt number. The results have showed that the average Nusselt number decreases with increasing Ce and increases with increasing Ra and Ø.


Article
Mixed Convection Heat Transfer Inside A vented Square Enclosure with Concentric Rotation Inner Cylinder
انتقال الحرارة بالحمل المختلط داخل فجوة مربعة تحوي اسطوانة داخلية متمركزة دوارة

Authors: Ahmed K. Alshara --- Falah A. Abood --- Huda A. Al-mayahi
Journal: University of Thi-Qar Journal for Engineering Sciences مجلة جامعة ذي قار للعلوم الهندسية ISSN: 26645564/26645572 Year: 2013 Volume: 4 Issue: 3 Pages: 61-78
Publisher: Thi-Qar University جامعة ذي قار

Loading...
Loading...
Abstract

Mixed convection heat transfer for laminar air flow inside a vented square enclosure with rotation inner cylinder is studied numerically The bottom wall is heated at constant temperature (Th ) while the other walls and the surfaces of the inner cylinder are adiabatic. An external flow enters the square cavity through an opening located down the left vertical wall and exits from an opening located in the upper right wall. The conservation governing equations (continuity, momentum and energy are solved by finite element method using Flex PDE software package. Results of velocity curves, isotherms and average Nusselt number show the effect of the variables: Richardson number (Ri = 0,6,10), Reynolds number (Re = 20, 50, 100 ), Prandtl number (Pr = 0.7), the dimensionless angular velocity (Ω = 0 –3) and dimensionless radius of rotating cylinder (R= 0 - 0.3) on heat transfer and flow filed. The results show that, the average Nusselt number increases with increasing Ri, Re, R and decreases with increasing Ω. The results are compared with other authors in the literature and give a good agreement.

تم في هذا البحث دراسة نظرية لانتقال الحرارة بالحمل المختلط لجريان الهواء الطباقي داخل فجوة مربعة تحتوي اسطوانة داخلية دوارة. الجدار السفلي مسخن عند درجة حرارة ثابتة (Th) أما الجدران الأخرى وكذلك سطح الاسطوانة الداخلية فتكون معزولة. الجريان الخارجي يدخل الفجوة المربعة بدرجة حرارة (Tin) خلال فتحة تقع أسفل الجدار الأيسر ويخرج من فتحة تقع في أعلى الجدار الأيمن. معادلات الحفظ الحاكمة (الاستمرارية , الزخم , الطاقة) حُلت بطريقة العناصر المحددة باستخدام الحقيبة البرمجية FlexPDE. نتائج مخططات السرعة و خطوط ثابتة درجة الحرارة وضحت تأثير المتغيرات : رقم ريتشارد (Ri = 0,6,10), رقم رينولدز ( Re =20,50,100), رقم براندل ,(Pr = 0.7)السرعة الزاوية اللابعدية (Ω=0-3) و نصف قطر الأسطوانة الدوارة اللابعدي (R=0-0.3) على انتقال الحرارة والجريان . وجد بان معدل رقم نسلت يزداد بزيادة Ri,Re ,R ويقل بزيادة Ω .النتائج قورنت مع نتائج باحثين آخرين وأظهرت نتائج جيدة.

Listing 1 - 3 of 3
Sort by
Narrow your search

Resource type

article (3)


Language

English (3)


Year
From To Submit

2018 (1)

2014 (1)

2013 (1)