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Article
Numerical Investigation of Heat Transfer and Fluid Flow a cross Circular and Elliptical Tube Bank

Author: Ghassan Adnan Abd غسان عدنان عبد
Journal: University of Thi-Qar Journal for Engineering Sciences مجلة جامعة ذي قار للعلوم الهندسية ISSN: 26645564/26645572 Year: 2010 Volume: 1 Issue: 2 Pages: 84-97
Publisher: Thi-Qar University جامعة ذي قار

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Abstract

In this study, a numerical investigation of heat transfer and fluid flow a cross circularand elliptical tube bank has been made then comparisons made between these two types.The study focus on the effect of Reynolds number and ellipse eccentricity on the Nusseltnumber and pressure drop through the tube bank for two arrangements (in-line andstaggered). The results are reported for air and for Reynolds number range of20≤Re≤500. The results of the study shows that Nusselt number increased as Reynoldsnumber increased for all cases. The values of Nusselt number for elliptical tube are higherthan for circular tube for Reynolds number range of 100≤Re≤500.The pressure drop forthe two arrangements increased as the Reynolds number increases. The elliptical tubearray has batter thermal performance and lower pressure drop than circular tube array .

تم في ھذا البحث دراسة انتقال الحرارة وجریان السائل خلال نوعین من مجمعات الأنابیب عددیا. مجمع ذا أنابیبدائریة المقطع ومجمع ذا أنابیب بیضویة المقطع ثم تم المقارنة بینھما . تم دراسة تأثیر عدد رینولد و درجة تحدب المقطعالبیضوي على عدد نسلت وانخفاض الضغط خلال مجمع الأنابیب لنوعین من الترتیب ھما (الخطي والمتعرج ). النتائج20 .النتائج التي تم الحصول علیھا تشیر إلى إن عدد نسلت ≤ Re≤ المستخلصة كانت للھواء ولعدد رینولد بحدود 500یزداد مع زیادة عدد رینولد لكل الحالات . كذلك فان قیمة عدد نسلت للأنابیب البیضویة اكبر منھا للأنابیب الدائریة لقیم عدد100 .ھبوط الضغط لكلا الترتیبین یزداد بزیادة عدد رینولد . كذلك وجد إن الأنابیب البیضویة لھا ≤ Re≤ رینولد 500أفضل أداء حراري من الأنابیب الدائریة.

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Article
Prediction of Power Chimney Parameters Influenced the Operation at Nassiriya City

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Abstract

The power chimney tower is one of modern promised energy which may be developed by low losses, simple and has high facilities.
In this paper, many parameters were studied for prediction of system operation. Velocity distribution is the important parameter which gives the first prediction to put the position of erection of power turbine, made or not. The numerical analysis was presented by using GAMBIT and FLUENT 6.3 to predict that high velocity at the expansion of chimney near the solar collector place. This position is very suitable for promoting and building the power turbine since the velocity range was between (33 - 54 m/s) for different solar flux 200W/m2, 400W/m2, 600W/m2 and 800W/m2. So, the other factors, temperature and pressure were studied to coincide with previous papers in this field.

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