Abstract
An experimental study on free convection heat transfer from a horizontal array consists of three cylinders heated under the condition of constant surface temperature was carried out. The study included clarifying the effect of separation distance between the cylinders and the distance that separate them from a floor, on the natural convection heat transfer from the array. The study showed that the ability of the cylinders to transmit heat with free convection is a function to separation distances between the cylinders also the distance between the cylinders and the floor, as well as Rayligh number, this ability is decrease too much when the separation distance from the floor and the neighborhood cylinder is small, the reduction in heat transfer for the center cylinder was (40%) in comparison with single cylinder test at vertical and horizontal separation distance of (1/8), the thermal performance for both cylinders may be got better as the separation distance increase, where the maximum enhancement in heat transfer for the center cylinder was recorded as (11%) in comparison with single cylinder test at vertical separation distance of (1) and horizontal separation distance of (3/4). The experimental results showed that the enhancement in heat transfer increases as the separation distance from the floor being larger, and the maximum heat transfer at small heights may be at high Rayligh numbers, where for high separation distances, the maximum relative enhancement may be observed at low Rayligh numbers.
Highlights
An experimental study on free convection heat transfer from a horizontal array consists of three cylinders heated under the condition
The study included clarifying the effect of separation distance between the cylinders
the distance that separate them from a floor
Summary
عندما يكون موقع الاسطوانة في أسفل القناة وعند أدنى عدد رايلي. قدم الباحثان الظاهر ويعقوب ( )3228دراسة عملية لبيان تأثير كـل من الجدران الجانبية والأرضية كل على حـدة ،وتأثير تركيبـة من الجدران الجانبيـة مـع الأرضيـة على قابلية الاسطوانة الأفقية لتبديد الحرارة بالحمل والإشعـاع ،شمـل البحث مدى من عدد رايلي تراوح بين( 8.7 304و )1 300في حين تراوحت نسـبة المسـافة الشـاقولية إلـى القطـر مـن ( 0.00إلى ،) 0.70كذل نسبة المسافة الفاصلة الأفقية إلى القطر من( 0.00إلى ،) 3وجـد أن عـدد نسلت ينخفض بنقصـان المسافـة الفاصلـة ،كما لوحظ أن قابلية الأسطوانة علـى
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