کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7052281 1457411 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental study of natural convection in an annulus between two eccentric horizontal square ducts
ترجمه فارسی عنوان
مطالعه تجربی از گرمایش طبیعی در یک حلقه بین دو مجرای مربعی افقی غیر اکسیژن
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Free convection in an open-ended horizontal eccentric annulus between two eccentric horizontal square ducts with different eccentricities has been experimentally studied with several heat fluxes. Constant heat flux for outer duct and insulated inner square rod boundary conditions were used. The wall temperature of the outer duct was measured along the length for different eccentricities. The eccentricity ratio was changed (E = −1, −0.5, 0, 0.5, 1) in both upper (negative eccentricity) and lower direction (positive eccentricity). Results indicate that with the increase of eccentricity in both directions, the convection heat transfer coefficient decreases. Also, the lower heat transfer rate is found to be at the middle section between both ends led to maximum surface temperature. The generated Rayleigh number due to the heat flux was changed from 4 × 105 to 2.9 × 106. Empirical relations are derived from the average Nusselt number as a function of the Rayleigh number and the eccentricity ratio.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Thermal and Fluid Science - Volume 65, July 2015, Pages 65-72
نویسندگان
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