کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7054388 1458018 2018 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effect of four elliptical cylinders with different aspect ratios on the natural convection inside a square enclosure
ترجمه فارسی عنوان
اثر چهار سیلندر بیضوی با نسبت های مختلف نسبت به گرمایش طبیعی داخل یک محفظه مربعی
کلمات کلیدی
پودر طبیعی روش مرزی غوطه ور، چهار سیلندر بیضوی، آرایه مستطیلی، عملکرد انتقال حرارت،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
This study conducted two-dimensional numerical simulations of the natural convection phenomena in a cold square enclosure containing four hot elliptical cylinders with a rectangular array. Rayleigh numbers in the range of 104 ≤ Ra ≤ 106 and a Prandtl number of Pr = 0.7 were considered. The immersed boundary method (IBM) was used to capture the virtual wall boundary of the cylinders based on the finite volume method (FVM). The main parameters investigated include the Rayleigh number and aspect ratio of the cylinders. The aspect ratio of the cylinders was varied in the range of 0.25⩽AR⩽4.00. The flow and thermal structures and corresponding heat transfer characteristics were investigated with respect to the transition of the flow regime from steady state to unsteady state. As a result, 〈NuCYL‾〉 increased by about 4.38% and 〈NuEN‾〉 increased by about 5.24% at AR = 4.00 with increasing AR compared to AR = 1.00 (Circular cylinder). Thus, the variation in AR has a remarkable influence on the heat transfer characteristics at the cylinder surfaces and the walls of the enclosure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 122, July 2018, Pages 491-503
نویسندگان
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