کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7058574 1458077 2013 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of thermal boundary conditions on natural convection in a square enclosure with an inner circular cylinder locally heated from the bottom wall
ترجمه فارسی عنوان
اثرات شرایط مرزی حرارتی بر روی حرارت طبیعی در یک محفظه مربعی با سیلندر داخلی دایره ای که از دیواره پایین گرمایی گرم می شود
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Two-dimensional numerical simulations are conducted for natural convection in an enclosure with an hot inner cylinder located at the center of a cold enclosure for four Rayleigh numbers of 103, 104, 105, and 106. The study focuses on the effects of the locally heated bottom wall of the enclosure on thermal and flow structures of natural convection. The results indicate negligible changes in thermal and flow structures based on variations in the size of the local heating zone on the bottom wall at Ra = 103 and 104, although there is a small variation in the convection velocity in the enclosure. At Ra = 105, small inner vortices formed in the lower part of the cylinder show significant changes in their size with increases in the size of the local heating zone. At Ra = 106, secondary vortices are generated in the lower part of the cylinder because of flow separation from the side wall. The generation and dissolution of vortices are dependent mainly on the size of the local heating zone.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 65, October 2013, Pages 435-450
نویسندگان
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