کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7053113 1457464 2018 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Partitioning effect on natural convection in a circular enclosure with an asymmetrically placed inclined plate
ترجمه فارسی عنوان
اثر پارتیشن بندی بر محصوالت طبیعی در یک محفظه دایره ای با یک ورق تمایل نامتقارن قرار دارد
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
This work presents a numerical investigation on steady-state laminar natural convection in a circular enclosure with an inner flat plate at Ra = 106. The plate is inclined placed along the radial direction but is asymmetric about the center of enclosure, with eccentricity defined as the distance between the centers of two entities. The enclosure and plate are kept at low and high temperatures, respectively. The objective of this study is to explore the effects of two significant parameters, i.e., eccentricity (r) and inclination (α) of the plate, on the flow and heat transfer characteristics of the enclosure-plate system. The numerical simulation is performed using our in-house fourth-order finite difference code which is well validated. The effects of the two parameters are analyzed by the total heat transfer rate, temperature distribution, formation and evolution of various vortices, and distribution of local heat transfer rate for r/D = 0.00(0.05)0.20 and α = 0°(5°)180° where D is the enclosure diameter. Numerical results reveal that natural convection is weakened by the partitioning effect of nearly horizontal plate since fluid circulation is greatly constrained, while the effect is minor at low and high inclinations where fluid circulation is pronounced. Depending on the eccentricity and inclination, there could be at most two and three vortices in the left and right halves of the enclosure, respectively, whose formation and spatial evolution behaviors and intensity variations exhibit complex patterns, and are closely related with the heat transfer characteristics. For high eccentricity configurations, the heat transfer in the gap can be dominated by either convection or conduction depending on the gap size, the latter of which is characterized by the expected linear variation of circumferential position of maximum local heat transfer rate with the inclination.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Communications in Heat and Mass Transfer - Volume 90, January 2018, Pages 11-22
نویسندگان
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