Turbulent mixed convective heat transfer in a ventilated enclosure with a cylindrical/cubical heat source: a 3D analysis

被引：7
作者：
Chati, Djelloul [1 ]
Bouabdallah, Said [1 ]
Ghernaout, Badia [1 ]
Tuncbilek, Ekrem [2 ]
Arici, Muslum [2 ]
Driss, Zied [3 ]
机构：
[1] Univ Laghouat, Lab Mech, LME, Laghouat, Algeria
[2] Kocaeli Univ, Mech Engn Dept, TR-41001 Kocaeli, Turkey
[3] Natl Sch Engn Sfax, LASEM Lab, Sfax, Tunisia
来源：
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS | 2023年 / 45卷 / 04期
关键词：
Ventilation; mixed convection; numerical simulation; heat source shape; 3D flow; SQUARE CAVITY; AIR-FLOW; NANOFLUID; ELEMENT;
D O I：
10.1080/15567036.2021.1923872
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
A numerical study of three-dimensional turbulent mixed convection in a ventilated, thermally insulated cavity containing a hot body (cylindrical or cubical) is conducted. The cavity has an inlet and an outlet in the bottom of the left wall and at the top of the right wall, respectively. The governing equations are solved using the finite volume method, and realizable k-epsilon turbulence model is adopted to predict turbulence. The influence of hot body on the ventilation efficiency is analyzed in terms of pathlines, temperature field, average Nusselt number (Nu(avg)), turbulence characteristics and shape of the hot body by considering different Richardson numbers ranging from Ri = 0.01 to 30. A strong dependence between the heat transfer characteristic and Richardson number is observed, and the heat body geometry plays a significant role in ventilation efficiency. The average Nusselt number is significantly affected when Ri < 1; however, it remained nearly constant for values of Ri > 10. The Nu(avg) values on the cylindrical heat source are lower compared to those of the cubical heat source; however, the ventilation efficiency of the cavity including the cylindrical heat source is better.
引用
收藏
页码：12423 / 12440
页数：18
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