Laminar Natural Convection in a Horizontal Rhombic Annulus
Laminar Natural Convection in a Horizontal Rhombic Annulus
复制标题
DOI：
10.1080/10407789308902604
复制
发表时间：
1993-07
影响因子：
2
通讯作者：
F. Moukalled;H. Diab;S. Acharya
中科院分区：
文献类型：
--
作者：
F. Moukalled;H. Diab;S. Acharya
This paper presents the simulation of heat transfer and flow patterns in an enclosure between two isothermal concentric cylinders of rhombic cross sections. Four different values of the enclosure gap (Eg = 0.875, 0.75, 0.5, and 0.25) and three different rhombic angles (Ω = 10°, 20°, and 30°) are considered. At low Rayleigh numbers (103-105) the flow is weak and conduction is the dominant mode of heat transfer. Convection plays a key role starting at higher Rayleigh numbers (106-107). For all cases studied, there is no tendency for flow separation at the horizontal corners. The flow strength is found to increase with increasing rhomsic angel, increasing enclosure gap, and increasing Rayleigh number. The critical Rayleigh number at which the heat transper is influenced by convention decreases with ihcreasing gap values and increasing rhombic angle; it is as high as 106-107 for Eg = 0.25 and decreases to about 104 for Eg = 0.875.
