Natural Convection in a Corrugated Enclosure With Mixed Boundary Conditions
Natural Convection in a Corrugated Enclosure With Mixed Boundary Conditions
复制标题
DOI：
10.1115/1.2847946
复制
发表时间：
1996-02
影响因子：
2.3
通讯作者：
S. Noorshahi;C. A. Hall;E. Glakpe
中科院分区：
文献类型：
--
作者：
S. Noorshahi;C. A. Hall;E. Glakpe
本文给出了控制空气自然对流流动的二维方程（普朗特数= 0.71）的数值解。在均匀热流条件下，空气层由一个波纹表面、一个平坦的等温冷却表面和一个平坦的绝热表面包围。数值解是在一个变换的坐标系中得到的，在这个坐标系中，壳体的边界与坐标曲面重合。坐标系是用简单的代数表达式生成的。采用数值格式进行参数传热计算。所研究的参数范围包括：修正的瑞利数高达10{sup 6}，振幅长宽比从0到0.4，倾角为30、60和90度，单位长度的圈闭值为4/5和4的循环次数。所研究的所有参数对传热和流体流动都有不同程度的影响。除了通常的修正瑞利数对自然对流的影响外，随着封闭幅值比的增大，伪传导区域也随之增大。沿波纹表面的温度分布表明，在等温条件下获得的相关性不能用于所研究的能量传递系统的设计或分析。«少
Numerical solutions to the two-dimensional equations governing natural convective flow of air (Prandtl number = 0.71) contained in an enclosure with varying angles of inclination to the horizontal axis have been obtained. The air layer is bounded by a corrugated surface under uniform heat flux conditions, a flat isothermal cooled surface and around the edges by flat adiabatic surfaces. The numerical solutions are obtained in a transformed coordinate system in which the boundaries of the enclosure coincide with coordinate surfaces. The coordinate system is generated with simple algebraic expressions. The numerical scheme is employed in performing parametric heat transfer calculations. The range of parameters investigated include: modified Rayleigh numbers up to 10{sup 6}, amplitude aspect ratio from 0 to 0.4, inclination angles of 30, 60, and 90 degrees, and number of cycles per unit length of enclosure values of 4/5 and 4. All parameters investigated have varying degrees of influence on the heat transfer and fluid flow. In addition to the usual influence of the modified Rayleigh number on natural convective flows, the region of pseudo-conduction is increased as the enclosure amplitude ratio is increased. The distributions of temperature along the corrugated surface suggest that correlations obtained under isothermal conditionsmore » cannot be employed in the design or analysis of the energy transfer system investigated.« less