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Natural Convective Heat Transfer from Vertical Isothermal Polygonal Cylinders
Journal of Thermophysics and Heat Transfer ( IF 1.1 ) Pub Date : 2021-06-03 , DOI: 10.2514/1.t6207
Abdulrahim Kalendar 1 , Yousuf Alhendal 1 , Shafqat Hussain 2 , Sayed Karar 1 , Patrick Oosthuizen 3
Affiliation  

A numerical study was undertaken on the laminar convective heat transfer from vertical polygonal cylinders with an uncovered top surface for a relatively small polygons area. The polygonal cylinders were perpendicularly placed on a flat adiabatic base plate, and uniform wall temperature boundary conditions were assumed. The governing equations for geometrical evaluation were solved numerically in terms of dimensionless variables using FLUENT. The numerical model has been validated with the existing experimental and empirical correlation equations. From the results obtained, mean Nusselt numbers from the polygonal cylinders were calculated using parameters such as the Rayleigh number Ra; the polygon area AT; the number of sides of the polygon, n; and the Prandtl number Pr. Results were obtained only for Pr=0.7. Values of n in the range 4n, values of Ra in the range 103 to 107, and values of AT in the range 0.08 to 1 were considered. The effects of AT,Ra, and n on the mean Nusselt number for the combined and for the individual surfaces of the polygonal cylinder are presented. Correlation equations for the mean Nusselt numbers for the side and top surfaces of the polygonal cylinders were developed.



中文翻译:

垂直等温多边形圆柱的自然对流传热

对来自垂直多边形圆柱体的层流对流热传递进行了数值研究,该圆柱体具有相对较小的多边形区域的未覆盖顶面。多边形圆柱体垂直放置在平坦的绝热底板上,假设壁温边界条件均匀。几何评估的控制方程使用 FLUENT 根据无量纲变量进行数值求解。数值模型已经用现有的实验和经验相关方程进行了验证。根据获得的结果,使用瑞利数等参数计算多边形圆柱体的平均努塞尔数电阻一种; 多边形区域一种; 多边形的边数,n; 和普朗特数r. 结果仅针对r=0.7. 的值n 范围中 4n, 值 电阻一种 范围中 103107, 和值 一种在 0.08 到 1 的范围内被考虑。的影响一种,电阻一种, 和 n显示了多边形圆柱体的组合表面和单个表面的平均努塞尔数。开发了多边形圆柱的侧面和顶面的平均努塞尔数的相关方程。

更新日期:2021-06-04
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