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 $A_T$; 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 $4\le n\le \infty$, values of $Ra$ in the range ${10}^3$ to ${10}^7$, and values of $A_T$ in the range 0.08 to 1 were considered. The effects of $A_T,Ra$, 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.

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$\mathrm{电阻}\mathrm{一种}$; 多边形区域${\mathrm{一种}}_{吨}$; 多边形的边数，$n$; 和普朗特数$磷r$. 结果仅针对$磷r=0.7$. 的值$n$ 范围中 $4\le n\le \infty$, 值 $\mathrm{电阻}\mathrm{一种}$ 范围中 ${10}^3$ 至 ${10}^7$, 和值 ${\mathrm{一种}}_{吨}$在 0.08 到 1 的范围内被考虑。的影响${\mathrm{一种}}_{吨},\mathrm{电阻}\mathrm{一种}$， 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。