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首页> 外文期刊>International Journal of Thermal Sciences >A numerical study of the impact of surface roughness on heat and fluid flow past a cylindrical particle
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A numerical study of the impact of surface roughness on heat and fluid flow past a cylindrical particle

机译：表面粗糙度对通过圆柱颗粒的热和流体流动影响的数值研究

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This work is devoted to a two-dimensional numerical study of the influence of surface roughness on heat and fluid flow past a cylindrical particle. The surface roughness consists of radial notches periodically distributed on the cylinder surface. The roughness was varied using different notch shapes and heights. The Navier-Stokes equation and conservation of energy were discretized using the Finite Volume Method (FVM) onto a fixed Cartesian grid, and the Immersed Boundary Method (IBM) with continuous forcing (Khadra et al. Int. J. Numer. Meth. Fluids 34, 2000) was used to simulate heat and gas flow past a cylindrical particle with a complex geometry. A polygon and the Sutherland-Hodgman clipping algorithm were used to immerse the rough cylindrical particle into a Cartesian grid. The influence of the roughness on the drag coefficient and the surface-averaged Nusselt number was studied numerically over the range of Reynolds numbers 10 ≤ Re ≤ 200. Analyzing the numerical simulations showed that the impact of the roughness on the drag coefficient is negligible in comparison to the surface-averaged Nusselt number. In particular, the Nusselt number decreases rapidly as the degree of roughness increases. A universal relationship was found between the efficiency factor E_f, which is the ratio between Nusselt numbers predicted for rough and smooth surfaces, and the surface enlargement coefficient S_(ef).
机译：这项工作致力于表面粗糙度对通过圆柱颗粒的热和流体流动的影响的二维数值研究。表面粗糙度由周期性分布在圆柱体表面上的径向凹口组成。使用不同的缺口形状和高度来改变粗糙度。使用有限体积法（FVM）将Navier-Stokes方程和能量守恒离散化到固定的笛卡尔网格上，并使用具有连续强迫的浸入边界法（IBM）离散化（Khadra等人，Int。J. Numer。Meth。Fluids 34，2000）被用来模拟热和气体流过具有复杂几何形状的圆柱状颗粒。使用多边形和Sutherland-Hodgman裁剪算法将粗糙的圆柱粒子浸入笛卡尔网格中。在雷诺数10≤Re≤200的范围内，对粗糙度对阻力系数和表面平均Nusselt数的影响进行了数值研究。分析数值模拟表明，粗糙度对阻力系数的影响相比可忽略不计到表面平均努塞尔数。特别地，随着粗糙度的增加，努塞尔数迅速减小。在效率因子E_f和表面扩大系数S_（ef）之间存在通用关系，效率因子E_f是为粗糙和光滑表面预测的Nusselt数之间的比率。

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