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A numerical study of the mixed convection around slanted-pin fins on a hot plate in vertical and inclined channels

机译:垂直倾斜通道中热板上倾斜销翅片混合对流的数值研究

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The mixed-convective heat transfer of slanted-pin fins on an inclined hot surface was studied numerically under the laminar flow condition. The computational model was constructed using the periodic boundary conditions in the lateral direction of fins. Adopting the Boussinesq approximation, the three-dimensional governing equations for fluid flow and heat transfer were solved using the SIMPLE algorithm. The effects of fin-inclination angles in the range of -45° to + 45° were investigated for the Richardson numbers ranging from 0.3-10, by changing the temperature of the hot plate. The effects of channel-inclination from 90° (vertical) to 0° (horizontal) were also investigated. In a vertical channel, it was found that as the buoyancy-driven flow increased, the thermal performance of the positively inclined fins became superior to the negatively inclined fins. However, in a horizontal channel, the thermal performance of the negatively inclined fins was superior for all the Richardson numbers. Details of the flow and heat transfer characteristics were summarized with respect to the channel-inclination angle in quantitative as well as qualitative ways. Difference in the heat transfer characteristic between the channel flow and open external flow was captured, which is important in the practical application.
机译:在层流条件下数量地研究倾斜热表面上的倾斜销翅片的混合对流传热。使用翅片的横向方向上的周期边界条件构建计算模型。采用Boussinesq近似,使用简单算法解决了用于流体流动和传热的三维控制方程。通过改变热板的温度,研究了为Richardson编号测量的Richardson号码范围为-45°至+ 45°范围的翅片角度的影响。还研究了通道倾斜度从90°(垂直)至0°(水平)的影响。在垂直通道中,发现随着浮力驱动的流量增加,正倾斜翅片的热性能变得优于呈负倾斜的翅片。然而,在水平通道中,对所有Richardson数量的负面性能优于所有的Richardson数字。关于定量和定性方式的通道倾斜角度总结了流动和传热特性的细节。捕获通道流和打开外流之间的传热特性的差异,这在实际应用中是重要的。

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