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首页> 外文期刊>International journal of engineering and manufacturing science >Numerical Study on the Effect of Fin Geometry on Convective Heat Transfer Coefficient and Friction Factor in a Wavy Plate - Fin Passage
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Numerical Study on the Effect of Fin Geometry on Convective Heat Transfer Coefficient and Friction Factor in a Wavy Plate - Fin Passage

机译：翅片几何形状对波浪板翅片通道对流换热系数和摩擦系数影响的数值研究。

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摘要

Laminar forced convection in air (Pr =0.7) in two-dimensional wavy-plate-fin channels with sinusoidal wall corrugations is numerically simulated. Constant property, periodically developed flow in uniform wall temperature plate channels is considered. The governing equations of continuity, momentum, and energy are solved computationally using finite-volume techniques. The solution procedure is based on the SIMPLE algorithm and a non-orthogonal, non-uniform grid. All the dependent variables are stored in a non-staggered manner. Numerical solutions are obtained for different corrugation aspect ratios (γ=2A/L), plate spacing ratio (ε=S/2A) and flow rates (Re). In corrugated ducts, the flow pattern changes drastically with Reynolds number and the flow gets separated at a critical Re number. This is because of the pressure distribution ceases to be linear and local variations of pressure cause flow to separate. The size of the separation region is seen to be a function of Re, γ and ε and it increases with increasing Re and γ. With increasing ε, however, it first increases and then starts to decrease after a critical ε is reached. This behavior is also seen in the friction factor and Nusselt number results, which increase to peak values corresponding to the critical ε value, and then begin to decrease. Both friction factor and Nusselt number results are presented for different γ and ε in the two-dimensional case, for a wide range of flow conditions (100≤Re≤1000).
机译：数值模拟了正弦壁波纹的二维波浪板翅通道中的层流强迫对流（Pr = 0.7）。恒定特性，考虑在均匀的壁温板通道中周期性发展的流动。连续性，动量和能量的控制方程使用有限体积技术进行计算求解。求解过程基于SIMPLE算法和非正交，非均匀网格。所有因变量以非交错方式存储。针对不同的波纹纵横比（γ= 2A / L），板间距比（ε= S / 2A）和流量（Re）获得了数值解。在波纹管中，流型随雷诺数急剧变化，并且流以临界Re数分离。这是因为压力分布不再是线性的，并且压力的局部变化导致流量分离。分离区域的大小被视为Re，γ和ε的函数，并且随着Re和γ的增加而增加。但是，随着ε的增加，它首先增加，然后在达到临界ε之后开始减少。在摩擦系数和Nusselt数结果中也可以看到这种现象，其增大到与临界ε值相对应的峰值，然后开始减小。在二维情况下，针对宽范围的流动条件（100≤Re≤1000），针对不同的γ和ε给出了摩擦系数和Nusselt数结果。

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