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Combined Experimental and Numerical Flow Field Study of Inclined Louvered Fins

机译:倾斜百叶鳍的实验与数值流场联合研究

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摘要

In this study the flow behavior within an interrupted fin design, the inclined louvered fin, is investigated experimentally through visualization and numerically through computational fluid dynamics (CFD) simulation. The inclined louvered fin is a hybrid of the offset strip fin and standard louvered fin, aimed at improved performance at low Reynolds numbers for compact heat exchangers. The flow behavior is studied in six geometrically different configurations over a range of Reynolds numbers and quantified using the concept of "fin angle alignment factor," which is related to the flow efficiency in louvered fins. The experimental data resulted in a discrete data set of local fin angle alignment factor values, which were used to validate the simulations. Using these validated cases it is shown that the graphical measurement method can be distorted by recirculation zones, resulting in erroneous values. Care should thus be taken when performing graphical measurement of the mean flow angle based on dye injection images. The transition from steady laminar to unsteady flow in inclined louvered fins is geometrically triggered and occurs at lower Reynolds numbers compared to slit fins and standard louvered fins. This property can potentially be used to further improve on the performance of interrupted fin surfaces.
机译:在这项研究中,通过可视化并通过计算流体力学(CFD)模拟对断续翅片设计(斜百叶板翅片)中的流动行为进行了实验研究。倾斜百叶板式翅片是偏置板状翅片和标准百叶板式翅片的混合体,旨在在紧凑型热交换器的低雷诺数下提高性能。在一定范围的雷诺数下,以六种几何形状不同的构型研究了流动特性,并使用“鳍角对准系数”的概念进行了量化,该系数与百叶窗式翅片的流动效率有关。实验数据产生了局部鳍角对准因子值的离散数据集,该数据集用于验证仿真。使用这些经过验证的情况表明,图形测量方法可能会因再循环区域而变形,从而导致错误的数值。因此,在基于染料注入图像进行平均流角的图形测量时,应格外小心。倾斜百叶窗式翅片中的从稳定层流到非稳态流的转变是几何触发的,并且与狭缝翅片和标准百叶窗式翅片相比,在较低的雷诺数下发生。此属性可以潜在地用于进一步改善中断的鳍表面的性能。

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