Arrays of surface ribs have been reported to significantly enhance particle collection efficiency in particle removal devices. However, the surface ribs also cause a higher pressure drop. Therefore, the overall performance needs to take into consideration the above factors. In this study, different forms of surface ribs inspired by nature were designed and parametric studies were performed to enhance deposition efficiency. Our parametric studies comprised three different aspects: geometry of the patterned surface, pitch-to-height ratio, and particle size. The flow field around patterned surfaces was simulated in a two-dimensional channel flow by using the Reynolds stress model, corrected by turbulence velocity fluctuation in the wall-normal direction. The particle trajectory was solved by using Lagrangian particle tracking. When the overall efficiency ratio was considered, a semi-circular pattern had the best overall efficiency with 1137 times increase when compared to the case without patterns. Although the open-circular pattern has the minimum particle deposition enhancement, the overall efficiency of the open-circular pattern has 862 times increase compared to the case without patterns. Surface ribs (semi-circular, triangular and rectangular) can achieve a higher particle deposition velocity, but a higher flow resistance is generated compared with applying the open-circular surface ribs. The deposition location was then investigated for different surface ribs at different pitch-to-height ratios (p/e). This study shows that the semi-circular surface pattern should be recommended to enhance the overall performance of particle removal devices, especially for submicron particles.

中文翻译：

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生物启发的图案化表面，用于在完全发达的湍流管道中沉积亚微米颗粒

据报道，表面肋的阵列显着提高了颗粒去除装置中的颗粒收集效率。然而，表面肋也引起较高的压降。因此，总体性能需要考虑上述因素。在这项研究中，设计了受自然启发的不同形式的表面肋，并进行了参数研究以提高沉积效率。我们的参数研究包括三个不同方面：图案化表面的几何形状，间距与高度的比率以及粒径。使用雷诺应力模型在二维通道流中模拟了图案化表面周围的流场，并通过壁法线方向的湍流速度波动进行了校正。通过使用拉格朗日粒子跟踪解决了粒子轨迹。当考虑整体效率比时，与没有图案的情况相比，半圆形图案具有最佳的整体效率，增加了1137倍。尽管空心圆形图案具有最小的颗粒沉积增强，但是与没有图案的情况相比，空心圆形图案的总效率提高了862倍。表面肋（半圆形，三角形和矩形）可以实现更高的颗粒沉积速度，但是与应用开放圆形表面肋相比，可以产生更高的流阻。然后针对不同的表面肋以不同的螺距与高度之比（p / e）研究沉积位置。这项研究表明，应建议使用半圆形表面图案，以提高除尘装置的整体性能，