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2 article(s) from Zhou, Yi

A super-oscillatory step-zoom metalens for visible light

Yi Zhou,
Chao Yan,
Peng Tian,
Zhu Li,
Yu He,
Bin Fan,
Zhiyong Wang,
Yao Deng and
Dongliang Tang

Beilstein J. Nanotechnol. 2022, 13, 1220–1227, doi:10.3762/bjnano.13.101

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Figure 1: The layout of the double-layer step-zoom metalens.

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Figure 2: Phase profiles of the front and rear metasurfaces for (a) short and (b) long focal lengths.

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Figure 3: (a) Schematic of a TiO₂ rectangular nanopillar. (b) Simulated transmittance and phase modulations o...

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Figure 4: Simulated intensity distributions for different incident angles with RCP incidence corresponding to...

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Figure 5: Simulated intensity distributions for different incident angles with LCP incidence corresponding to...

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Full Research Paper

Published 28 Oct 2022

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An investigation on the drag reduction performance of bioinspired pipeline surfaces with transverse microgrooves

Weili Liu,
Hongjian Ni,
Peng Wang and
Yi Zhou

Beilstein J. Nanotechnol. 2020, 11, 24–40, doi:10.3762/bjnano.11.3

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Figure 1: SEM photos of (a) shark skin and (b) bird feather.

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Figure 2: Computational models. a) Pipe flow model with transverse microgrooves. b) Concentric annulus flow m...

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Figure 3: Influence of grid density on the viscous drag of the pipe flow.

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Figure 4: Computational grids of the a) smooth pipeline and b) microgrooved pipeline.

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Figure 5: Comparison of SST results with DNS results. a) Mean velocity distribution of the annulus flow. b) V...

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Figure 6: Schematic diagram of the experimental setup.

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Figure 7: Specimen. a) Scaled and b) grooved pipeline in a concentric annulus flow. c) Micromorphology of the...

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Figure 8: Comparison of triplicate experimental results in an annulus flow.

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Figure 9: Comparison of average pressure differences obtained from numerical simulations and experiments.

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Figure 10: Effect of microgroove height on the drags in a) pipe flow and b) an annulus flow systems.

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Figure 11: Effects of microgroove width on the drags in a) pipe flow and b) annulus flow systems.

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Figure 12: Effect of microgroove distance on drags in a) pipe flow and b) annulus flow systems.

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Figure 13: DRR obtained from different numerical tests versus velocity in a) pipe flow and b) annulus flow sys...

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Figure 14: DRR and ratio of pressure drag to total drag versus Re in an annulus flow.

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Figure 15: Influence of the flow rate on the DRR in an annulus flow.

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Figure 16: Pressure distribution. a) Pressure contour near the groove. b) Pressure curve at the wall.

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Figure 17: Wall shear stress of a smooth and a bionic pipeline.

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Figure 18: Distribution of turbulent intensity along the radial direction.

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Figure 19: Velocity contours and streamlines near the a) smooth and b) the bionic surface.

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Figure 20: The profile of a droplet on the smooth and the bionic surface.

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Full Research Paper

Published 03 Jan 2020

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