A comparative study of the immiscibility effect on liquid drop impacting onto very thin films

Wu, Yu; Wang, Q.; Zhao, C.Y.

doi:10.1007/s00348-021-03232-5

Cited by 12 publications

(6 citation statements)

References 37 publications

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“…Moreover, we observe the fingering jet formed from the retraction of the liquid crown and eventually breakup into satellite droplets. These numerical results are consistent with the experimental phenomena (Wu et al, 2021;Lu et al, 2020). It should be noticed that the fingering breakup of the liquid crown is less obvious in previous 3D LB simulations (Sitompul and Aoki, 2019;Schwarzmeier et al, 2023), which proves our new model has a better ability to reproduce the experimental phenomenon.…”

Section: Simulation Of Droplet Splashingsupporting

confidence: 86%

A Three-Dimensional Non-Orthogonal Multiple-Relaxationtime Phase-Field Lattice Boltzmann Model for Multiphase Flows at Large Density Ratios and High Reynolds Numbers

Wang

Yang

Lei

et al. 2023

Preprint

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Section: Simulation Of Droplet Splashingsupporting

confidence: 86%

A Three-Dimensional Non-Orthogonal Multiple-Relaxationtime Phase-Field Lattice Boltzmann Model for Multiphase Flows at Large Density Ratios and High Reynolds Numbers

Wang

Yang

Lei

et al. 2023

Preprint

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“…Those could be explained in similar tests. For a drop impacting on a liquid film (Geppert et al, 2017;Wu et al, 2021), increasing film thicknesses results in an increase in splashing droplet diameter, whereas the number of droplets decreases. This result is primarily because with an increase in film thickness, the crown wall thickens, which results in the generation of splashing droplets with relatively large diameters.…”

Section: Rainfall Intensity Distribution In the X Directionmentioning

confidence: 99%

Spatial distribution characteristics of splashing rainfall caused by nappe flow impingement on a plunge pool

Sun

Yuan²,

Wei³

et al. 2023

Front. Environ. Sci.

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Splashing is the main atomization source for a jet impinging on a liquid layer. Increased understanding of splashing rainfall characteristics can help to reduce the hazard of flood discharge atomization in hydraulic engineering. In this study, the spatial distribution of splashing rainfall caused by a nappe flow impinging on a downstream water cushion was experimentally investigated. Effects of the main hydraulic factors of impingement velocity, unit discharge, and water-cushion depth on splashing were investigated. The shape of splashing rainfall contours was approximately elliptical in horizontal planes. Maximum rainfall intensity was in the surrounding impingement region, and rainfall intensity decreased with an increase in the distance between the impingement center point and measurement points. Splashing rainfall intensity increased with increases in impingement velocity and unit discharge, whereas the opposite was observed with an increase in plunge pool depth. A gamma distribution described rainfall intensity distribution in the longitudinal and vertical direction, whereas a Gaussian distribution described intensity in the transverse direction. A series of empirical relations were proposed.

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“…More details about the drop impact experimental setup can be referred to [33]. The test section is placed at the intersecting area of two convergent light beams.…”

Section: Secondary Droplet Tracking During Splashingmentioning

confidence: 99%

Volumetric particle tracking velocimetry with improved algorithms using a two-view shadowgraph system

Wu¹,

Zhao²,

Wang³

2022

Meas. Sci. Technol.

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Determining the time-resolved three-dimensional (3D) three-component (3C) velocity is essential for complex turbulent flow measurements. The current study is an extension of a recently developed temporal-spatial three-dimensional particle tracking velocimetry (TS 3D-PTV) technique established for two-view imaging systems. Two improvements have been embedded in TS 3D-PTV algorithm to improve the accuracy at high particle image densities (up to 0.03 ppp). One is using the neighboring particle information to correct the predicted positions and select the temporal particles with higher probability; the other is to iteratively optimize the 2D particle positions during the tracking process using the temporal and image information. The synthetic particle tests indicate that the correctness can be increased by 4.7-5.8%, to reach a value about 92% with the improved algorithm around 0.03 ppp. The comparative results also indicate that using an advanced particle identification algorithm can improve the correctness over 20%. Two experiments, including a buoyancy jet in water and a transient droplet splashing process, have been conducted with a two-view shadowgraph imaging system. Different tracking algorithms have been conducted to determine the 3D trajectories of seeding particles or secondary droplets comparatively. The new algorithm has shown the best performance with much longer and more reliable trajectories, which indicates the tracking interruption caused by particle overlapping is reduced. The newly developed algorithms have further improved the performance under high seeding density conditions, which makes the two-view shadowgraph 3D PTV system adaptable to more experimental conditions.

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A comparative study of the immiscibility effect on liquid drop impacting onto very thin films

Cited by 12 publications

References 37 publications

A Three-Dimensional Non-Orthogonal Multiple-Relaxationtime Phase-Field Lattice Boltzmann Model for Multiphase Flows at Large Density Ratios and High Reynolds Numbers

A Three-Dimensional Non-Orthogonal Multiple-Relaxationtime Phase-Field Lattice Boltzmann Model for Multiphase Flows at Large Density Ratios and High Reynolds Numbers

Spatial distribution characteristics of splashing rainfall caused by nappe flow impingement on a plunge pool

Volumetric particle tracking velocimetry with improved algorithms using a two-view shadowgraph system

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