Numerical study of oblique droplet impact on a liquid film

Guo, Yali; Wang, Feng; Gong, Liangyi; Shen, Shengqiang

doi:10.1016/j.euromechflu.2020.07.006

Cited by 16 publications

(7 citation statements)

References 23 publications

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“…Guo [15] have studied the effect of droplet impingement onto a static liquid film at different We; we now consider droplet collisions with dynamic film at different We(We = U 2 0 ρ l D 0 /σ) obliquely. Due to the fact that the initial impact speed directly affects the value of We, we change the We by adjusting the impact velocity.…”

Section: Effect Of Impact Velocitymentioning

confidence: 99%

“…Extensive experiments and numerical simulations have shown that a normal impact on a static liquid film is accompanied by distinct symmetrical characteristics, and the results revealed crown splash and deposition phenomena [4][5][6][7][8][9][10][11]. When a droplet impacts at an inclined angle, a distinct asymmetric feature can be produced [12][13][14][15][16][17]. Whereas droplet impingement on dynamic liquid films normally, many complex interface structures can be observed, such as bouncing, partial agglomeration, complete agglomeration, scattered holes, base crown separation, etc.…”

Section: Introductionmentioning

confidence: 99%

“…There are many studies on the effect of parameters in the droplet impact dynamic liquid film or oblique impingement [13][14][15][16]24,25]. For example: Raman et al studied the effect of parameters, including droplets gap, viscosity and gas density on the crown structure and jet flow [24].…”

Section: Introductionmentioning

confidence: 99%

“…It was indicated that when increasing the Weber number (We), the crown height on the front side of the droplet was higher, but decreased on the backside. Guo et al [15] employed a CLSVOF method to simulate a drop obliquely impacting upon a stationary film. Outcomes demonstrated that the radius of the rear side of the advancing droplet decreases with an increasing impact angle, while the crown radius of the front side increases.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Single Droplet Impingement upon Dynamic Liquid Film Obliquely

et al. 2022

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To better understand the application of droplet impingement in industry and agriculture, in this paper, the coupled level set and volume of fluid (CLSVOF) method is applied to study droplet oblique impact on a dynamic liquid film. The conclusions are the following: the downstream crown height increases and then decreases as the impact angle increases, whereas upstream crown height and spreading length decrease significantly; moreover, the spreading length and upstream crown height increase with the increase of film velocity, while the downstream crown height decreases instead. The increase of gas density inhibits both upstream and downstream crowns. When the fluid viscosity decreases or the impact velocity increases, the crown height increases significantly, which easily leads to crown rupture or droplet splash. The increase in impact velocity leads to an increase in spreading length; however, viscosity has almost no effect on the spreading length.

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Section: Effect Of Impact Velocitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Single Droplet Impingement upon Dynamic Liquid Film Obliquely

et al. 2022

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“…In addition, a mathematical model of droplet spreading is derived and verified on dynamic film. Wang and Guo [23,24] implemented numerical study to explore the influence of droplet tilted hit static liquid film on flow characteristics and heat transfer. Outcomes indicated that asymmetric characteristics of surface heat flux were observed and the impact angle had no significant effect on the average surface heat flux.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of two droplets impacting upon a dynamic liquid film

Zeng

Zhang

2022

Chinese Phys. B

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The impact of droplets on the liquid film is widely involved in industrial and agricultural fields. In recent years, plenty of works are limited to dry walls or stationary liquid films, and the research of multi-droplet impact dynamic films is not sufficient. Based on this, this paper employs a coupled level set and volume of fluid (CLSVOF) method to numerically simulate two-droplet impingement on a dynamic liquid film. In our work, the dynamic film thickness, horizontal central distance between the droplets, droplets’ initial impact speed, and simultaneously the flow velocity of the moving film are analyzed. The evolution phenomenon and mechanism caused by the collision are analyzed in detail. We find that within a certain period of time, the droplet spacing does not affect the peripheral crown height; when the droplet spacing decreases or the initial impact velocity increases, the height of the peripheral crown increases at the beginning, and then, because the crown splashed under Rayleigh–Plateau instability, this results in the reduction of the crown height. At the same time, it is found that when the initial impact velocity increases, the angle between the upstream peripheral jet and the dynamic film becomes larger. The more obvious the horizontal movement characteristics, the more restrained the crown height; the spread length increases with the increase of the dynamic film speed, droplet spacing and the initial impact velocity. When the liquid film is thicker, more fluid enters the crown, due to the crown being unstable, the surface tension is not enough to overcome the weight of the rim at the end of the crown, resulting in droplets falling off.

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