Towards understanding of spreading and detachment during droplet impact onto a hemispherical surface

Dhabekar, Prajwal Prakashrao; Sahoo, Prakasha Chandra; Senapati, Jnana Ranjan; Rana, Basanta Kumar

doi:10.1016/j.euromechflu.2023.03.001

Cited by 6 publications

(1 citation statement)

References 40 publications

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“…This computational study uses an Eulerian approach grid-based volume of fluid (VOF) methodology. − The open-source solver Gerris , is employed to carry out the simulations to characterize the present interfacial phenomena. This solver uses multilevel, adaptive, and structured cells to generate a mesh inside the simulation domain, as shown in Figure .…”

Section: Numerical Methodologymentioning

confidence: 99%

Influence of the Immersion Ratio of a Revolving Roller on the Film Coating and Entrainment Dynamics

Panda

Rana

2023

Ind. Eng. Chem. Res.

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The present study reports a thorough physical understanding of the film coating and air cusp entrainment dynamics in a viscous liquid pool caused by a partially immersed revolving roller. A wide range of submergence ratios of the roller are considered to understand the detailed insightful physics. The dimensionless form of the submergence ratio is defined as the ratio of the height immersion to the diameter of the roller (S/D). Finite volume-based open-source Gerris is employed to carry out the numerical simulations. Furthermore, several influencing parameters such as roller speed (measured by the capillary number, Ca), submergence ratio (S/D), strength of gravitational pull (described by using the Archimedes number, Ar), and strength of the viscous drag (determined by using the Morton number, Mo) are employed to characterize the behavior of film thickness (h*), height of the liquid cusp (Y s *), width of the air cusp (H*), and depth of the entrainment (θ*) thoroughly. Two distinguished regimes are identified at the critical capillary number (Ca c ) by carrying out a meticulous analysis of computational results. Again, the travel rate of the film tip from the receding to the advancing junction is predicted, and a slower travel rate of the film tip is found at a greater S/ D than at a lower value. The behavior of bubble ejection at the cusp tip forms an engrossing bubble train, and the ejection frequency shows a strong dependency on Ca and S/D. We have also proposed various correlations to predict the film thickness, cusp width, and cusp length. The correlations show satisfactory agreement within ±5% of computational data points.

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Section: Numerical Methodologymentioning

confidence: 99%

Influence of the Immersion Ratio of a Revolving Roller on the Film Coating and Entrainment Dynamics

Panda

Rana

2023

Ind. Eng. Chem. Res.

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Mechanism of collision and drainage of liquid droplet around sphere placed within a hollow cylinder

Sahoo,

Senapati,

Rana

2024

Computers & Fluids

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Characterization of droplet impact dynamics onto a stationary solid torus

Sahoo,

Senapati,

Rana

2024

Physics of Fluids

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The impingement mechanism of a liquid droplet on a solid torus surface is demonstrated using numerical simulations and an analytical approach. A computational model employing the volume of fluid method is developed to conduct simulations for the present investigation. Several influencing parameters, namely, diameter ratio (Dt/Do), contact angle (θ), initial droplet velocity (described by Weber number, We), surface tension (specified by Bond number, Bo), and viscosity of liquid drop (described by Ohnesorge number, Oh) are employed to characterize the impacting dynamics of a water drop onto a stationary toroidal substrate. The pattern of temporal and maximum deformation factors is elaborated by considering various relevant influencing factors to describe the fluidic behavior of the drop impingement mechanism. The key findings indicate that the developed central film gets ruptured at the early stage when the value of Dt/Do is lower because a relatively thin film is developed. Concomitantly, the very tiny drops get pinched off at Dt/Do= 0.83, whereas the detached drops are relatively large-sized in the case of lower Dt/Do= 0.16 due to the higher drainage rate of liquid mass through the hole at lower Dt/Do. It is also revealed that the first pinch-off is found to be faster with the continual upsurge of We for a specific value of Dt/Do and θ. Aside from that, efforts are made to show a scattered regime map in order to differentiate the pattern of droplet configuration during impingement. We have also attempted to establish a correlation that effectively characterizes the maximum deformation factor, which closely matches with the numerical findings. The developed correlation exhibits a firm agreement with the numerical data within deviations of 8.5%. Finally, an analytical framework is formulated to predict the deformations factor, which closely agrees with the computational findings.

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Towards understanding of spreading and detachment during droplet impact onto a hemispherical surface

Cited by 6 publications

References 40 publications

Influence of the Immersion Ratio of a Revolving Roller on the Film Coating and Entrainment Dynamics

Influence of the Immersion Ratio of a Revolving Roller on the Film Coating and Entrainment Dynamics

Mechanism of collision and drainage of liquid droplet around sphere placed within a hollow cylinder

Characterization of droplet impact dynamics onto a stationary solid torus

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