Pinch-off location and time during 2D droplet impact onto a wetted stationary cylinder using the lattice Boltzmann method

Sayyari, Mohammad Javad; Naghedifar, Seyyed Ali

doi:10.1007/s40430-020-2222-9

Cited by 4 publications

(4 citation statements)

References 31 publications

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“…Depending on the extent of energy dissipation during the impact, liquid jets with different heights form some of which experience a disintegration and a pinch-off on top of the liquid pillar. This occurs due to different velocities in a pillar of the liquid that moves upward [46,47]. The process starts with elongation of a column of liquid followed by necking and partial separation, as shown in Figure 6A.…”

Section: Jet Pinch-off Modesmentioning

confidence: 99%

Dynamics of a Water Droplet Impacting an Ultrathin Layer of Oil Suspended on a Pool of Water

Dehghanghadikolaei,

Abdul Halim,

Khoshbakhtnejad

et al. 2024

Fluids

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This study investigates water droplets impacting a two-layered pool, consisting of a deep pool of water above which an ultrathin a suspended layer of silicone oil is present. Initially, the difference between the impact dynamics of water droplets on ultrathin and thick layers of oil were studied. It was found that the existence of an ultrathin layer of oil changes the impact characteristics such how aggressively the jet rises, how the dimensions of the impact impression change, and how the jets are broken down on their tops. Then, in a series of experiments on ultrathin layers of oil, the droplet size, the velocity of the droplets upon impact, and the viscosity of the oil layers were changed to observe and measure the characteristic dimensions of the formed craters and the jets. It was observed that when the viscosity of oil layers decreased to a minimum of 1 (cSt), the jet height and crater sizes increased to their maximum value. In addition to the effect of the oil viscosity, it was found that the droplet size and the release heights of the droplets were in the next orders of significance in determining the impact dynamics. The impacts were also characterized qualitatively by specifically looking into the crown and crater formations, pinch-off modes in jets, and number of formed secondary droplets. As well as the quantitative conclusion, it was found that the major affecting parameter in changing each of these qualities was the viscosity of the suspended oil layer.

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Section: Jet Pinch-off Modesmentioning

confidence: 99%

Dynamics of a Water Droplet Impacting an Ultrathin Layer of Oil Suspended on a Pool of Water

Dehghanghadikolaei,

Abdul Halim,

Khoshbakhtnejad

et al. 2024

Fluids

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“…It is a common phenomenon for liquid droplets coming into contact with solid surfaces, such as droplet falling onto plant leaves, drug coating, metallurgy, ink-jet printing, and internal combustion engines. [1] This phenomenon is often accompanied by heat and mass transfer processes between the droplets and the solid. In everyday life, when encountering scenarios involving the contact between droplets and solids accompanied by heat and mass transfer processes, people often have two types of demands.…”

Section: Introductionmentioning

confidence: 99%

On the spreading behavior of a droplet on a circular cylinder using the lattice Boltzmann method

Yang 杨,

Jin 金,

Dai 戴

2024

Chinese Phys. B

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The study of a droplet spreading on a circular cylinder under gravity was carried out using the pseudo-potential lattice Boltzmann high-density ratios multiphase model with a non-ideal Peng-Robinson equation of state. The calculation results indicate that the motion of the droplet on the cylinder can be divided into three stages: spreading, sliding, and aggregating. The contact length and contact time of a droplet on a cylindrical surface can be affected by factors such as the wettability gradient of the cylindrical wall, the Bond number, and droplet size. Furthermore, phase diagrams showing the relationship between Bond number, cylinder wall wettability gradient, and contact time as well as maximum contact length for three different droplet sizes are given. A theoretical foundation for additional research into the heat and mass transfer process between the droplet and the cylinder can be established by comprehending the variable rules of maximum contact length and contact time.

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“…The impact of droplets on solid surfaces has been extensively studied over the years [4][5][6][7], revealing a rich tapestry of phenomena influenced by factors such as droplet size, velocity, surface properties, and ambient conditions. In the meantime, some studies have been devoted to droplet impact on curved surfaces, such as cylindrical [8,9] or spherical [10,11] surfaces. Studies have also investigated the effect of surface topology on post-impact dynamics [12,13].…”

Section: -Introductionmentioning

confidence: 99%

“…Wang et al [8,18] investigated the dynamic behavior of droplet impacts on transmission lines modeled by cylindrical objects with varying wettability and size, employing numerical simulations. Sayyari et al [9,19] presented a study on pinch-off location and time dynamics during 2D droplet impact on a wetted stationary cylinder using the lattice Boltzmann method, employing a novel off-lattice boundary condition for curved boundaries.…”

Section: -Introductionmentioning

confidence: 99%

Investigation of Dynamics of a Droplet Impacting a Pair of Circular Cylinders

Ezzatneshan,

Fattahi

2024

Preprint

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This study explores the intricate dynamics of droplet impact on adjacent cylindrical surfaces. Utilizing the multiphase lattice Boltzmann method and the Allen-Cahn equation, the research delves into how various factors such as droplet size, velocity, surface wettability, and cylinder proximity influence the impact dynamics. It is found that increasing the distance between the cylinders enhances the penetration of the liquid phase and the maximum extent of the liquid ligament. Specifically, at certain distances, the droplet tends to reach equilibrium predominantly on one side of the cylinders, resulting in a shorter ligament length. The study also examines the impact of Reynolds and Weber numbers on droplet dynamics. A reduction in the Reynolds number diminishes the impact inertia, leading to a decrease in the initial length of the liquid ligament and the wetted surface area. Over time, however, the final length of the liquid between the cylinders and the wetted surface is higher for lower Reynolds number impacts due to less liquid separation from the cylinder surfaces. An increase in the Weber number, conversely, reduces surface tension effects relative to inertial force, causing more extensive spreading of the droplet on the cylinder surfaces and altering the movement of separated droplets post-impact. Furthermore, the study highlights the influence of surface wettability. As the contact angle increases, hydrophobic effects repel the liquid phase, resulting in more elongated droplets post-impact. At lower contact angles, the predominance of surface adhesion facilitates quicker equilibrium attainment, while higher contact angles lead to prolonged equilibrium due to oscillatory droplet behavior. These findings offer novel insights into the interactions between droplets and adjacent curved surfaces, with significant implications for optimizing industrial processes and developing new technologies in fields such as inkjet printing and spray coating.

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Pinch-off location and time during 2D droplet impact onto a wetted stationary cylinder using the lattice Boltzmann method

Cited by 4 publications

References 31 publications

Dynamics of a Water Droplet Impacting an Ultrathin Layer of Oil Suspended on a Pool of Water

Dynamics of a Water Droplet Impacting an Ultrathin Layer of Oil Suspended on a Pool of Water

On the spreading behavior of a droplet on a circular cylinder using the lattice Boltzmann method

Investigation of Dynamics of a Droplet Impacting a Pair of Circular Cylinders

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