2013
DOI: 10.3390/en6010204
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Numerical Simulation on Head-On Binary Collision of Gel Propellant Droplets

Abstract: Binary collision of droplets is a fundamental form of droplet interaction in the spraying flow field. In order to reveal the central collision mechanism of two gel droplets with equal diameters, an axi-symmetric form of the Navier-Stokes equations are firstly solved and the method of VOF (volume of fluid) is utilized to track the evolution of the gas-liquid free interface. Then, the numerical computation model is validated with Qian's experimental results on Newtonian liquids. Phenomena of rebound, coalescence… Show more

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Cited by 13 publications
(12 citation statements)
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“…Apart from the surface roughness, the maintenance of a stable and robust air layer that screens the contact of liquid with the solid substrate is essential to the complete bouncing of a drop. In 1879, Lord Rayleigh first observed the bouncing phenomenon between two colliding streams of drops, which was ascribed to the maintaining of an integral air cushion . The air cushion can be stabilized by many methods, such as the addition of surfactant to the drop, the vibration of underlying liquid bath, or the use of very smooth interfaces that allow for the easy air entrapment ( Figure a) .…”
Section: Approaches To Enhance Drop Mobilitymentioning
confidence: 99%
“…Apart from the surface roughness, the maintenance of a stable and robust air layer that screens the contact of liquid with the solid substrate is essential to the complete bouncing of a drop. In 1879, Lord Rayleigh first observed the bouncing phenomenon between two colliding streams of drops, which was ascribed to the maintaining of an integral air cushion . The air cushion can be stabilized by many methods, such as the addition of surfactant to the drop, the vibration of underlying liquid bath, or the use of very smooth interfaces that allow for the easy air entrapment ( Figure a) .…”
Section: Approaches To Enhance Drop Mobilitymentioning
confidence: 99%
“…Nikolopoulos et al [4][5] simulated the headon and off-centre collision of droplets by using adaptive mesh method and the result is similar to the experimental study by Qian and Law [6]. At present, most of the experimental and numerical investigations of droplet collision are both focused on hydrocarbon droplets [7][8][9][10][11][12], and there are still large gaps in concrete study of seawater droplets collision. In the present investigation, the feasibility and accuracy of numerical simulation are verified.…”
Section: Introductionmentioning
confidence: 63%
“…We consider two initially stationary droplets, which are made to coalesce with each other at the point of contact at time = 0, as illustrated in Figure 1 (6,8,8), (c) (7,8,9) and (d) (7,9,9), where the three numbers in parenthesis are the mesh levels for the gas zone, the fluid zone, and the interface zone, respectively.…”
Section: Numerical Specificationsmentioning
confidence: 99%
“…The grid independence of the computational results was examined in the study. (6,8,8), (7,8,9) and (7,9,9), respectively, which result in maximally 49,131, 79,215 and 173,451 grid points, respectively. It is seen that all the results are almost the same in terms of the evolution of droplet deformation, implying that the refinement level 6 for the gas zone and 8 for the interface zone…”
Section: Numerical Specificationsmentioning
confidence: 99%