Special phenomena from a single liquid drop impact on wetted cylindrical surfaces

Liang, Gangtao; Guo, Yali; Yang, Yong; Guo, Song; Shen, Shengqiang

doi:10.1016/j.expthermflusci.2013.06.012

Cited by 85 publications

(31 citation statements)

References 30 publications

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“…In order to show the versatility of the proposed model in dealing with three-phase contact line dynamics on curved surfaces, we consider droplet impact dynamics on a circular cylinder with different wettability properties. Droplet impact onto spherical and cylindrical objects has been investigated experimentally [73][74][75][76] and numerically [77,42]. Most of these are for drop impact at large velocities (high Weber numbers).…”

Section: Test 4: Droplet Falling On a Circular Cylindermentioning

confidence: 99%

Diffuse interface modeling of three-phase contact line dynamics on curved boundaries: A lattice Boltzmann model for large density and viscosity ratios

Fakhari

Bolster

2017

Journal of Computational Physics

141

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We introduce a simple and efficient lattice Boltzmann method for immiscible multiphase flows, capable of handling large density and viscosity contrasts. The model is based on a diffuse-interface phase-field approach. Within this context we propose a new algorithm for specifying the threephase contact angle on curved boundaries within the framework of structured Cartesian grids. The proposed method has superior computational accuracy compared with the common approach of approximating curved boundaries with stair cases. We test the model by applying it to four benchmark problems: (i) wetting and dewetting of a droplet on a flat surface and (ii) on a cylindrical surface, (iii) multiphase flow past a circular cylinder at an intermediate Reynolds number, and (iv) a droplet falling on hydrophilic and superhydrophobic circular cylinders under differing conditions. Where available, our results show good agreement with analytical solutions and/or existing experimental data, highlighting strengths of this new approach.

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Section: Test 4: Droplet Falling On a Circular Cylindermentioning

confidence: 99%

Diffuse interface modeling of three-phase contact line dynamics on curved boundaries: A lattice Boltzmann model for large density and viscosity ratios

Fakhari

Bolster

2017

Journal of Computational Physics

141

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“…The majority of the previous experimental studies have employed water droplet with a wide range of diameters (several hundred micrometres to several millimetres) [27], [28]. In addition, glycerine/water mixture [29]- [31], alcohols [32], silicon oil [33]- [35], aqueous polymer solution [36], [37], single component hydrocarbons [38], [39], FC-72 [40]- [42] and non-Newtonian fluids [43] have also been used to investigate the impinging droplet phenomena. In [38] the impact behaviour of a binary fuel droplet onto a heated copper plate has been studied; the fuel droplet consisted of a mixture of n-hexane and n-decane, which have significantly different boiling temperatures.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Diesel-Fuel Droplet Impact on a Similarly Sized Polished Spherical Heated Solid Particle

et al. 2017

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The head-to-head impact of diesel-fuel droplets on a polished spherical brass target has been investigated experimentally. High-speed imaging was employed to visualize the impact process for wall surface temperatures and Weber and Reynolds numbers in the ranges of 140-340 °C, 30-850, and 210-1135, respectively. The thermohydrodynamic outcome regimes occurring for the aforementioned ranges of parameters were mapped on a We-T diagram. Seven clearly distinguishable postimpact outcome regimes were identified, which are conventionally called the coating, splash, rebound, breakup-rebound, splash-breakup-coating, breakup-coating, and splash-breakup-rebound regimes. In addition, the effects of the Weber number and surface temperature on the wettability dynamics were examined; the temporal variations of the dynamic contact angle, dimensionless spreading diameter, and liquid film thickness forming on the solid particle were measured and are reported.

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“…In this study, the Reynolds and Weber numbers as well as the film thickness showed a significant influence on the droplet splashing. To consider the effects of wetted curved substrates on the impact process, Liang et al [14] investigated the butanol droplet impingement both experimentally and numerically. They reported that at low impact velocities (% 0:19) and small curvature ratios (\0:5), the droplet rebounds, while the spreading occurs at high impact velocities.…”

Section: Introductionmentioning

confidence: 99%

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

Sayyari

Naghedifar

2020

J Braz. Soc. Mech. Sci. Eng.

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This paper focuses on pinch-off location and time during 2D droplet impact onto a wetted stationary cylinder using the lattice Boltzmann method. A general off-lattice boundary condition is implemented for the curved boundary. The boundary condition is examined by comparing the steady-state velocity profile of the Taylor-Couette flow with its analytical solution. Additionally, the spreading length of a droplet impacting a wetted stationary cylinder is shown to be in good agreement with the numerical data of the literature. In the results section, the effects of Reynolds, Weber, and Froude numbers, as well as the droplet/cylinder diameter ratio, on the pinch-off length and time are investigated. The simulations revealed that as the Froude number increases, the pinch-off time increases with a slope 1.39 times more than that of the pinch-off length decrease. Moreover, it is shown that the critical Weber number for onset of dripping process increases with increasing the Froude number or decreasing the Reynolds number.

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Special phenomena from a single liquid drop impact on wetted cylindrical surfaces

Cited by 85 publications

References 30 publications

Diffuse interface modeling of three-phase contact line dynamics on curved boundaries: A lattice Boltzmann model for large density and viscosity ratios

Diffuse interface modeling of three-phase contact line dynamics on curved boundaries: A lattice Boltzmann model for large density and viscosity ratios

Experimental Study of Diesel-Fuel Droplet Impact on a Similarly Sized Polished Spherical Heated Solid Particle

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

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