Single drop impaction on a solid surface

Park, Heungsup; Carr, Wallace W.; Zhu, Junyong; Morris, Jeffrey F.

doi:10.1002/aic.690491003

Cited by 107 publications

(78 citation statements)

References 21 publications

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“…Thus we expect kinetic energy, surface energy and viscosity will all be important factors in determining liquid marble coverage. Plots of the coverage versus various combinations of dimensionless groups relevant to drop deformation and recoil [13,15,16], …”

Section: Accepted M Manuscriptmentioning

confidence: 43%

Liquid marble formation: Spreading coefficients or kinetic energy?

et al. 2009

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Abstract:A liquid marble is a network of self-assembled hydrophobic powder around a droplet. The mechanism and driving force leading to the formation of liquid marbles has not been investigated. In this study, the solid-liquid spreading coefficient ( SL λ ) is calculated and the effect of the impact kinetic energy on liquid marble formation for various fluids and particles is investigated. Single drops of fluid were produced using a syringe and released from different heights onto loosely packed powder bed. The degree of powder coverage over liquid droplet after impact was photographed and analysed using image analysis. The results show that the spreading coefficients do not predict liquid marble formation, but instead that powder coverage of the drop is proportional to the applied kinetic energy. As the kinetic energy is increased, the percentage of coverage of liquid droplet by powder increases, and as the particle size decreases the percentage of coverage also increases. These results demonstrate that good powder coverage is assisted by increasing the kinetic energy of impact, which increases the size of the initial fluid-powder contact area and causes internal fluid flow within the droplet during impact and rebound, which entrains the particles and forms the powder shell. The knowledge that the level of agitation applied is an important factor in whether A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 liquid marble are successfully produced, is expected to facilitate progress in creating liquid marbles as precursors to a wide range of structured powder-liquid products in cosmetics, pharmaceuticals and other advanced materials.

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Section: Accepted M Manuscriptmentioning

confidence: 43%

Liquid marble formation: Spreading coefficients or kinetic energy?

et al. 2009

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“…Fukai and coworkers [2,3] reported experimental and theoretical studies on the deformation of a droplet-the splat radius and heightimpinging on a flat surface at a high Reynolds number (Re ≈ 4500) in an axisymmetric moving mesh.Šikalo et al [4] performed experiments on drop impact and spreading and investigated the effective contact line and similar experiments by Park et al [5] using a spherical cap improved predictions for flows with low Reynolds number, low Weber number, and a large contact angle. Pasandideh-Fard et al [6] and Gunjal et al [7] performed numerical simulations on the droplet impact using a volume-of-fluid (VOF) method and Khatavkar [8] and Khatavkar et al [9] employed a diffuseinterface method to study the capillary and low inertia spreading of a micro droplet on a flat and patterned surface at low Reynolds numbers.…”

Section: Introductionmentioning

confidence: 43%

Numerical Simulations of the Impact and Spreading of a Particulate Drop on a Solid Substrate

Jeong

Hwang

Kim

2012

Modelling and Simulation in Engineering

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We present two-dimensional numerical simulations of the impact and spreading of a droplet containing a number of small particles on a flat solid surface, just after hitting the solid surface, to understand particle effects on spreading dynamics of a particle-laden droplet for the application to the industrial inkjet printing process. The Navier-Stokes equation is solved by a finite-element-based computational scheme that employs the level-set method for the accurate interface description between the drop fluid and air and a fictitious domain method for suspended particles to account for full hydrodynamic interaction. Focusing on the particle effect on droplet spreading and recoil behaviors, we report that suspended particles suppress the droplet oscillation and deformation, by investigating the drop deformations for various Reynolds numbers. This suppressed oscillatory behavior of the particulate droplet has been interpreted with the enhanced energy dissipation due to the presence of particles.

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“…Clanet et al [11] studied the impact of liquid droplets of low viscosity on a super-hydrophobic surface, and the experimental results presented the maximal spreading ratio scaled as We 1/4 , where We is the Weber number. Based on energy balance, Park et al [12] predicted the maximum deformation ratio at a low-impact velocity by experiment.…”

Section: Introductionmentioning

confidence: 45%

Maximum Deformation Ratio of Droplets of Water-Based Paint Impact on a Flat Surface

Qin

Zhang

2017

Coatings

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Abstract:In this research, the maximum deformation ratio of water-based paint droplets impacting and spreading onto a flat solid surface was investigated numerically based on the Navier-Stokes equation coupled with the level set method. The effects of droplet size, impact velocity, and equilibrium contact angle are taken into account. The maximum deformation ratio increases as droplet size and impact velocity increase, and can scale as We 1/4 , where We is the Weber number, for the case of the effect of the droplet size. Finally, the effect of equilibrium contact angle is investigated, and the result shows that spreading radius decreases with the increase in equilibrium contact angle, whereas the height increases. When the dimensionless time t* < 0.3, there is a linear relationship between the dimensionless spreading radius and the dimensionless time to the 1/2 power. For the case of 80 • ≤ θ e ≤ 120 • , where θ e is the equilibrium contact angle, the simulation result of the maximum deformation ratio follows the fitting result. The research on the maximum deformation ratio of water-based paint is useful for water-based paint applications in the automobile industry, as well as in the biomedical industry and the real estate industry. Please check all the part in the whole passage that highlighted in blue whether retains meaning before.

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Single drop impaction on a solid surface

Cited by 107 publications

References 21 publications

Liquid marble formation: Spreading coefficients or kinetic energy?

Liquid marble formation: Spreading coefficients or kinetic energy?

Numerical Simulations of the Impact and Spreading of a Particulate Drop on a Solid Substrate

Maximum Deformation Ratio of Droplets of Water-Based Paint Impact on a Flat Surface

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