Lattice Boltzmann investigation of droplets impact behaviors onto a solid substrate

Wu, Jie; Huang, Jun-Jie; Yan, Weiwei

doi:10.1016/j.colsurfa.2015.07.043

Cited by 35 publications

(12 citation statements)

References 22 publications

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“…Most of the phenomena that droplets hit on a solid obstacle can be divided into the level of the droplets impacting horizontal wall [3][4][5][6], spherical surface [7,8] and inclined wall [9,10]. If the size and shape of solid obstacles are taken into account, solid obstacles can be categorized as spherical obstacles [7,8,11] , cylindrical obstacles and rectangular obstacles [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Simulation of droplet impacting a square solid obstacle in microchannel with different wettability by using high density ratio pseudopotential multiple-relaxation-time (MRT) lattice Boltzmann method (LBM)

et al. 2019

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In this paper, a pseudopotential high density ratio (DR) lattice Boltzmann model was developed by incorporating multi-relaxation-time collision matrix, large DR external force term, surface tension adjustment external force term, and solid–liquid pseudopotential force. It was found that the improved model can precisely capture the two-phase interface at high DR. Besides, the effects of initial Reynolds number, Weber number, solid wall contact angle (CA), ratio of obstacle size to droplet diameter (χ1), and ratio of channel width to droplet diameter (χ2) on the deformation and breakup of a droplet when impacting on a square obstacle were investigated. The results showed that with the Reynolds number increasing, the droplet will fall along the obstacle and then spread along both sides of the obstacle. Furthermore, by increasing Weber number, the breakup of the liquid film will be delayed and the liquid film will be stretched to form an elongated ligament. With decreasing of the wettability of solid particle (CA → 180°), the droplet will surround the obstacle and then detach from the obstacle. When χ1 is greater than 0.5, the droplet will spread along both sides of the obstacle quickly; otherwise, the droplet will be ruptured earlier. Furthermore, when χ2 decreases, the droplet will spread earlier and then fall along the wall more quickly; otherwise, the droplet will expand along both sides of the obstacle. Moreover, increasing the hydrophilicity of the microchannel, the droplet will impact the channel more rapidly and infiltrate the wall along the upstream and downstream simultaneously; on the contrary, the droplet will wet downstream only.

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Section: Introductionmentioning

confidence: 99%

Simulation of droplet impacting a square solid obstacle in microchannel with different wettability by using high density ratio pseudopotential multiple-relaxation-time (MRT) lattice Boltzmann method (LBM)

et al. 2019

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“…On the other side, various numerical investigations have also been introduced to the droplet dynamic behaviours research. Reference [13] reported that a higher Weber number could lead to a longer contact length for a single droplet by using LBM method. Reference [14] assessed the dielectric droplets dynamic behaviour by simulation analysis based on the Navier-Stokes equation, the Poisson equation and the Nernst-Planck equations.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Motion of Micrometer Sized Droplets of Dielectric Water-based Paint under Air Flow and Electric Field

Xu¹,

Zhang²

2018

IJMMM

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In the present study, the motion of the micrometer sized droplets of dielectric water-based paint in the air is investigated numerically. The effects of gravity, the inlet velocity of air flow and applied external positive DC electric field have been taken into account. In the first part, the motion of the droplets is simulated. It is found that the effect of gravity and inlet velocity of air flow can be neglected under our conditions. In the second part, the motions of the droplets under the external electric field are simulated to investigate the effect of electric field. Our results show that the external positive electric field can result the fall speed increase comparison with the condition under no electric field. It is also observed that impact time decreases as electric potential increases. The simulation results show that the Navier-Stokes equations coupled with other fields provide an effective approach to analyze the dynamic problems for liquid droplet. Index Terms-Droplet, level set method, electric field, water-based paint.

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“…are a few processes encountering the liquid contact with the rough surfaces. Many research groups have studied the impact and splash of liquid droplets on several substrates [11][12][13][14][15]. Moreira et al [16] reviewed the mechanism of impact and disintegration of the droplet from dry and wet solid [17] have experimentally shown that the splashing dynamics of room temperature liquid metal droplets striking on the same liquid pool was drastically different from that observed for water droplet impact on a water pool.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of spreading of impinged droplets on the curved-grooved surface

Lad

2017

J Braz. Soc. Mech. Sci. Eng.

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Impact of droplets on rough surfaces has many industrial applications. Various types of splashing and spreading of liquid droplets result due to impingement of the droplets on the different surfaces incorporating formation of satellite droplets. Dynamics of splashing and spreading is different with respect to the point of impactgroove or hill-on the grooved surface. Physics of spreading of impacted droplets on the curved-grooved surfaces is not known so far. Impact of droplets on curvedgrooved surface has been studied for a narrow range of Weber number to know the abrupt change in projected area of splashed droplets. Such abrupt change in the geometry of splashed droplets due to exaggerated elongation in the direction of groove was observed for narrow range of Weber numbers from 42 to 45. The present findings explore new direction for further fundamental research work to comprehend the physics of dynamics of impacted droplets for development of new theory helpful for spray painting, printing, and designing of shielding structures.

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Lattice Boltzmann investigation of droplets impact behaviors onto a solid substrate

Cited by 35 publications

References 22 publications

Simulation of droplet impacting a square solid obstacle in microchannel with different wettability by using high density ratio pseudopotential multiple-relaxation-time (MRT) lattice Boltzmann method (LBM)

Simulation of droplet impacting a square solid obstacle in microchannel with different wettability by using high density ratio pseudopotential multiple-relaxation-time (MRT) lattice Boltzmann method (LBM)

Simulation of Motion of Micrometer Sized Droplets of Dielectric Water-based Paint under Air Flow and Electric Field

Dynamics of spreading of impinged droplets on the curved-grooved surface

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