Simulation of a single droplet impact onto a thin liquid film using the lattice Boltzmann method

Kharmiani, Soroush Fallah; Passandideh-Fard, Mohammad; Niazmand, Hamid

doi:10.1016/j.molliq.2016.07.092

Cited by 32 publications

(16 citation statements)

References 35 publications

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“…where p EOS is the pressure calculated by the Carnahan-Starling (C-S) EOS in our study and can be expressed as follows [31]:…”

Section: Lattice Boltzmann Methods With a Tunable Surface Tension Termmentioning

confidence: 99%

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Droplet Impact on a Moving Thin Film with Pseudopotential Lattice Boltzmann Method

Yuan

et al. 2020

Mathematical Problems in Engineering

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The pseudopotential lattice Boltzmann method (LBM) with a tunable surface tension term is applied to study a droplet impact on a moving thin film. The Re effects of dimensionless parameters on the upstream and downstream crown evolution are studied, including Reynolds number (Re), Weber number (We), liquid film thickness, and horizontal velocity of the liquid film. The movement of the liquid film causes the asymmetry development of the upstream and downstream crown. Both the instability of upstream and downstream crowns increases with the increase of Re and We, and the upstream crown becomes more prone to break up. And a critical value of film thickness exists with the height of the upstream and downstream liquid crowns reaches the maximum value. And the velocity of liquid film restrains the development of the height of the upstream and downstream crowns, but it promotes the growth of the crown radius.

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“…where p EOS is the pressure calculated by the Carnahan-Starling (C-S) EOS in our study and can be expressed as follows [31]:…”

Section: Lattice Boltzmann Methods With a Tunable Surface Tension Termmentioning

confidence: 99%

“…At last, the LB method is not a method choice for steady-state computations. Recently, the pseudopotential model of Li and Luo [30] is also applied by Kharmiani et al [31] and Yuan et al [32] to study the influence of different collision parameters on the droplet splashing on a thin film.…”

Section: Introductionmentioning

confidence: 99%

Droplet Impact on a Moving Thin Film with Pseudopotential Lattice Boltzmann Method

Yuan

et al. 2020

Mathematical Problems in Engineering

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“…In order to ensure the stability and convergence of this model, following the suggestions in the Refs. [32,45], the relaxation times in Λ were chosen as follows:…”

Section: Validation Of Contact Anglementioning

confidence: 99%

Hybrid Phase-Change Lattice Boltzmann Simulation of Vapor Condensation on Vertical Subcooled Walls

Zhao

Gao

et al. 2020

Journal of Heat Transfer

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Saturated vapor condensation on the homogenous and heterogeneous subcooled wall under gravity was numerically simulated by the improved pseudopotential phase-change multiple-relaxation-time (MRT) lattice Boltzmann (LB) method. Firstly, the phase-change MRT-LB method coupling finite different method (FDM) to solve the energy equation was verified by the D2 law of the droplet's evaporation, which improve the model could precisely realize the numerical simulation of phase change. Subsequently, effects of wall wettability and subcooling as well as the geometry structure of the heterogeneous on the dynamic behaviors of droplet's growth, coalescence and falling, temperature field and heat flux were investigated via the phase-change model. The resultsshow that for the homogeneous cooler wall, it is easier for dropwise condensation formation with decreasing the wettability of the subcooled surface, and the condensate droplets on the vertical surface are easier to coalesce and fall under the gravity. It was found that in the condensation process, the saturated vapor mainly converges near the triple-phase contact line and leads to the further growth of the condensate droplets, and there is a higher heat flux and much more isotherm folds around the triple-phase contact line than other regions. The subcooled wall with hydrophilic-hydrophobic spacing distribution is more conducive to dropwise condensation; at small subcooling, the transient average heat flux remains almost unchanged, and with the occurrence of condensation, the heat flux rapidly increases, but as wall subcooling increases further, the increases of the heat flux decreases, and when the degree of wall subcooling further increases, the transient heat flux decreases first and then increases.It also can be concluded that increasing the length of the hydrophilic spots on the heterogeneous wall, the dropwise condensation will be easier to form, but too much hydrophilic spots will not contribute to the fall of the droplets.

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“…In order to verify the thermodynamic consistency of the proposed model, the Maxwell construction theory was utilized to compare with the results predicted by the MRT LB model. A horizontal liquid film with a thickness of 50 lattice units was placed in the middle of a grid size × Nx Ny =200 × 200 square computational domain, the periodic boundary condition was employed, and the initial density field was defined as follows [45,54]…”

Section: Thermal Consistencymentioning

confidence: 99%

“…The multiple-relaxation-time coefficients and the kinematic viscosity of gas phase and liquid phase still kept the same as Section.3.1. The initial density field distribution can be defined as [54]:…”

Section: Laplace's Law and Spurious Velocitymentioning

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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Simulation of a single droplet impact onto a thin liquid film using the lattice Boltzmann method

Cited by 32 publications

References 35 publications

Droplet Impact on a Moving Thin Film with Pseudopotential Lattice Boltzmann Method

Droplet Impact on a Moving Thin Film with Pseudopotential Lattice Boltzmann Method

Hybrid Phase-Change Lattice Boltzmann Simulation of Vapor Condensation on Vertical Subcooled Walls

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)

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