Direct numerical simulations of sessile droplet evaporation on a heated horizontal surface surrounded by moist air

Guo, Qingjie; Cheng, Ping

doi:10.1016/j.ijheatmasstransfer.2019.01.049

Cited by 42 publications

(9 citation statements)

References 35 publications

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“…Apart from the above mentioned relaxation times, the rest relaxation times in velocity and temperature fields are taken as 1. We first validate the present thermal model by considering the heat transfer in a 3D saturate liquid-vapor system [50]. As sketched in Fig.…”

Section: Validations and Discussionmentioning

confidence: 95%

An efficient thermal lattice Boltzmann method for simulating three-dimensional liquid-vapor phase change

Huang¹,

Wang²,

He³

et al. 2022

Preprint

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In this paper, a multiple-relaxation-time lattice Boltzmann (LB) approach is developed for the simulation of threedimensional (3D) liquid-vapor phase change based on the pseudopotential model. In contrast to some existing 3D thermal LB models for liquid-vapor phase change, the present approach has two advantages: for one thing, the current approach does not require calculating the gradient of volumetric heat capacity [i.e., ∇ (ρc v )], and for another, the current approach is constructed based on the seven discrete velocities in three dimensions (D3Q7), making the current thermal LB model more efficient and easy to implement. Also, based on the scheme proposed by Zhou and He [Phys Fluids 9:1591-1598, 1997], a pressure boundary condition for the D3Q19 lattice is proposed to model the multiphase flow in open systems. The current method is then validated by considering the temperature distribution in a 3D saturated liquid-vapor system, the d 2 law and the droplet evaporation on a heated surface. It is observed that the numerical results fit well with the analytical solutions, the results of the finite difference method and the experimental data. Our numerical results indicate that the present approach is reliable and efficient in dealing with the 3D liquid-vapor phase change.

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Section: Validations and Discussionmentioning

confidence: 95%

An efficient thermal lattice Boltzmann method for simulating three-dimensional liquid-vapor phase change

Huang¹,

Wang²,

He³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Nath and Ray studied the evaporation process on heterogeneous surfaces with different patterns . Guo and Cheng studied the influence of different relative humidity on the evaporation process by using the multicomponent and multiphase LB model . Qin et al used the LB model coupled with the concentration field method to simulate the evaporative formation of colloid solution in porous structures .…”

Section: Introductionmentioning

confidence: 99%

“…22 Guo and Cheng studied the influence of different relative humidity on the evaporation process by using the multicomponent and multiphase LB model. 23 Qin et al used the LB model coupled with the concentration field method to simulate the evaporative formation of colloid solution in porous structures. 24 The LB simulation, as a relatively recent mesoscopic scale simulation method, can establish complex pixel pit structures and coupling of multiple physical fields.…”

Section: ■ Introductionmentioning

confidence: 99%

Lattice Boltzmann Study of Microdroplet Evaporation Process in Pixel Pits

Chen

et al. 2023

Langmuir

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Inkjet printing has the advantages of high material utilization, low cost, and large-area production and is a promising manufacturing technology for organic light-emitting diode (OLED) displays. However, the droplet evaporation in micron-size pixel pits is highly influenced by the pit wall. Such a process is extremely difficult to control, leading to the appearance of defects such as the coffee ring in the printing process of OLED displays. In this work, a multiphase thermal lattice Boltzmann (LB) model based on multiple distribution functions is established to study the evaporation process of micron-size droplets in pits. According to the characteristics of the largest number of the three-phase contact line (TCL) appearing in the evaporation process, the evaporation modes can be divided into three types, i.e., one, two, and three TCLs. In the 1-TCL mode, the droplet stays in constant contact radius (CCR) for the shortest time; in 2-TCL and 3-TCL modes, the liquid film fracture behavior of evaporating droplets in the pit is well captured. The effects of the pit height and the contact angle on the droplet evaporation mode are investigated in detail. The phase diagrams of evaporation modes with different parameters are also established. The revealed evaporation mechanism is supposed to be useful for regulating the droplet evaporation behavior and controlling the cured film shape in the OLED printing process.

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“…As well as the application of conservation equations, VOF (volume of fluid) [ 15 ], LS (level set) [ 16 ], or arbitrary Lagrangian–Eulerian formulation [ 17 ] methods could also be combined to better correlate the processes of heat transfer and the mass transfer by tracing the liquid–air interface during the evolution of the droplet volume. Moreover, the lattice Boltzmann method is also a remarkable tool for the simulation [ 18 ] since it could trace the interface as well.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Evaporation of a Non-Spherical Sessile Droplet

et al. 2022

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To better understand the evaporation of a non-spherical droplet, a two-dimensional simulation was conducted to investigate the evaporation on the asymmetric cross-section of non-spherical sessile droplets, which are characterized by two curvatures with two different contact angles on both sides. The temperature distribution, internal flow, and evaporation flux distribution at a quasi-steady state were revealed to be different from the spherical droplets. When heated from the substrate, the lowest surface temperature moves to the side of higher curvature or larger contact angle, forming a single vortex in the droplet. This single-vortex formation continues to be enhanced by enlarging the contact angle discrepancy. Unlike spherical droplets, the smaller curvature side of a non-spherical sessile droplet will release more evaporation flux. In addition, it is found that the non-spherical sessile droplets could surpass the spherical sessile droplets in evaporation flux.

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Direct numerical simulations of sessile droplet evaporation on a heated horizontal surface surrounded by moist air

Cited by 42 publications

References 35 publications

An efficient thermal lattice Boltzmann method for simulating three-dimensional liquid-vapor phase change

An efficient thermal lattice Boltzmann method for simulating three-dimensional liquid-vapor phase change

Lattice Boltzmann Study of Microdroplet Evaporation Process in Pixel Pits

Numerical Study on the Evaporation of a Non-Spherical Sessile Droplet

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