scholarly journals Surface roughness effect on a droplet impacting a thin film using pseudo-potential lattice Boltzmann method

AIP Advances ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 085312
Author(s):  
Jiayu Zhou ◽  
Hao Yuan ◽  
Xiaolong He ◽  
Dianguang Ma ◽  
Chunhang Xie ◽  
...  
Keyword(s):  
Thin Film ◽  
Surface Roughness ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Roughness Effect ◽  
Boltzmann Method ◽  
Pseudo Potential

Analysis of freezing process about falling droplet using the lattice Boltzmann method

2018 ◽  
Vol 28 (10) ◽  
pp. 2442-2462 ◽  
Author(s):  
Xin Zhao ◽  
Bo Dong ◽  
Weizhong Li
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Potential Model ◽  
Horizontal Velocity ◽  
Freezing Process ◽  
Droplet Deformation ◽  
Droplet Shape ◽  
Content Type ◽  
Boltzmann Method ◽  
Pseudo Potential

Purpose The freezing phenomenon of a falling droplet is a frequently encountered phenomenon in various applications, such as spray crystallization, hail formation and artificial snowmaking. Therefore, this paper aims to understand the freezing processes of a falling droplet without and with initial horizontal velocity in a cold space. Design/methodology/approach The freezing processes of a falling droplet were characterized using a modified enthalpy-based lattice Boltzmann method. Findings The temperature field, streamlines and freezing process of the falling droplet were investigated and analyzed. The lower part of the droplet was frozen earlier than the upper part. The freezing trend slowed down in the later stage of the freezing process. The droplet shape was related to the initial vertical velocity, nucleation temperature and initial horizontal velocity. Originality/value A modified enthalpy-based lattice Boltzmann method is proposed. In the model, the improved pseudo-potential model is used and the radiation is considered. This method was firstly used to simulate the freezing process of a falling droplet. By examining these freezing processes in detail, the freezing trend and the effect factors of droplet deformation and freezing time were obtained, respectively.

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

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Jinchao He ◽  
Hao Yuan ◽  
Xiaolong He ◽  
Chunhang Xie ◽  
Haonan Peng ◽  
...  
Keyword(s):  
Thin Film ◽  
Film Thickness ◽  
Liquid Film ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Critical Value ◽  
Droplet Impact ◽  
Maximum Value ◽  
Tension Term ◽  
Boltzmann Method

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.

scholarly journals Simulations of Boiling Systems Using a Lattice Boltzmann Method

2013 ◽  
Vol 13 (3) ◽  
pp. 696-705 ◽  
Author(s):  
L. Biferale ◽  
P. Perlekar ◽  
M. Sbragaglia ◽  
F. Toschi
Keyword(s):  
Numerical Simulations ◽  
Lattice Boltzmann Method ◽  
Latent Heat ◽  
Lattice Boltzmann ◽  
Temperature Fluctuations ◽  
Convective Cell ◽  
Turbulent Convection ◽  
Multi Phase ◽  
Boltzmann Method ◽  
Pseudo Potential

AbstractWe report about a numerical algorithm based on the lattice Boltzmann method and its applications for simulations of turbulent convection in multi-phase flows. We discuss the issue of ’latent heat’ definition using a thermodynamically consistent pseudo-potential on the lattice. We present results of numerical simulations in 3D with and without boiling, showing the distribution of pressure, density and temperature fluctuations inside a convective cell.

Using the Lattice Boltzmann Method to Simulate the Heat Conduction in a Thin Film Induced by Ultra-Fast Laser

2015 ◽  
Vol 723 ◽  
pp. 896-900
Author(s):  
Yu Dong Mao ◽  
Ming Tian Xu
Keyword(s):  
Thin Film ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Laser Heating ◽  
Silicon Film ◽  
Fourier Law ◽  
Higher Temperature ◽  
Boltzmann Method ◽  
Heating Technology ◽  
Thin Silicon Film

Ultra-fast laser heating technology has been widely used in the micro-/nanodevices. The Lattice Boltzmann method (LBM) is employed to simulate the heat conductions of laser heating appeared in a thin film. The results obtained by the LBM show that a wavelike behavior is appeared, but it can not be found in Fourier prediction. Comparing the results obtained by the Fourier law and LBM, we find that the LBM solution shows higher temperature than the Fourier prediction. Moreover, simultaneously heating both surfaces of a thin silicon film by ultra-fast lasers can induce two thermal waves traveling in the opposite directions, and when they meet together, the energy will enhance significantly.

Wall roughness effect in the lattice Boltzmann method

2013 ◽  
Author(s):  
S. Di Francesco ◽  
A. Zarghami ◽  
C. Biscarini ◽  
P. Manciola
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Wall Roughness ◽  
Roughness Effect ◽  
Boltzmann Method
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