Effect of turbulence dispersion on bubble-particle collision efficiency

2022 ◽  
Vol 177 ◽  
pp. 107374
Author(s):  
Ai Wang ◽  
Mohammad Mainul Hoque ◽  
Geoffrey Evans ◽  
Subhasish Mitra
Keyword(s):  
Particle Collision ◽  
Collision Efficiency ◽  
Turbulence Dispersion

scholarly journals Effect of Bubble Surface Properties on Bubble–Particle Collision Efficiency in Froth Flotation

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 367 ◽  
Author(s):  
Shuofu Li ◽  
Kou Jue ◽  
Chunbao Sun
Keyword(s):  
Surface Properties ◽  
Froth Flotation ◽  
Surfactant Solution ◽  
Terminal Velocity ◽  
Bubble Surface ◽  
Particle Collision ◽  
Film Rupture ◽  
Collision Efficiency ◽  
Mineral Particles ◽  
Bubble Collision

In research on the particle–bubble collision process, due to the adsorption of surfactants and impurities (such as mineral particles, slime, etc.), most studies consider the bubble surface environment to be immobile. However, in the real situation of froth flotation, the nature of the bubble surface (degree of slip) is unknown. Mobile surface bubbles increase the critical thickness of the hydration film rupture between particles and bubbles, and enhance the collision between particles and bubbles. Sam (1996) showed that when the diameter of the bubble is large enough, a part of the surface of the bubble can be transformed into a mobile state. When the bubble rises in a surfactant solution, the surface pollutants are swept to the end of the bubble, so when the bubble reaches terminal velocity, the upper surface of the bubble is changed into a mobile surface. This paper analyzes the collision efficiency and fluid flow pattern of bubbles with mobile and immobile surfaces, and expounds the influence of surface properties on collision efficiency.

Numerical investigations into the effect of turbulence on collision efficiency in flotation

2021 ◽  
Vol 163 ◽  
pp. 106744
Author(s):  
S. Li ◽  
M.P. Schwarz ◽  
Y. Feng ◽  
P. Witt ◽  
C. Sun
Keyword(s):  
Collision Efficiency ◽  
Numerical Investigations

Effect of particle collision behavior on heat transfer performance in a down-flow circulating fluidized bed evaporator

2021 ◽  
Vol 381 ◽  
pp. 55-67
Author(s):  
Feng Jiang ◽  
Hongyu Wang ◽  
Yi Liu ◽  
Guopeng Qi ◽  
Ahmed Esmail Al-Rawni ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Fluidized Bed ◽  
Heat Transfer Performance ◽  
Circulating Fluidized Bed ◽  
Particle Collision ◽  
Transfer Performance

scholarly journals CFD-DEM Simulation of Spouted Bed Dynamics under High Temperature with an Adhesive Model

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2276
Author(s):  
Zhao Chen ◽  
Lin Jiang ◽  
Mofan Qiu ◽  
Meng Chen ◽  
Rongzheng Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Particle Surface ◽  
Particle Collision ◽  
Gas Velocity ◽  
Spouted Bed ◽  
Dem Simulation ◽  
Linear Spring ◽  
Adhesion Model ◽  
Adhesive Model ◽  
Damping Model

Particle adhesion is of great importance to coating processes due to its effect on fluidization. Currently, Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) has become a powerful tool for the study of multiphase flows. Various contact force models have also been proposed. However, particle dynamics in high temperature will be changed with particle surface properties changing. In view of this, an adhesion model is developed based on approaching-loading-unloading-detaching idea and particle surface change under high temperature in this paper. Analyses of the adhesion model are given through two particle collision process and validated by experiment. Effects of inlet gas velocity and adhesion intensity on spouted bed dynamics are investigated. It is concluded that fluidization cycle will be accelerated by adhesion, and intensity of fluidization will be marginally enhanced by slight adhesion. Within a certain range, increasing inlet gas velocity will lead to strong intensity of particle motion. A parameter sensitivity comparison of linear spring-damping model and Hertz-Mindlin Model is given, which shows in case of small overlaps, forces calculated by both models have little distinction, diametrically opposed to that of large overlaps.

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