Numerical Simulation of Multi-Impeller High Intensity Conditioning in Fine Coal Flotation

2014 ◽  
Vol 508 ◽  
pp. 121-124 ◽  
Author(s):  
Ji Hui Li ◽  
Li Qiang Ma ◽  
Xing Wang Xiao ◽  
Wen Jing Li ◽  
Lei Xu
Keyword(s):  
Numerical Simulation ◽  
Velocity Field ◽  
Velocity Gradient ◽  
Mixing Effect ◽  
Fluid Turbulence ◽  
Coal Flotation ◽  
Fine Coal ◽  
Frame Method ◽  
Multiple Reference ◽  
Turbine Impeller

The numerical simulation of a mixing vessel with three layers of six 45° leaned blade disc turbine impeller was conducted by using the standard k-ε turbulence model and multiple reference frame method (MRF), the velocity field were analyzed. Results show that multi-impeller increases the fluid turbulence zone, strengthens the mixing effect and enhances the function of the axial velocity gradient of conditioning vessel.

Numerical Simulation for Solid-Liquid Two-Phase Flow in Stirred Vanadium Leaching Tank

2013 ◽  
Vol 456 ◽  
pp. 314-319
Author(s):  
Jian Yi Kong ◽  
Zong Wu Wu ◽  
Yu Hou ◽  
Xing Dong Wang
Keyword(s):  
Flow Field ◽  
Reference Value ◽  
Reaction Vessel ◽  
Two Phase ◽  
Mixing Effect ◽  
Vanadium Extraction ◽  
Computational Fluid Dynamics Cfd ◽  
Frame Method ◽  
Solid Liquid ◽  
Multiple Reference

The flow field in the leaching tank for the vanadium extraction in the stone coal was simulated by the Computational Fluid Dynamics (CFD) software. The flow field physical model was established by GAMBIT and the agitating area was processed by k-ε turbulence model and multiple reference frame method. The mixing effect was discussed under the two conditions: (1) Double impellers rotate in the same direction. (2) Double impellers rotate in different directions. The result shows that the mixing effect of the double impellers which rotate in different directions is better under the same condition. Its distribution of the turbulent kinetic energy is more reasonable, and it can ease the sediment at the bottom. The simulation results have certain reference value for the research of the law of the inner flow field so as to optimize its structure in the stirred reaction vessel.

Numerical Simulation of Flow Field in Burnt Lime Hydrator

2011 ◽  
Vol 383-390 ◽  
pp. 2206-2210
Author(s):  
Ming Hua Bai ◽  
Yu Zhang ◽  
Qiu Fang Wang
Keyword(s):  
Numerical Simulation ◽  
Kinetic Energy ◽  
Flow Field ◽  
Velocity Gradient ◽  
Rotational Speed ◽  
Fugitive Dust ◽  
Work Condition ◽  
Burnt Lime ◽  
Stirring Effect ◽  
Recirculation Zones

The flow field distribution in burnt lime hydrator has been investigated by a software FLUENT, with k-ε turbulence model and MRF method. The simulation result shows that when four blades deflect 30°, the whole velocity gradient of flow reduces and the recirculation zones also diminish; when the rotational speed is 75r/min, the turbulence kinetic energy of stir zone between two axes becomes larger, which can raise stirring effect and reduce fugitive dust, so it is easy to achieve the purpose of improving the environment of work condition.

scholarly journals Coal surface control for advanced fine coal flotation. Quarterly report No. 5, October 1, 1989--December 31, 1989

1990 ◽  
Author(s):  
D. W. Fuerstenau ◽  
Sastry, K. V.S. ◽  
J. S. Hanson ◽  
K. S. Narayanan ◽  
F. Sotillo ◽  
...  
Keyword(s):  
Coal Surface ◽  
Coal Flotation ◽  
Fine Coal ◽  
Surface Control

scholarly journals Investigation of the velocity field downstream of a benchmark vent using numerical simulation and hot-wire anemometry

2019 ◽  
Vol 213 ◽  
pp. 02076
Author(s):  
Jan Sip ◽  
Frantisek Lizal ◽  
Jakub Elcner ◽  
Jan Pokorny ◽  
Miroslav Jicha
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Velocity Field ◽  
Flow Field ◽  
Large Eddy Simulation ◽  
Turbulence Models ◽  
Hot Wire ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Precise Prediction

The velocity field in the area behind the automotive vent was measured by hot-wire anenemometry in detail and intensity of turbulence was calculated. Numerical simulation of the same flow field was performed using Computational fluid dynamics in commecial software STAR-CCM+. Several turbulence models were tested and compared with Large Eddy Simulation. The influence of turbulence model on the results of air flow from the vent was investigated. The comparison of simulations and experimental results showed that most precise prediction of flow field was provided by Spalart-Allmaras model. Large eddy simulation did not provide results in quality that would compensate for the increased computing cost.

Numerical Simulation of Impacts of Different Types of Air Duct Outlets on Ventilation Efficiency

2013 ◽  
Vol 438-439 ◽  
pp. 1098-1103
Author(s):  
Chun Zi Nan ◽  
Ji Ming Ma ◽  
Luo Zhao
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Velocity Distribution ◽  
Flow Velocity ◽  
Numerical Method ◽  
Concentration Effect ◽  
Mixing Zone ◽  
Mixing Effect ◽  
Ventilation Efficiency ◽  
Different Types

To enhance the exhaust efficiency during ventilation, three types of air duct outlets were imported. According to the characteristics of velocity distribution simulated by numerical method, the flow field is divided into the mixing zone and the exhaust zone. The gradual contracted air duct outlet can enhance the mixing effect between fresh air and smoke. In the exhaust zone, however, the flow velocity on the upper section of the tunnel is weakened, which is unfavorable for smoke exhaust. Gradual expanded air duct outlet, on the contrary, may weaken the concentration effect of the airflow. The flow velocity on the upper section of the tunnel is increased in the exhaust zone, thus the flow field is more homogenized, which is in favor of smoke exhaust.

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