CFD simulation of flow fields and pollutant dispersion around a cubic building considering the effect of plume buoyancies

2021 ◽  
pp. 108640
Author(s):  
Huixin Ma ◽  
Xuanyi Zhou ◽  
Yoshihide Tominaga ◽  
Ming Gu
Keyword(s):  
Cfd Simulation ◽  
Pollutant Dispersion ◽  
Flow Fields

scholarly journals Design of a Turbulence Generator of Medium Consistency Pulp Pumps

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Hong Li ◽  
Haifei Zhuang ◽  
Weihao Geng
Keyword(s):  
Mathematical Model ◽  
Cfd Simulation ◽  
Liquid Structure ◽  
Flow Fields ◽  
Hydraulic Performance ◽  
Flow Section ◽  
Simple Mathematical Model ◽  
Similar Shape ◽  
Turbulence Generator

The turbulence generator is a key component of medium consistency centrifugal pulp pumps, with functions to fluidize the medium consistency pulp and to separate gas from the liquid. Structure sizes of the generator affect the hydraulic performance. The radius and the blade laying angle are two important structural sizes of a turbulence generator. Starting with the research on the flow inside and shearing characteristics of the MC pulp, a simple mathematical model at the flow section of the shearing chamber is built, and the formula and procedure to calculate the radius of the turbulence generator are established. The blade laying angle is referenced from the turbine agitator which has the similar shape with the turbulence generator, and the CFD simulation is applied to study the different flow fields with different blade laying angles. Then the recommended blade laying angle of the turbulence generator is formed to be between 60° and 75°.

CFD Simulation of Spraying with Air Jet

2012 ◽  
Vol 455-456 ◽  
pp. 228-233
Author(s):  
Wei Dong Jia ◽  
Cheng Li ◽  
Jun Lu ◽  
Ning Yang ◽  
Zhen Tao Wang
Keyword(s):  
Fluid Dynamics ◽  
Software Package ◽  
Cfd Simulation ◽  
Spray Deposition ◽  
Flow Fields ◽  
Droplet Deposition ◽  
Air Jet ◽  
Tunnel Model ◽  
Spray Droplets ◽  
Jet Velocity

Droplet drift is always an accompaniment of pesticide spraying and can cause serious consequences. In this paper, we used a computational fluid dynamics software package (FLUENT) to analyze flow fields of spraying with air jet under different conditions in the tunnel model, and compared the effect of air jet on spray deposition and drift. Results of this study indicate that air jet can act directly on the spray droplets and affect their distribution and movement. Larger jet velocity has better performance on the drift reduction and droplet deposition. Droplets in the flow fields with larger jet velocity can get more kinetic energy and arrive at the root of crops easilier. When droplets are released straight down, larger velocity of droplets can be given and better performance can be achieved either in terms of drift reduction or droplet deposition.

scholarly journals CFD simulation of PEM fuel cell performance: Effect of straight and serpentine flow fields

2012 ◽  
Vol 55 (3-4) ◽  
pp. 1540-1557 ◽  
Author(s):  
Fatemeh Hashemi ◽  
Soosan Rowshanzamir ◽  
Mashallah Rezakazemi
Keyword(s):  
Fuel Cell ◽  
Cfd Simulation ◽  
Pem Fuel Cell ◽  
Flow Fields ◽  
Cell Performance ◽  
Performance Effect ◽  
Fuel Cell Performance

scholarly journals CFD simulation of the hydrodynamics and mixing time in a stirred tank

2010 ◽  
Vol 16 (4) ◽  
pp. 379-386 ◽  
Author(s):  
Aoyi Ochieng ◽  
Maurice Onyango
Keyword(s):  
Cfd Simulation ◽  
Draft Tube ◽  
Mixing Time ◽  
Operating Cost ◽  
Flow Fields ◽  
Stirred Tank ◽  
Mixing Efficiency ◽  
Phase System ◽  
Rushton Turbine ◽  
Power Draw

Hydrodynamics and mixing efficiency in stirred tanks influence power draw and are therefore important for the design of many industrial processes. In the present study, both experimental and simulation methods were employed to determine the flow fields in different mixing tank configurations in single phase system. The laser Doppler velocimetry (LDV) and computational fluid dynamics (CFD) techniques were used to determine the flow fields in systems with and without a draft tube. There was a reasonable agreement between the simulation and experimental results. It was shown that the use of a draft tube with the Rushton turbine and hydrofoil impeller resulted in a reduction in the homogenization energy by 19.2% and 17.7%, respectively. This indicates that a reduction in the operating cost can be achieved with the use of a draft tube in a stirred tank and there would be a greater cost reduction in a system stirred by the Rushton turbine compared to that stirred by a propeller.

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