scholarly journals Study of the dispersion process of vehicular emissions at a specific site in Belo Horizonte using numerical simulation

2009 ◽  
Author(s):  
V. Jacomino ◽  
F. Tavares ◽  
A. Barreto ◽  
E. Dutra
Keyword(s):  
Numerical Simulation ◽  
Specific Site ◽  
Vehicular Emissions ◽  
Dispersion Process ◽  
Belo Horizonte

Dispersion of Twin Inclined Fume Jets of a Variable Height within a CrossFlow

2011 ◽  
Vol 312-315 ◽  
pp. 929-934 ◽  
Author(s):  
Amina Radhouane ◽  
Nejla Mahjoub Said ◽  
Hatem Mhiri ◽  
Georges Le Palec ◽  
Philippe Bournot
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Finite Volume Method ◽  
Single Particle ◽  
Mass Fraction ◽  
Uniform Grid ◽  
Grid System ◽  
Dispersion Process ◽  
Volume Method ◽  
The Impact

Twin elliptic inclined tandem jets are emitted within an oncoming cooler crossflow. The jets contain a non reactive fume whose dispersion is tracked all over the surrounding domain. Such a configuration may be found in chimney stacks, ships’ chimneys, etc. We propose to evaluate in the present paper the impact of the jets’ height on the resulting dispersion process. To reach this goal, a numerical simulation of a double jet model of variable height is carried out by means of the finite volume method together with a non uniform grid system. The model, validated by previous experimental data, allowed the tracking of the emitted fume by studying the evolution of a single particle contained within this fume, the Carbone dioxide (CO2) mass fraction. This is possible thanks to the assumption of handling a non reactive fume, which is adopted only to simplify the calculations. The CO2 mass fraction was mainly tracked between the emitting nozzles, in a try to find out the changes brought by the extension of the emitting jet nozzles on the flow trapped between them.

Three-Dimensional Numerical Simulation on Dispersion Process of High Pressure Hydrogen Jet

2016 ◽  
Vol 2016 (0) ◽  
pp. 0235
Author(s):  
Keisuke FUJIMOTO ◽  
Daiki MUTO ◽  
Nobuyuki TSUBOI ◽  
Makoto ASAHARA
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
Three Dimensional ◽  
Dispersion Process ◽  
Pressure Hydrogen

scholarly journals Numerical simulation of dust explosion in the spherical 20l vessel

2015 ◽  
Vol 63 (1) ◽  
pp. 289-293 ◽  
Author(s):  
Z. Salamonowicz ◽  
M. Kotowski ◽  
M. Półka ◽  
W. Barnat
Keyword(s):  
Numerical Simulation ◽  
Numerical Simulations ◽  
Combustion Process ◽  
Test Stand ◽  
Maximum Pressure ◽  
Dust Explosion ◽  
Computational Domain ◽  
Dispersion Process ◽  
Dust Dispersion ◽  
Positive Agreement

Abstract The paper presents experimental and numerical validation of the combustion process of coal and flour dust dispersed in a spherical chamber of 20 cubic decimetres volume. The aim of the study is to validate the numerical simulation results in relation to the experimental data obtained on the test stand. To perform the numerical simulations, a Computational Fluid Dynamics code FLUENT was used. Geometry of the computational domain was built in compliance with EN 14460. Numerical simulations were divided into two main steps. The first one consists in a dust dispersion process, where influence of standardized geometry was verified. The second part of numerical simulations investigated dust explosion characteristics in compliance with EN 14034. After several model modifications, outcomes of the numerical analysis shows positive agreement with both, the explosion characteristics for different dust concentration levels and the maximum pressure increase obtained on the test stand.

The Interaction of Solid or Liquid Particles and Turbulent Fluid Flow Fields—A Numerical Simulation

1979 ◽  
Vol 101 (2) ◽  
pp. 265-269 ◽  
Author(s):  
D. J. Brown ◽  
P. Hutchinson
Keyword(s):  
Numerical Simulation ◽  
Diffusion Coefficient ◽  
The Other ◽  
Dispersion Process ◽  
Turbulent Fluid Flow ◽  
One Dimensional ◽  
Constant Diffusion Coefficient ◽  
Constant Diffusion ◽  
Bounded System

Using a simple model of turbulence a simulation is made of the interaction of an ensemble of discrete solid or liquid particles and a fluid continuum. Two notional one - dimensional systems are considered: one of which is unbounded and the other bounded by perfectly absorbing walls. The results for the unbounded system indicate that at sufficiently long times discrete particles may disperse more rapidly than the elements of the fluid continuum. The study on the bounded system, however, shows that in practice the ratio of particle relaxation time to particle mean residence time may be such that this rapid dispersion will not be achieved and, moreover, that characterization of the dispersion process by a constant diffusion coefficient leads to significant errors.

Water uptake by substituted amylose tablets: experimentation and numerical simulation

2009 ◽  
Vol 00 (00) ◽  
pp. 090904073309027-8
Author(s):  
H.W. Wang ◽  
S. Kyriacos ◽  
L. Cartilier
Keyword(s):  
Numerical Simulation ◽  
Water Uptake
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