scholarly journals Numerical simulation of toxic gas diffusion in confined space

2020 ◽  
Vol 450 ◽  
pp. 012096
Author(s):  
Yicen Yue
Keyword(s):  
Numerical Simulation ◽  
Gas Diffusion ◽  
Confined Space ◽  
Toxic Gas

Numerical Simulation of Diffusion of UDMH in Confined Space

2013 ◽  
Vol 295-298 ◽  
pp. 586-589
Author(s):  
Jia Zhao Chen ◽  
Chao Ning ◽  
Yu Xiang Zhang
Keyword(s):  
Numerical Simulation ◽  
Concentration Distribution ◽  
Geometric Model ◽  
Polluted Area ◽  
Confined Space ◽  
Gas Concentration ◽  
Diffusion Pattern ◽  
Toxic Gas ◽  
3D Geometric Model ◽  
And Diffusion

In order to study the diffusion pattern of Unsymmetrical Dimethyl Hydrazine (UDMH) in a confined space, a 3D geometric model of cylindrical space with a column obstacle in the center was built and diffusion of UDMH in the space was simulated by using FLUENT. The gas concentration distribution in the space was gained at different moments, and the polluted area with concentration above 0.5ppm was focused on. The simulation result suggests that the toxic gas is mainly concentrated in an area about 1m above the bottom of the space, and ventilation can effectively reduce the hazard time and continuous expansion of polluted area.

Numerical simulation of wood crib fire behavior in a confined space using cone calorimeter data

2014 ◽  
Vol 119 (3) ◽  
pp. 2291-2303 ◽  
Author(s):  
Shaogang Zhang ◽  
Xiaomin Ni ◽  
Mei Zhao ◽  
Junjie Feng ◽  
Ruifang Zhang
Keyword(s):  
Numerical Simulation ◽  
Cone Calorimeter ◽  
Fire Behavior ◽  
Confined Space ◽  
Wood Crib

Numerical Simulation of SOFC Performance Affected by Cathode Mesoscale-Structure Control

2008 ◽  
Author(s):  
Akio Konno ◽  
Hiroshi Iwai ◽  
Motohiro Saito ◽  
Hideo Yoshida
Keyword(s):  
Numerical Simulation ◽  
Current Density ◽  
Porous Electrode ◽  
Gas Diffusion ◽  
Porous Electrodes ◽  
Cell Performance ◽  
Structure Control ◽  
Mesoscale Structures ◽  
Mesoscale Structure ◽  
Electrolyte Interface

Increase of the current density is one of the most important topics in the development of solid oxide fuel cells. In this study we focus on the possibility of the current density enhancement by controlling the mesoscale structure of the electrodes. Modifications of the mesoscale structures increase the area of electrode-electrolyte interface and the volume of the electrode, reduce the electrolyte thickness, affect gas diffusion in the porous electrode and consequently influence the cell performance. To evaluate its effect on the cell performance, two-dimensional numerical simulation for SOFC with and without mesoscale grooves on the cathode-electrolyte interface is conducted to understand the effects of such cathode mesoscale structure on the cell performance. It is found that the electrochemical reaction in porous electrodes takes place in the region close to the electrode-electrolyte interface and the cell performance can be improved by applying cathode mesoscale structures.

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