scholarly journals Numerical simulation of the effect of diluents on NOx formation in methane and methyl formate fuels in counter flow diffusion flame

2020 ◽  
Vol 7 (2) ◽  
pp. 140-152
Author(s):  
Patrick Wanjiru ◽  
◽  
Nancy Karuri ◽  
Paul Wanyeki ◽  
Paul Kioni ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Diffusion Flame ◽  
Methyl Formate ◽  
Counter Flow

Sodium-Water Reaction Elucidation With Counter-Flow Diffusion Flame Experiment and Its Numerical Simulation

2010 ◽  
Author(s):  
Akira Yamaguchi ◽  
Takashi Takata ◽  
Hiroyuki Ohshima ◽  
Joji Sogabe ◽  
Yoshihiro Deguchi ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Diffusion Flame ◽  
Exothermic Reaction ◽  
Reaction Model ◽  
Liquid Sodium ◽  
Counter Flow ◽  
Pressurized Water ◽  
Sodium Fast Reactor ◽  
Transfer Tube ◽  
Design Basis Accident

Sodium-water reaction (SWR) is a design basis accident of a Sodium Fast Reactor (SFR). A breach of the heat transfer tube in a steam generator (SG) results in contact of liquid sodium with water. Typical phenomenon is that the pressurized water blows off, vaporizes and mixes with the liquid sodium. The consequence of the accident are: thermal-hydraulic and chemical impact on the heat transport equipment and structure induced by the heat of exothermic reaction and caustic reaction product. The purpose of the present paper is to delineate the mechanism and process of the SWR by a counter-flow diffusion flame experiment and a numerical simulation. Based on the numerical simulation, the most appropriate and optimum condition in which stable and continuous diffusion flame of sodium and water vapor is obtained. Key idea is to perform the experiment in a depressurized reaction vessel. According to the experiment, spatial distributions of chemical reactants and products, temperature and particles are measured in detail. The characteristics of the SWR are explained from the present study and the chemical reaction model currently used in the analytical tool of the SWR is appropriate.

Numerical Prediction and Optimization of Depressurized Sodium-Water Reaction Experiment With Counter-Flow Diffusion Flame

2008 ◽  
Author(s):  
Akira Yamaguchi ◽  
Takashi Takata ◽  
Hiroyuki Ohshima ◽  
Yoshitaka Kohara
Keyword(s):  
Diffusion Flame ◽  
Liquid Sodium ◽  
Counter Flow ◽  
Pressurized Water ◽  
Sodium Fast Reactor ◽  
Transfer Tube ◽  
Reaction Region ◽  
Long Time ◽  
Design Basis Accident ◽  
Physical And Chemical

Sodium-water reaction (SWR) is a design basis accident of a Sodium Fast Reactor (SFR). A breach of the heat transfer tube in a steam generator (SG) results in contact of liquid sodium with water. Typical phenomenon is that the pressurized water blows off, vaporizes and mixes with the liquid sodium. In this paper, a new computer program has been developed and the SWR in a counter-flow diffusion flame is studied by a numerical simulations and an experiment. The experiment is designed with the numerical simulation so that the stable reaction flame is maintained for long time and physical and chemical quantities are measured. From the comparison of analysis and experiment, there exist discrepancies that may be caused by the assumptions of chemical reaction. Hence, a new experiment is proposed to enhance the measurement accuracy and to investigate the reason of the disagreement. The authors propose a depressurized experiment. With the depressurization, it is expected the flame location can be controlled and the reaction region becomes thicker because of decrease in reactant gas density.

Numerical Simulation of Turbulent Diffusion Flame in Cross Flow

1998 ◽  
Vol 140 (1-6) ◽  
pp. 93-122 ◽  
Author(s):  
D. MORVAN ◽  
B. PORTERIE ◽  
M. LARINI ◽  
J. C. LORAUD
Keyword(s):  
Numerical Simulation ◽  
Diffusion Flame ◽  
Turbulent Diffusion ◽  
Cross Flow ◽  
Turbulent Diffusion Flame
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