Methods of calculation and numerical analysis of conducting-gas flow in high-current electric arcs

1979 ◽  
Vol 13 (5) ◽  
pp. 718-724
Author(s):  
G. A. Desyatkov ◽  
A. Zh. Zhainakov ◽  
P. V. Kozlov ◽  
V. M. Lelevkin ◽  
M. A. Samsonov ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Gas Flow ◽  
High Current ◽  
Electric Arcs ◽  
Methods Of Calculation

scholarly journals Mechanisms Responsible for Arc Cooling in Different Gases in Turbulent Nozzle Flow

2017 ◽  
Vol 4 (3) ◽  
pp. 234-240 ◽  
Author(s):  
Y. Guo ◽  
H. Zhang ◽  
Y. Yao ◽  
Q. Zhang ◽  
J. D. Yan
Keyword(s):  
Material Properties ◽  
High Speed ◽  
Gas Flow ◽  
Ohmic Heating ◽  
Circuit Breaker ◽  
Fault Current ◽  
High Current ◽  
Physical Mechanisms ◽  
Current Zero ◽  
Different Gases

A high voltage gas blast circuit breaker relies on the high speed gas flow in a nozzle to remove the energy due to Ohmic heating at high current and to provide strong arc cooling during the current zero period to interrupt a fault current. The physical mechanisms that are responsible for the hugely different arc cooling capabilities of two gases (SF<sub>6</sub> and air) are studied in the present work and important gas material properties controlling the cooling strength identified.

Numerical Analysis of Multi-Layer Continuous Diffusion Furnace Door Gas Curtain

2013 ◽  
Vol 367 ◽  
pp. 462-465
Author(s):  
Sheng Cai Zhang ◽  
Gui Qin Li ◽  
Li Xin Lu ◽  
Peter Mitrouchev ◽  
Cheng Gang Wang
Keyword(s):  
Numerical Analysis ◽  
Heat Loss ◽  
Thermal Load ◽  
Gas Flow ◽  
Time Varying ◽  
Main Aspect ◽  
Temperature Zone ◽  
Furnace Temperature ◽  
Air Curtain ◽  
Reduce Heat Loss

Thermal load oozing out through the door is the main aspect of the temperature zone heat loss of continuous diffusion furnace. In this paper, multi-layer gas curtain is designed to seal the furnace door in order to reduce heat loss and ensure furnace temperature to meet requirements in regulation. The unsteady flow is presented to better reflect complex time-varying velocity and temperature of curtain gas. Flow and temperature field of continuous diffusion door with multi-layer air curtain are numerically analyzed by Renault model and experimentally tested. And the influence parameters are tuned and optimized based on the theoretic numerical analysis and experiment results.

Numerical analysis of the gas flow rate uniformity in the molten carbonate fuel cell (MCFC) under various conditions

2012 ◽  
Vol 26 (6) ◽  
pp. 1971-1978
Author(s):  
Junhyun Cho ◽  
Han-Sang Kim ◽  
Kyoungdoug Min ◽  
Jong Hoon Park ◽  
In Gab Chang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Numerical Analysis ◽  
Flow Rate ◽  
Gas Flow ◽  
Molten Carbonate Fuel Cell ◽  
Molten Carbonate ◽  
Gas Flow Rate ◽  
Carbonate Fuel Cell

Orientation-Dependent Performance of Portable Proton Exchange Membrane Fuel Cells

2011 ◽  
Vol 8 (3) ◽  
Author(s):  
Jen-Chieh Lee ◽  
Tony Shay ◽  
Song-Kuo Chang
Keyword(s):  
Fuel Cell ◽  
Gas Flow ◽  
Proton Exchange Membrane ◽  
Produced Water ◽  
High Current Density ◽  
Vertical Direction ◽  
Flow Channel ◽  
Proton Exchange ◽  
High Current ◽  
Channel Distribution

The effects of gravitational force on the orientation-dependent performance of portable proton exchange membrane (PEM) fuel cell using serpentine flow channels were investigated by the measurement and analysis of polarization curves. Whether the removal of produced water in the cathode flow channel is resisted or assisted by the gravity depends on the orientation variation, flow direction, and flow channel distribution of a fuel cell. This gravity will then affect the fuel cell performance, especially for fuel cells operating at a high current density. The results show that a fuel cell with perpendicular flow channel distribution and cathode gas flow in vertical direction requires a longer distance of pushing liquid droplets against gravity to remove the produced water, which is difficult to expel the produced water from the flow channels, and the performance reduction is obviously in high current density. A fuel cell operating in a normal position achieves higher performance than one operating in a horizontal position, except the cathode gas flow in vertical direction and feed from lower inlet. Furthermore, for a fuel cell operating in a horizontal position with anode below the membrane, gravitational force transports the water to the anode and blocks the fuel channel in the gas diffusion layer. This leads a fuel cell operating in high current densities with the cathode below the membrane performs better than one with the cathode above the membrane. Therefore, to reduce the effects of gravity on the orientation-dependent performance, a fuel cell with parallel flow channel distribution and feeding the cathode gas from the upper inlet port is recommended in this study.

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