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- W2349370692 abstract "The present paper takes its target to simulate the gas distribution in sloping heading face with forced auxiliary ventilation by using a market-available software named Fluent.Our simulation results can be compared between the upward and downward heading faces with the forced auxiliary ventilation going on.In proceeding with our research,we have analyzed the influence of ventilation airflow quantity on the methane distribution.Since the airflow quantity is needed to guarantee the.elimination of the.methane collection in the upward and downward heading faces,detailed analysis should be done of the average methane concentration in the mining faces.The results of our analysis indicate that under the same condition,when the average exporting velocity of the duct,the angle of inclination and the gas emission amount in face should be made in correspondence with each other.If the average methane concentration in return airflow is lower,there should exist a range of high-concentration methane area in the sloping face.The problem is actually caused by the gas buoyancy.However,when the gas is filled in the upward heading face,there would appear accumulation of the gas at the top of the heading face,which makes the gas difficult to be eliminated. Thus,the zone with high-concentrated gas would be larger in the downward face due to the convection.In such a situation,the airflow and the gas flow would be fully mixed and make the high concentration gas zone smaller than that in the upward face.However,the difference in the zone with high concentrated methane is likely to gel smaller with the increase of the air quantity and methane emission rate,if the average methane concentration in the return airflow is the same with the exporting airflow,which is caused by the increase of the airflow in the upward face and the mixture of air and gas there turns to be more evenly.However,when the zone with high concentrated methane in upward heading face remains larger than that in downward face,the angle of inclination and the gas emission in sloping heading face would also remain the same.And,in turn,the airflow quantity needed to eliminate the methane collection should be much bigger at the upward face than at the downward face." @default.
- W2349370692 created "2016-06-24" @default.
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- W2349370692 date "2011-01-01" @default.
- W2349370692 modified "2023-09-25" @default.
- W2349370692 title "Probing the regularity of the gas distribution in a sloping head-face on the background of forced auxiliary ventilation" @default.
- W2349370692 hasPublicationYear "2011" @default.
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