A numerical study on smoke layering plugholing under mechanical extraction in a long channel

In a long model channel under mechanical extraction, the flow pattern, vertical temperature distribution and depth of the smoke layer below the extraction vent were analyzed by numerical modeling. The variations of the depth and temperature under different mechanical extraction rates were quantitatively described. The results show that plugholing occurs in the long channel when smoke extraction rate increases to some relative high levels, causing the efficiency of the mechanical extraction system to be reduced.