Flooding (‘‘flushing’’) of powder through a small orifice by an external load

摘要: Loosely packed cohesive powders, through which air is difficult to permeate, can be caused flow small orifices if the interstitial pressure increased by an external load. We call this phenomenon ‘‘flushing.’’ Noncohesive free‐flowing granular materials do not give phenomenon. The experimental apparatus consisted of a cylindrical vessel having side orifice near bottom, and piston that presses powder given initial voidage in with constant Threshold conditions are required rise flushing, these defined pressure. efflux rate from depends on voidage, density, mean size particles, load, diameter, but independent head.