Flash-impinging stream drying

The term impinging stream dryer (ISD) refers to a class of flash dryers in which moisture evaporation from wet particles or liquid droplets occurs in the impingement zone that develops as a result of the collision of two oppositely directed high-velocity gas streams, at least one of which contains the dispersed material to be dried. At the outset a distinction should be made from the impingement dryers in which gas jets are directed onto the web, sheet-form, or slablike materials (Mujumdar and Huang, 1995) or the jet-zone dryer in which a layer of particulates is pseudo-fluidized by a multiplicity of high-velocity airstreams exiting a number of perpendicularly oriented air nozzles (Kudra and Mujumdar, 1995). 

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