This paper reports on the available experimental and analytical studies on a relatively novel flash drying configuration involving use of jets impinging against each other. The impingement zone provides ideal conditions for highly enhanced heat and mass transfer from particles or droplets to the gas stream. Repeated particle penetration into the opposite jet stream allows longer residence times in the impingement zone to accomplish desired drying. The collisions of the particles also permit breakage of lumps and better drying even for poly disperse materials. Advantages and limitations of this concept are discussed along with a discussion of some industrial applications