Plural odd number bell-like openings nozzle device for a fluidized bed jet mill

• Main Authors: Casalmir, D. Paul, Kumar, Samir, Higuchi, Fumii
• Format: Patent
• Language: English
• Published: 13.09.2005

A jet mill includes plural nozzle devices for discharging a composite stream of high velocity fluid. Each nozzle device includes a plural odd number of nozzle openings for discharging an individual stream of high velocity fluid. Each nozzle opening comprises (i) a converging region for converging and accelerating a volume of high pressure fluid; (ii) a throat region defining a narrowest diameter region of the nozzle opening; (iii) a first expansion region for producing a linear expansion of the volume of high pressure fluid, and (iv) a second expansion region for producing a turning expansion as well as a parallel flow of the volume of high pressure fluid. The first expansion region has a radius "r" and a length "s" with radius rand length sdetermined such that (dr/ds) is a constant. The second expansion region has a radius "r" and a length "s" with radius rand length sdetermined such that (dr/ds) is non-linear and a function of s