Patent ID: 7727054

Claim:
A nozzle assembly comprising: a) a plenum chamber; and b) at least one coherent jet nozzle disposed at a downstream end of said plenum chamber, wherein the at least one coherent jet nozzle comprises: a proximal end portion having a downstream axis and a largest transverse dimension D, measured at a non-contracting base of the at least one coherent jet nozzle, and a distal end portion; the distal end portion decreasing in transverse dimension in the downstream direction, having a surface disposed at an angle of at least about 30 degrees relative to the axis, and terminating at an outlet having a longitudinal cross-sectional dimension d; wherein D:d is at least about 2:1; and the plenum chamber has a smallest transverse dimension that is greater than the largest transverse dimension D of said proximal end portion.