抄録
The breakup process of a high speed liquid jet injected through a circular nozzle into air was studied by instantaneous pictures of the jet and the measurements of liquid drop fraction. The nozzles used in this experiment were a conical nozzle, a circular pipe with rough wall and one with smooth wall. It is concluded that the jet breaked up into small liquid droplets from the surface of the jet due to turbulence in a nozzle in the region of L/d<100 where L was the distance along the jet from the exit of the nozzle and d a inner diameter of a nozzle, but in L/d>100, the breakup of the jet occured after wavy fluctuation of the jet, independent of the kinds of nozzles.
