PURPOSE: To reduce energy loss on transfer of a bubble-water mixed fluid to a jetting port and to save a space of a flow passage of the bubble-water mixed fluid corresponding to the shape of the jetting port.
CONSTITUTION: A device is provided with a flow passage structure 10 for transferring a bubble-water mixed fluid, and a slit-shaped fluid jetting port 3 arranged connected to the fluid passage structure 10 and for jetting the bubble-water mixed fluid. The flow passage structure 10 has a fluid transfer pipe 11 having a circular flow passage section, a pyramid part 12 connected to the tip of the fluid transfer pipe 11 with the shape of the flow passage section being changed from a circle to a rectangle, and an enlarged part 13 connected to the pyramid part 12 with the shape of the flow passage being gradually changed from a rectangle to a slit.
OI TADASHI
TAKAHASHI YOSHIAKI
WATANABE OSAMU
MITSUTAKE HIDEO
MARUYAMA SHOICHI
ISHIKAWAJIMA HARIMA HEAVY IND