BUBBLE GENERATING NOZZLE, AND LOOP FLOW TYPE BUBBLE GENERATING NOZZLE

PROBLEM TO BE SOLVED: To provide a bubble generating nozzle and a loop flow type bubble generating nozzle, capable of improving generation efficiency of bubbles, and capable of enhancing generation of bubbles than before, with a simple configuration.SOLUTION: A bubble generating nozzle 10 includes an agitating-mixing chamber 8: having on one end an inflow hole 8a capable of making liquid and gas flow in; having on the another end a jetting hole 8b provided so that a mixed fluid can be jetted; and continuously expanding its diameter toward the jetting hole 8b from the inflow hole 8a. The bubble generating nozzle 10 also includes: a first liquid supply hole 5 continuously reducing its diameter toward the another end from one end; a second liquid supply hole 6 extending toward the one end side of the agitating-mixing chamber 8 from the another end of the first liquid supply hole 5; one or more of gas inflow holes 4 for making the gas flow in; and a gas supply chamber 3 provided on the one end side of the agitating-mixing chamber 8 and supplying the gas flowed in from the gas inflow hole 4 to the agitating-mixing chamber 8 toward the one end side of the agitating-mixing chamber 8 from a place of the whole or a part of the periphery, while revolving around the central axis of the first and second liquid supply holes 5 and 6.