<；P>；PROBLEM TO BE SOLVED: To make a loop current type bubble generation nozzle capable of generating bubbles with an average diameter smaller than 100 &mu；m, particularly, microbubbles with an average diameter around 20 &mu；m and having a more simple and compact configuration than a conventional one. <；P>；SOLUTION: A liquid is supplied via a liquid supply hole 3a from one end side and a gas is supplied via a gas supply chamber 4 from the other end side to a loop current type gas-liquid stirring and mixing chamber 5. Herein, while being swirled on a center axis of the liquid supply hole 3a in the gas supply chamber 4, the gas flowing in through a gas flow-in hole 2a is supplied toward one end side of the loop current type gas-liquid stirring and mixing chamber 5 from the entire or a part of the circumference to the loop current type gas-liquid stirring and mixing chamber 5. In the loop current type gas-liquid stirring and mixing chamber 5, the liquid and the gas are stirred and mixed by the loop-like current to be a mixed fluid and jetted through a jetting hole 1a. <；P>；COPYRIGHT: (C)2009,JPO&INPIT
