PROBLEM TO BE SOLVED: To provide a fine bubble generator which makes it possible to efficiently generate an air bubble having a particle size of a micrometer order.SOLUTION: A fine bubble generator 1, which applies rotation force to a gas-liquid mixed fluid and refines an air bubble by shear force, is configured from a first cylindrical closed vessel, a second cylindrical opened vessel having a space in which a gas-liquid mixed fluid is rotatable. In the generator 1, the second cylindrical opened vessel is equipped with: an introduction port 9 which introduces the gas-liquid mixed fluid along a tangential direction of an inside surface of the first cylindrical closed vessel, a gas-liquid introduction port 9 equipped with an ejector introduction port 6, a bottom surface wall 3 which is orthogonal to a face on which the ejector port 6 of the first cylindrical closed vessel is arranged, a ceiling wall 5 which faces the bottom surface wall and is positioned near the introduction port 9, and a gas-liquid discharge port 15 which is positioned on a center axis of the second cylindrical opened vessel and which penetrates the ceiling wall 5.COPYRIGHT: (C)2015,JPO&INPIT【課題】粒径がマイクロメートルオーダーの気泡を効率的に発生させることを可能とする微細気泡発生器を提供する。【解決手段】円筒形の第一の円筒状密閉容器と、気液混合流体の旋回可能な空間を有する円筒形第二の円筒状開放容器と、第一の円筒状密閉容器の内側面の接線方向に沿って気液混合流体を導入する導入口9と、エジェクター導入口6を備えた気液導入口9と、第一の円筒状密閉容器のエジェクター導入口6が配設された面と直交する底面壁3と、その壁面と対向し、導入口9の近くに位置する天井壁5と、円筒形第二の円筒状開放容器の中心軸線に位置し、天井壁5を貫通した気液吐出口15を備えた第二の円筒状開放容器により構成され、気液混合流体に旋回力を加え、剪断力により気泡を微細化する微細気泡発生器1。【選択図】図1A
