抄録
In order to minute the micro-bubble diameter under low supplied pressure of 0.1MPa, the characteristics of the swirl-type micro-bubble generation device were investigated by changing swirl chamber length. The performance of the micro bubble generation device was evaluated by the bubble diameter measured by the image measurement method. Moreover the behavior of micro-bubbles was visualized by high speed camera, the flow velocity distribution around exit of micro-bubble generator was measured, and numerical analysis of the flow in the micro-bubble generator was conducted by using LES. It was clarified that the micro-bubble diameter became minuter in the shorter length of swirl chamber, and that the increase of shear stress in the surface of micro-bubble generator caused the decrease of micro-bubble diameter in radial flow out type.
