Abstract
In order to reduce the amount of chemical solvent used in the washing process, the non-chemical washing technology with micro-bubble is required. In the present study, we focus on the micro-bubble generator with a venturi tube. To clarify washing effect by the micro-bubble generator, washing experiment with cutting oil, grease and oil paint are conducted. As a result, the generations of micro-bubbles from bubble collapses were observed in the venturi tube through a high speed video camera. Additionally, the relation between the oil detachment rate and the flow structure and pressure on the washing surface proposed that the pressure wave and micro-bubble caused by the bubble breakup were the advantage of this washing technology.
