Abstract
AbstractThe formation of fine bubbles with a diameter between 10 and 20 μm was observed upon the passage of air‐supersaturated water, in which air is pressurized and dissolved, through a water passage in which supersonic stimulation was given to the water. It was confirmed that the inside diameter of the fine bubbles increases as the distance from the ultrasonic stimulation point becomes greater. In verifying the efficiency of cleaning a lipstick stain, it was shown that by using water containing fine bubbles, there is a possibility of obtaining a cleaning efficiency almost equivalent to that achieved by cleaning with water of a high temperature or with a high concentration of detergent, even at a low temperature, with low detergent concentration. It was shown that the efficiency of cleaning the oil components, which were made easily soluble in water, had become extremely high, when using water containing fine bubbles. In conditions where the melting of the oil component itself is not accelerated (that is, at a low temperature, without using detergents), the cleaning efficiency of water containing fine bubbles tended to be increased compared with that of water not containing fine bubbles.
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