Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 08, 2021 - November 10, 2021
It is well known that fine bubbles have excellent washing properties. Although this property has been applied to a variety of products and technologies, the mechanism has not been clarified. To clarify it, we conducted a washing experiment using a solution containing microbubbles. The size of the bubbles was 100 nm in average particle diameter. an ultrasonic washer was used for washing. The washing target was beef tallow, which is an oily dirt. To compare the amount of dirt before and after washing, fluorescent particles were mixed into the beef tallow. By irradiating the dirt with UV light, the amount of contamination can be evaluated. The results before and after washing were compared, as well as the size and number density of the bubbles. The experimental results showed that the solution containing fine bubbles had better washing performance than purified water. This improvement was noticeable in the early stages of cleaning.
