Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 29, 2018 - November 30, 2018
It is sometimes required to control bubble generation in still liquid in order to investigate the flow contains bubbles. One of the methods is to use acoustic pressure wave and a slit elastic tube. In this study, we investigated the effect of aqueous surfactant for this bubble generation method. Especially we focused on the effects of the adsorption of surfactant to gas-liquid interface, i.e. dynamic surface tension. As a result, there were differences of generated bubble size by changing the kind and concentration of surfactants. This indicate that the surface tension change in milliseconds time scale is affected to the bubble generation. In addition, the shape oscillation of generated bubble was suppressed, and the bubble was adhered to the elastic tube. This result supports a hypothesis of our proposed bubble generation mechanism.
