Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 12, 2022 - November 13, 2022
In the cleaning and coating processes of product manufacturing, some cases require filling liquid into closed-end holes. We have developed a liquid infiltration method, i.e., gas removal, into closed-end holes by irradiating acoustic waves. The method uses gas oscillation inside the holes; however, the final removal process of break-up gas columns is still unclear. This study observed the multiple gas column oscillation inside a closed-end hole during acoustic wave irradiation and its removal process. We also visualized the liquid flow between columns using the PIV. As a result, we found that the gas removal depends on the size and number of gas columns. The removal case of air columns approached and coalesced and then ejected. The oscillation near the gas column near the hole exit induces the flow between columns, and the other gas column also oscillates. Therefore, the smaller flow velocity cases for small and long-distance gas columns could not achieve gas removal due to liquid inertia.
