Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 07, 2019 - November 08, 2019
In recent years, research on the use of underwater expansion waves in cell engineering and medical applications has attracted attention. Expansion waves can be generated by reflection at interfaces with large acoustic impedance differences, and research on expansion wave focusing using silicon materials is seen. However, there are still many unclear points regarding the characteristics of expansion waves. In this study, we generated underwater expansion wave by underwater shock wave reflection at the water-air interface and the PDMS-air interface. And we focused underwater expansion wave by reflection from an ellipsoidal reflector made of PDMS. The results showed that a large positive pressure appears behind the negative pressure in the expansion wave focused by the PDMS reflector. Then, when the propagation of the internal waves was observed with a two-dimensional reflector, a shock wave along the focusing expansion wave was observed.
