naa a22 4500 510765882 CHVBK 20180411083156.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s11630-013-0614-1 doi (NATIONALLICENCE)springer-10.1007/s11630-013-0614-1 Generating and focusing of underwater expansion wave using a silicon resin reflector [Elektronische Daten] [Takafumi Nakabaru, Tokitada Hashimoto, Shigeru Matsuo, Toshiaki Setoguchi, G. Rajesh] In the present study, an ellipsoid reflector was designed and produced using silicon resin in order to generate and focus expansion wave in water for the purpose of a medical application. Across an expansion wave the static pressure, temperature and density decrease, as a result, negative pressure is given behind the expansion wave generated in the water, and then a tensile stress is induced. As an acoustic impedance of the silicon resin is almost similar to that of water, the interface of air-silicon resin would be regarded as the same with that of the air-water. A high voltage discharge was used as an energy source of underwater shock wave. When the underwater shock wave reflects on this interface, it is already clear that the shock wave converts to the expansion wave. The generation and focusing of the expansion wave were carried out and the phenomena were observed by flow visualization using a high-speed camera. Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg, 2013 medical application nationallicence under water expansion wave nationallicence focusing technique nationallicence acoustic impedance nationallicence E : ellipticity nationallicence I acou : acoustic impedance (kg/s*m2) nationallicence L 1 : length of the minor axis (mm) nationallicence L 2 : length of half of the major axis (mm) nationallicence L f : distance from the top to the focal point (mm) nationallicence p : pressure (MPa) nationallicence X : distance from the origin to the electrode gap (mm) nationallicence Nakabaru Takafumi Graduate School of Science and Engineering, Saga University, 1, Honjo-machi, Saga-shi, 840-8502, Saga, Japan aut Hashimoto Tokitada Department of Advanced Technology Fusion, Graduate School of Science and Engineering, Saga University, 1, Honjo-machi, 840-8502, Saga-city, Saga, Japan aut Matsuo Shigeru Department of Advanced Technology Fusion, Graduate School of Science and Engineering, Saga University, 1, Honjo-machi, 840-8502, Saga-city, Saga, Japan aut Setoguchi Toshiaki Institute of Ocean Energy, Saga University, 1, Honjo-machi, 840-8502, Saga-city, Saga, Japan aut Rajesh G. Keimyung University, Keimyung, Korea aut Journal of Thermal Science SP Science Press 22/3(2013-06-01), 209-215 1003-2169 22:3<209 2013 22 11630 https://doi.org/10.1007/s11630-013-0614-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11630-013-0614-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nakabaru Takafumi Graduate School of Science and Engineering, Saga University, 1, Honjo-machi, Saga-shi, 840-8502, Saga, Japan aut NATIONALLICENCE 700 1- Hashimoto Tokitada Department of Advanced Technology Fusion, Graduate School of Science and Engineering, Saga University, 1, Honjo-machi, 840-8502, Saga-city, Saga, Japan aut NATIONALLICENCE 700 1- Matsuo Shigeru Department of Advanced Technology Fusion, Graduate School of Science and Engineering, Saga University, 1, Honjo-machi, 840-8502, Saga-city, Saga, Japan aut NATIONALLICENCE 700 1- Setoguchi Toshiaki Institute of Ocean Energy, Saga University, 1, Honjo-machi, 840-8502, Saga-city, Saga, Japan aut NATIONALLICENCE 700 1- Rajesh G. Keimyung University, Keimyung, Korea aut NATIONALLICENCE 773 0- Journal of Thermal Science SP Science Press 22/3(2013-06-01), 209-215 1003-2169 22:3<209 2013 22 11630 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer