日本語フィールド
著者：Takafumi Nakabaru, Tokitada Hashimoto, Shigeru Matsuo, Toshiaki Setoguchi, G. Rajesh題名：Generating and Focusing of Underwater Expansion Wave using a Silicon Resin Reflector発表情報：Journal of Thermal Scinece 巻: 22 号: 3 ページ: 209-215キーワード：
medical application, under water expansion wave, focusing technique, acoustic impedance概要：抄録：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 regin 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.英語フィールド
Author：Takafumi Nakabaru, Tokitada Hashimoto, Shigeru Matsuo, Toshiaki Setoguchi, G. RajeshTitle：Generating and Focusing of Underwater Expansion Wave using a Silicon Resin ReflectorAnnouncement information:Journal of Thermal Scinece Vol: 22 Issue: 3 Page: 209-215Keyword：
medical application, under water expansion wave, focusing technique, acoustic impedanceAn abstract：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 regin 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.