โ Scribed by Hitoshi Soyama; Yoshiaki Yanauchi; Kazunori Sato; Toshiaki Ikohagi; Risaburo Oba; Ryoichiro Oshima
No coin nor oath required. For personal study only.
Some peculiar phenomena occur around ultrahigh-speed submerged water jets accompanied by very severe cavitation erosion. Using the flow visualization technique with a xenon flash, the water jets were carefully observed, and the spatial distributions of highly erosive impulsive pressures around the jets were measured by means of a pressure-sensitive film technique. The effects of the injection pressure and the nozzle configuration are systematically clarified. Thus, the characteristics and structures of ultrahigh-speed submerged water jets are clearly shown.
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## Abstract Flow jets containing velocities up to 5โ7 m/s are common in patients with congenital defects and patients with valvular disease (stenosis and regurgitation). The quantitation of peak velocity and flow volume in these jets is clinically significant but requires specialized imaging sequen