한국초전도저온공학회:학술대회논문집 (Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference)
- 한국초전도저온공학회 2002년도 학술대회 논문집
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- Pages.23-26
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- 2002
기체역학적 충격파의 입사에 의해 유도된 초유동헬륨중의 충격파
Shock Waves in He II induced by a Gas Dynamic Shock Wave Impingement
- 양형석 (홍익대학교 부설 과학기술연구소) ;
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- H. Nagai ;
- Y. Ueta (Institute of Engineering Mechanics and Systems, University of Tsukuba) ;
- K. Yanaka (Institute of Engineering Mechanics and Systems, University of Tsukuba) ;
- M. Murakami (Institute of Engineering Mechanics and Systems, University of Tsukuba)
- 발행 : 2002.02.01
초록
Two modes of shock waves propagating in He II (superfluid helium), this is a compression and a thermal shock waves, were studied experimentally by using superconductive temperature sensors, piezo pressure transducers and Schlieren visualization method with an ultra-high-speed video camera (40,500 pictures/sec). The shock waves are induced by a gas dynamic shock wave impingement upon a He II free surface. It is found that the shock Mach number of a transmitted compression shock wave is up to 1.16, and the shock Mach number of a thermal shock wave coincides well with the second sound velocity under each compressed He II state condition. The temperature rise ratio of an induced thermal shock wave to that of an incident gas dynamic shock wave was found to be very small, as small as 0.003 at 1.80K.
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