F343 衝撃圧縮によって誘起された He II 中における圧縮衝撃波の伝播

概要

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The propagation of a compression shock wave in superfluid helium (He II) was experimentally investigated by using the superfluid shock tube facility. A shock wave is generated in He II by the impingement of a gas dynamic shock wave onto vapor-He II interface. In fact, upon the impingement two modes of shock waves, a compression and a thermal shock waves, are induced in He II. Here, we are only interested in the former. One of our research target is the shock-compressed phase transition (He II to He I). The λ-phase transition is successfully caused in such a very rapid process as shock wave compression. The shock wave propagation properties are measured by piezo-type pressure transducers and in-house-made superconductive temperature sensors. Schlieren visualization method is also adopted with an ultra-high-speed video recorder (40,500 pictures/s).
日本流体力学会の論文
2001-07-31