Abstract
Two modes of shock waves propagating in He II, that is, a compression and a thermal shock waves, were investigated by a measurement of temperature and pressure with superconductive temperature sensors and pressure transducers and by visualization. We adopted the experimental method in which a gas dynamic shock wave impinged onto a He II-free surface by a newly developed superfluid shock tube facility. It was found that the temperature sharply drops as a result of compression by a compression shock wave. However, the temperature drop turns to a rise when the phase of liquid helium changes from He II to He I by shock compression. It was also found that in the immediate vicinity of the vapor-He II interface, no thermal shock wave is excited, where a thermal boundary layer with a large temperature gradient in which the physical state changes from supercritical helium to He II via He I is formed with a thickness of several mm. The temperature profile of a thermal shock wave was found to be a single triangular waveform similar to that of a thermal shock wave generated by large heat flux by a planar heater with a long heating time.
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Schedule a callMore From: TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
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