高圧水素の熱物性測定

抄録

Studies on hydrogen thermophysical properties at high pressure have been performed. The properties being measured are the PVT relation, viscosity, thermal conductivity, solubility in water and others. The present paper introduces the measurement systems especially equipped for high pressures and some results are shown. The Burnett method was used to measure the PVT relation in the range up to 100 MPa and up to 473 K. The obtained PVT data agree well with the existing EOS in the low pressure range, while for the density at 100 MPa and 473 K the EOS deviates by 0.7% from the measurements. The capillary method was used to measure viscosity and the measured results below 8 MPa roughly agree with those predicted by Chapman-Enskog theory. The transient short-hot wire (TSHW) method was adopted for measuring thermal conductivity and thermal diffusivity. By coupling with a numerical analysis, it was found that the TSHW method can effectively be applied to the measurement of hydrogen thermal conductivity. The measured thermal conductivity showed fairly good agreement with the literature within±1% at pressure range less than 0.3 MPa. A measurement system for the solubility ofhydrogen in water was developed and the results at 298 K and below 29 MPa agree well with previously reported data.