Recently, metal fiber materials with the diameter of about 30 to 300 μm are of considerable industrial interest, because these metal fiber materials are estimated to be anisotropic thermal conductivity from the various investigations of non metal fiber materials (insulating ceramic fiber materials etc. ). However, there are few experimental data on the thermal conductivity of the Aluminum fiber materials. The purpose of this study is to investigate the anisotropic thermal conductivity of some metal fiber materials (Aluminum, Zinc and Nickel fiber) experimentally and theoretically. And it is found that the anisotropic thermal conductivity of the metal fiber materials depend on the density or porosity, Young's modulus, fiber length and fiber diameter.
In this paper, the influence of universal buffer on diffusion phenomena of protein was studied. We have developed short-time yet precise observation system of mass diffusion phenomena of protein. The system can produce spatially clear and high resolution concentration distribution image compared with conventional interferometer. In order to investigate the influence of pH value of the buffer on diffusion phenomena, several pH values of universal buffer solution were used. Also, to investigate the concentration dependency of pseudo mass diffusion coefficient, solutions over a wide range of concentration were prepared. The experiments were carried out under isothermal condition, and available data were found. The dependency of pH value of surrounding buffer and that of concentration on diffusion phenomena were discussed.
Accurate knowledge of hydrogen gas viscosity is extremely important for developing a hydrogen economy. There is a need for recommendations relating to the best available viscosity data and the best available correlations for practical purposes. The purpose of this work is to analyze the various possibilities for viscosity correlation to estimate hydrogen gas viscosity in the high pressure and high temperature region for practical industrial uses. We recommend suitable force constants and a collision integral for the Chapman-Enskog solution to estimate viscosity in the limit of zero density. At high density, modification of Diller's extrapolation equation for excess viscosity gives good agreement with the available experimental data. A combination of the Chapman-Enskog solution and modification of Diller's excess viscosity gives an estimation of hydrogen gas viscosity within 2 to 4% deviation from the existing experimental data for the high-temperature and high-pressure region.
A PVT property measurement apparatus based on the Burnett method has been developed for high pressure hydrogen up to 100 MPa in the range from room temperature to 523K with safety and efficiency in mind, the apparatus was designed for remote operation and computerized data acquisition. PVT property measurements for nitrogen have been performed up to 100 MPa at 353K and they were in good agreement with an existing equation of state(EOS) within ±0.22%. We have finally succeeded in measuring the PVT property of hydrogen up to 100 MPa at 353 K. For these pressure and temperature ranges, the existing EOS for hydrogen is applicable with reasonable accuracy.