A laser flash apparatus has been developed for thermal diffusivity measurements of solid materials in the range from 1600K to 2500K. The difference of the thermal diffusivity of POCO AXM-5Q1 graphite(NIST RM 8424)between the value measured with this apparatus and the reference value measured with a high-temperature laser flash apparatus in NIST is smaller than 1%. Thermal diffusivities of glassy carbon and two-dimensional carbon/carbon composite measured with this apparatusfrom 1600K to 2500K are consistent with smooth extrapolation from the results of the same specimens measured with a standard laser flash apparatus in NRLM from the room temperature to 1800K.
ln the present study, partial molar volumes of methanol at 313.15K and ethanol at 308.15K at infinite dilution in supercritical carbon dioxide were measured between 7MPa and 10MPa. Partial molar volumes of alcohol at infinite dilution were evaluated with the molar volume of pure carbon dioxide and the one of the homogeneous fluid made of carbon dioxide and a small amount of alcohol at the same temperature and pressure. The experimental data obtained were correlated with the Soave-Redlich-Kwong equation of state.
The applicability of the solution for unsteady heat conduction to the convenient approximation of heating time for pan frying was studied on ground chicken, egg white gel and pancake batter. The thermal conductivities of samples were predicted by Choi and Okos's model. For ground chicken and egg white gel, a close approximation to the measured value was given by adding the water evaporation time to the solution for heat conduction with the thermal property values at the initial temperature. The differences between the measured times and the approximate values were within -4.0±7.1%. For pancake batter as puffed food, a certain degree of approximation was obtained using the volume fraction of bubble of expanded pancake and the thermal property values at the mean temperature. The thermal conductivity of pancake was estimated by Sakiyama and Yano's model included latent heat transport accompanied by the water vapor diffusion.
ln order to design thermally desirable pillows, we must quantitatively evaluate the heat, moisture and air transport properties of the padding materials. ln this study, we measured the effective thermal conductivity, air resistance and heat transfer property combined with moisture transfer for some fibrous materials such as polyester and wool, feather, buckwheat chaff, some types of polyethylene pipe and hollow bead, gravel, red beans, etc. These measurements clarified the range of the values for these properties and the characteristics of each type of padding, for example, we found that fibrous materials had smaller values for effective thermal conductivity and larger values for air resistance, while hollow beads had smaller values for air resistance. The relation between these properties and the shape and composition of the padding, and its air spaces were discussed from the viewpoint of the design of the padding materials.
The assessment of the uncertainty in realizing the freezing point of aluminum, which is one of the temperature fixed points defined in the ITS-90, is presented. The type A uncertainty was obtained from the repeated measurements and the type B uncertainty was estimated from various corrections such as those for self-heating of the thermometer, surroundings pressure, hydrostatic pressure effect, surroundings temperature, temperature distribution in the cell, and impurity effect of the metal. The combination of those two types of uncertainty gives a combined standard uncertainty of 0.44mK.