This paper d a study performed to obtain the heat transfer charescribesacteristics of liquid helium-I in a vertical tube under forced convection conditions. The test section was a stainless steel tube of 0.109cm ID and 8.5cm length. The helium pressure ranged from 1.1 to 1.9atm (0.11 to 0.19MN/m2) and the quality (mass vapor fraction) ranged from zero to 1. Results were correlated using the conventional equations and compared with the data in literatures. The hysteresis observed in the nucleate boiling region was qualitatively discussed. The quality dependence of two-phase flow heat transfer was clearly observed during the increase, but not during the decrease, of heat flux or quality.
It has been known since systematic study by Berman et al that dilute alloy of Au containing small amount of Fe is an excellent material for low-temperature thermocouples, but so far there was no Au(Fe) wires made in Japan commercially. Recently Osaka Oxygen Ind. Ltd. has developed Au+0.07at%Fe wires. This paper describes the tested results on Au(Fe)-Chromel and Au(Fe)-Cu thermocouples from room temperature down to 1.5K. Temperature variation of thermoelectric power and sensitivity, influence of magnetic field on the thermoelectric power, reproducibility and difference among thermoelectric powers of several specimens are examined. And also temperature variation of electrical resistivity of an Au(Fe) wire is determined to calculate its thermal conductivity.