Investigation on Characteristics of Experiment About Single-Beam Measurements of Supercritical Fluid

An experiment has recently been completed at Xi’an Jiaotong University (XJTU) to obtain thermo-physical characteristics of supercritical pressure water at supercritical pressures with upward flow of water inside a vertically-upward bare tube. The thermo-physical characteristics of supercritical pressure water were investigated experimentally by means of a non-intrusive measurement method, using a single-beam gamma densitometer generated from the radioactive sources (Cs-137). The purpose of this experiment is to investigate accurately the changes drastic thermo-physical characteristics process of supercritical pressure water at pseudocritical point, comparing and analyzing in-depth the experiment results at different pressures and mass fluxes. Several factors influencing the performance of the gamma densitometer are examined, including the distance between the source and the detector, the distance between the source and the test section, the measuring time, the intensity of source, and the ambient temperature.