2021 年 19 巻 2 号 p. 217-223
A precise prediction of the cryogenic fluid system is not an easy task especially at relatively smaller mass flow rates, because the heat input to the working fluid from the surroundings becomes significant. We conducted a series of flow tests with liquid oxygen to measure temperature, density, and the pressure loss characteristics at a flow rate of 100-200 g/s, and we compared them to the prediction. The heat input to the working fluid obtained from the experiment was about 14-18 kJ/kg. Also, the heat transfer coefficient through the insulated tube wall was calculated from the experiment. The temperature rise along the feedline was well explained with K = 0.28-0.79 W/m-K whereas the theoretical model gives K = 0.044 W/m-K.
