Flow properties ofHe3moving throughHe4II at temperatures below 150 mK

Measurements were performed at temperatures below 150 mK concerning the flow properties of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ moving through ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ in tubes, while the ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ component is macroscopically at rest. Empirical relations have been found for the distributions of the pressure, flow-rate density, concentration, and temperature in the tubes, as functions of the external conditions.