Measurement of Solid Velocity in the Vertical Pneumatic Transport of Powdery Material at a High Solid-loading Ratio : Fluids Engineering

In the pneumatic transport of PVC powder whose mean diameter and material density are 134 μm and 1 330 kg/m3, respectively, the solid velocity is measured by the "activable" tracers method, whereby tracers can be activated when required, in a vertical line 100.0 mm in inside diameter and 24 m in length, when the air velocity is changed from 16.5 m/s to 28.9 m/s and the solid-loading ratio between 48.8 and 82.5. The used nuclide was 56Mn or 82Br. The pipe friction factor for the solid phase was also obtained for the same conditions. The present method is applicable to measurements at high solid-loading ratios.