| Abstrakt: |
Phase Doppler anemometry (PDA) measurements are reported on the centreline of an upward annular gas-liquid two-phase flow in a 32 mm diameter pipe with a 7.3 m development length. Two scattering angles (30° and 70°) have been considered, together with optical geometries which provide probe volume lengths/diameters of 4.90 mm/155 μm and 9.56 mm/302 μm respectively. The sizing ranges cover spherical droplets up to a maximum of 843 μm. The measurements clearly show that, whereas the number mean diameter (d10shows little variation with either scattering angle or optical geometry, significant differences are evident with the Sauter mean diameter (d32) due to the influence of a relatively small number of large droplets (400 μm) observed with the 30° scattering angle. |
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