Beschreibung:
<jats:title>Abstract</jats:title><jats:p>Pulse holography and the phase‐Doppler technique are two of the very few methods with which the size and velocity of individual particles within a two‐phase flow may be simultaneously measured. This enables the two‐dimensional frequency distributions of particle size and velocity to be compiled and allows the existence of mutual correlations to be verified.</jats:p><jats:p>The application of both methods to investigations into water droplet collections within the hollow spray cone of a swirl pressure‐jet atomizer is described. When comparing the results of measurements obtained by the two methods under identical conditions, one fundamental difference must be taken into account: whereas pulse holography delivers space‐averaged <jats:italic>concentration</jats:italic>‐<jats:italic>dependent</jats:italic> frequency distributions, those derived from the phase‐Doppler technique are time‐averaged <jats:italic>fluxdependent.</jats:italic> The methods hence deliver different, but equivalent, results. Since the possibility of conversion exists, both representations are always available. As far as the particle <jats:italic>size</jats:italic> distributions are concerned, the results obtained from the two methods confirm the expected differences, whilst verifying the compliance of the interconverted size distribution data. Regarding the <jats:italic>velocity</jats:italic> distributions, however, some unexplained discrepancies still remain.</jats:p>