THE SIMULATION OF PHASE-DOPPLER ANEMOMETRY BY THE MULTIPLE MULTIPOLE METHOD

When applying phase-Doppler anemometry (PDA) to measurements of mass f lux, one has to deal with errors caused by multiple scattering effects within a PDA measurement volume. Theoretical research on the influenc e of multiple scattering effects on PDA is more promising than experim ental work, because each error source can be treated separately. There fore, we have simulated multiple scattering effects occurring in the m easurement volume by extending a method for light scattering calculati ons to Gaussian beams: the multiple multipole method (MMP). The curren t version of our computer program is able to simulate PDA with any set -up consisting of Gaussian beams, using one or more homogeneous partic les with arbitrary shape and movement and two detectors at any positio n and with an arbitrarily shaped aperture. In this paper we have conce ntrated on multiple scattering effects caused by two equally sized sph eres, a case which is frequently found in atomization.