Anémométrie Phase Doppler en milieux multiphasiques : vers de nouvelles possibilités

INSA, Rouen

Abstract

To master two or multi-phase flows it is necessary to have a close dialogue between theory, numerical simulation and experiments. Optical techniques are often used because they give the possibility of local, in situ and on line measurements. For example a phase Doppler anemometer measures the size and the velocity of individual particles in flows. Nevertheless, classical phase Doppler are limited by the finite size of the optical probe created by two focused laser beams, leading to so-called "Gaussian beam effects". New geometries, free of Gaussian beam effects, are introduced. With these geometries the quality of flux measurements is improved and the phase Doppler technique can be extended to the measurement of the refractive index of the particles.