Affiliations: Universidad de Zaragoza, Departamento de Física
Aplicada, Facultad de Ciencias, 50009 - Zaragoza, Spain
Abstract: This paper discusses the suitability of PIV for measuring
simultaneously the velocity field of every phase and the size and concentration
field of the disperse phases in multiphase flows. Velocity and disperse phase
information are both inferred either directly from the Young's fringe pattern
(far field diffraction function) or from its 2-D Fourier transform
(autocorrelation function). In the first case, the velocity is inferred from
the orientation and spacing of the fringes while the disperse phase size is
inferred from the size of the diffraction halo that modulates the fringes. In
the second case, the velocity and particle shape are related to the position
and shape of the strongest autocorrelation peaks, respectively. Particle sizes
are used to discriminate between phases on the velocity measurements. The
technique has been demonstrated on a high speed air-particle flow, where the
potential for determining air velocities and particle size and velocities are
shown.