Local velocity and size measurements of particles in dense suspensions: theory and design of endoscopic grating velocimeter-granulometers.
Grating velocimeter-granulometers are devoted to size-velocity measurements of bubbles, droplets, or solid particles carried in flows. Principles that are already used by a phase Doppler particle analyzer are applied to dense suspensions by the use of grating-based endoscopic probes. For these the distance from the sensor to probe volume may be comparable to the particle size and the classical frequency-velocity and phase-radius relationships must be corrected. These corrections are quantified by using a simulation based on ray optics. Finally a probe devoted to mist flows is presented. The dispersion that is due to random parameters, such as particle trajectory; is +/-3% for velocity and less than +/-8% for size.
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