Falling Velocity of a Particle in a Sinusoidally Oscillating Fluid

Abstract

Time-averaged falling velocities of three sizes of spherical particles (d=8.0, 12.7, 15.9 mm) have been measured in vertically oscillating water. Drag coefficients were calculated, based both on a force balance equation of a free particle in an accelerating fluid and using a measured particle velocity. The calculated drag coefficient was predicted by a drag coefficient obtained from the 2/3-power law of energy dissipation. The experimental particle velocities were compared with the numerically calculated values, and agreement was within ±5% error.