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The radial relative velocity between particles suspended in turbulent flowplays a critical role in droplet collision and growth. We present a simple andaccurate approach to RV measurement in isotropic turbulence - planar 4-frameparticle tracking velocimetry - using routine PIV hardware. This studydemonstrates the feasibility of accurately measuring RV using routine hardwareand verifies, for the first time, the path-history and inertial filteringeffects on particle-pair RV at large particle separations experimentally.

Particle-Pair Relative Velocity Measurement in High-Reynolds-Number Homogeneous and Isotropic Turbulence Using 4-Frame Particle Tracking Velocimetry