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This work provides an experimental method for simultaneously measuring finitetime Lyapunov exponent fields for multiple particle groups, including non-flowtracers, in three-dimensional multiphase flows. From sequences of particleimages, e.g., from experimental fluid imaging techniques, we can directlycompute the flow map and coherent structures, with out performing thecomputationally costly numerical integration. This is particularly useful tofind three-dimensional Lagrangian coherent structures for inertial particles,that do not follow the bulk fluid velocity, as we demonstrate for a gridturbulence experiment. The technique described may provide a new means forexploring the physics of experimental multi-phase flows.

Demonstration of Experimental Three Dimensional Finite Time Lyapunov Exponents with Inertial Particles