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This paper presents the analysis of the particle-laden liquid metal wake flowaround a cylindrical obstacle at different obstacle Reynolds numbers. Particlesin liquid metal are visualized using dynamic neutron radiography. We presentthe results of particle tracking velocimetry of the obstacle wake flow using animproved version of our image processing and particle tracking code MHT-X. Thelatter now utilizes divergence-free interpolation of the particle imagevelocimetry field used for motion prediction and particle trajectoryreconstruction. We demonstrate significant improvement over the previouslyobtained results by showing the capabilities to assess both temporal andspatial characteristics of turbulent liquid metal flow, and validating theprecision and accuracy of our methods against theoretical expectations,numerical simulations and experiments reported in literature. We obtain theexpected vortex shedding frequency scaling with the obstacle Reynolds numberand correctly identify the universal algebraic growth laws predicted andobserved for trajectory curvature in isotropic homogeneous two-dimensionalturbulence. Particle residence times within the obstacle wake and velocitystatistics are also derived and found to be physically sound. Finally, weoutline potential improvements to our methodology and plans for furtherresearch using neutron imaging of particle-laden flow.

Particle tracking velocimetry and trajectory curvature statistics for particle-laden liquid metal flow in the wake of a cylindrical obstacle