In this study the liquid flow in a reverse-flow hydrocycloneis studied experimentally using the Lagrangianapproach. Resin beads with densities that are close to thedensity of the liquid in which they move, i.e. neutraldensityparticles, are used to model a fluid element inthe highly turbulent flow in a hydrocyclone separator andtracked using PEPT with a temporal resolution of up to0.5 ms. A method of producing neutral-density particles forPEPT was developed. The data processing algorithm wasimproved for the extra challenging tracking conditions thatwere encountered. The components of velocity,which revealthe detailed velocity field of the fluid, were calculated fromthe positions of the tracers. Various noise-removal methods,again to cope with the challenging tracking conditions, wereapplied and discussed.
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