Main frequency Vortex flow 2 Acoustic analysis 1 Acoustic signals 1 Acoustic waves 1 Centrifugal pumps 1 Energy dissipation 1 Entropy 1 Entropy production 1 Fast Fourier transforms 1 Flow regions 1 Impellers 1 Inlet pressures 1 Internal flow characteristics 1 Kinetic energy 1 Kinetics 1 Navier Stokes equations 1 Orifice diameters 1 Orifices 1 Performance 1 Pre-swirl 1 Production loss 1 Pulsation amplitude 1 Ranque-Hilsch vortex tube 1 Shear stress 1 Swirl angles 1 Thermofluids 1 Tubes (components) 1 Turbulence models 1 Velocity pulsation 1