Fourier spectrum to recover deterministic and stochastic behavior in stirred tanks

• Velocity data from the impeller region of Rushton and 6SRGT pilot-scale impellers were analyzed both in the frequency domain and with respect to periodicity. The four characteristic frequencies and their combination were detected from the Fourier spectrum, and the deterministic part of the signal was recovered by making the amplitude of the other frequencies zero. The deterministic part was then analyzed with tools from nonlinear theories. For the two turbine-types, the dynamics of the deterministic velocity parts were almost identical. The turbulent part of the signal could also be estimated in a similar manner.

Nyckelord

turbine-agitated tank

rushton turbine

time-series

turbulence

system

power

flow

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)