Abstract
In PIV studies published in the literature focusing on the investigation of the flow field in an agitated vessel the record time is ranging from the tenths and the units of seconds. The aim of this work was to determine minimum record time for PIV measurement in a vessel agitated by a Rushton turbine that is necessary to obtain relevant results of velocity field. The velocity fields were measured in a fully baffled cylindrical flat bottom vessel 400 mm in inner diameter agitated by a Rushton turbine 133 mm in diameter using 2-D Time Resolved Particle Image Velocimetry in the impeller Reynolds number range from 50 000 to 189 000. This Re range secures the fully-developed turbulent flow of agitated liquid. Three liquids of different viscosities were used as the agitated liquid. On the basis of the analysis of the radial and axial components of the mean- and fluctuation velocities measured outside the impeller region it was found that dimensionless minimum record time is independent of impeller Reynolds number and is equalled N.tRmin = 103 ± 19.
Highlights
The knowledge of the flow and the flow pattern in an agitated vessel is important for determination of many impeller and turbulence characteristics, e.g. impeller pumping capacity, intensity of turbulence, turbulent kinetic energy, convective velocity, and the turbulent energy dissipation rate
The hydrodynamics and flow field are investigated in an agitated vessel usually using Particle Image Velocimetry (PIV) or Laser-Dopler Anemometry (LDA)
Kysela et al [1] investigated the hydrodynamics in a fully baffled cylindrical flat bottom vessel 300 mm in inner diameter filled by water agitated by a Rushton turbine with impeller speed 300 rpm
Summary
The knowledge of the flow and the flow pattern in an agitated vessel is important for determination of many impeller and turbulence characteristics, e.g. impeller pumping capacity, intensity of turbulence, turbulent kinetic energy, convective velocity, and the turbulent energy dissipation rate. Kysela et al [1] investigated the hydrodynamics in a fully baffled cylindrical flat bottom vessel 300 mm in inner diameter filled by water agitated by a Rushton turbine with impeller speed 300 rpm. They analysed time record of radial mean- and fluctuation velocities measured in the impeller discharge flow. The velocity fields were measured at an impeller rotation speed in the range from 300 rpm to 850 rpm, which covers the impeller Reynolds number range from 50 000 to 189 000 This Re range secures the fully-developed turbulent flow of agitated liquid
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