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- W66222316 abstract "In this work, three-dimensional phase-resolved Laser-Doppler measurements were performed in a standard baffled stirred tank reactor, filled with water and driven by a Rushton turbine at a Reynolds number of 2.9-10''. By discrimination between data measured at different angles with respect to the impeller blades, averaged phase-resolved flow fields were obtained. The three-dimensional set-up facilitated an accurate velocity bias correction scheme and measurement of the full set of Reynolds stresses. Three-dimensional Laser-Doppler Anemometry (LDA) requires alignment of the six incident laser beams. To achieve accurate alignment a new, high resolution alignment system was developed. It consists of a small mirror, 50 fim in diameter, attached onto a sheet of glass and meets high demands concerning accuracy, time needed for alignment and water resistance. Due to strict demands on data validation, data rates were very low. To compensate for this as much as possible, several tests were carried out to optimize data quantity and quality. Velocity measurements were carried out in a dense grid in a vertical plane midway between two baffles. Velocity vector plots from three planes of view are presented and showed common features of the flow past Rushton impeller blades. The vorticity of the flow field was calculated to find the position of the core of the traihng vortices, which originate at the inner tips of the impeller blades. The Reynolds stress tensor was used to determine the rate of anisotropy of the turbulent flow according to the Lumley triangle. Turbulent flow in the vortex core tends to ID anisotropy. At larger radial distances and close to the impeller disc the fiow is more or less 3D isotropic." @default.
- W66222316 created "2016-06-24" @default.
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- W66222316 date "1997-07-01" @default.
- W66222316 modified "2023-09-24" @default.
- W66222316 title "Three-dimensional phase-resolved Laser-Doppler measurements in a stirred tank" @default.
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