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Effect of blade pitch on the structure of the trailing vortex around rushton turbine impellers
Author(s) -
Lu WeiMing,
Yang BingShiou
Publication year - 1998
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450760328
Subject(s) - rushton turbine , impeller , mechanics , vortex , turbulence kinetic energy , turbine , turbulence , materials science , turbine blade , blade (archaeology) , kinetic energy , dissipation , physics , structural engineering , engineering , classical mechanics , thermodynamics
Effect of blade number on the structure of the trailing vortex around the Rushton turbine impeller is examined by analyzing the data of mean velocities, deformation rates, turbulent kinetic energy and energy dissipation rates for 2‐, 4‐, 6‐ and 8‐straight blades disk turbine impellers in a baffled standard geometry stirred tank. The data of Sauter mean bubble diameter near the blade tip are combined with the turbulent characteristics around the vortex to discuss how the blade number and the strength of the vortex affect the performance of the gas dispersion around the Rushton turbines under a low gassing rate. The results of this analysis show that if power input per each blade is the same, the impeller having four blades not only has the strongest average mean deformation rates and the largest turbulent kinetic energy, but also disperses the smallest average bubbles under the same gassing rate.