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Two‐component LDV measurements in a stirred tank
Author(s) -
Mahouast M.,
Cognet G.,
David R.
Publication year - 1989
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690351103
Subject(s) - agitator , rushton turbine , turbulence , micromixing , mechanics , isotropy , reynolds number , mixing (physics) , work (physics) , reynolds stress , standard deviation , turbine , turbulence kinetic energy , physics , materials science , thermodynamics , optics , mathematics , impeller , statistics , quantum mechanics , viscosity
Previous work has shown that in a standard stirred tank, the three‐dimensional velocity field in the discharge flow of the stirrer is characterized by a strong deviation from homogeneous isotropic turbulence. By means of a two‐component laser Doppler velocimeter (2D‐LDV), the \documentclass{article}\pagestyle{empty}\begin{document}$ \overline {v'_r v'_\theta} $\end{document} Reynolds stresses are measured in a 6.3‐dm 3 standard tank stirred by a six‐flat‐blade Rushton turbine. Obviously, these stresses must be known to better understand the turbulent mixing in such a configuration. Moreover, the 2D‐LDV appears to be an efficient tool for characterizing, from an energy viewpoint, the type of agitator used and, in principle, is confirmed to be useful to accurately obtain the length scales of turbulence which are fundamental parameters for the study of the micromixing processes.