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Semianalytical characterization of turbulence from radial impellers, with experimental and numerical validation
Author(s) -
BenNun Ronen,
Sheintuch Moshe,
Kysela Bohuš,
Konfršt Jiří,
Fořt Ivan
Publication year - 2015
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.14723
Subject(s) - impeller , turbulence , mechanics , scalar (mathematics) , computational fluid dynamics , jet (fluid) , laser doppler velocimetry , reynolds averaged navier–stokes equations , physics , classical mechanics , mathematics , geometry , medicine , blood flow
Based on conventional turbulent jet theory and the general theoretical framework of scalar dispersion in turbulent shear flows, a novel formulation of the radial impeller's jet in stirred tanks is introduced. Whereas previous studies considered the impeller's jet as developed, it is now comprised of two separate spatial regions along the radial axis: the zone of flow establishment (ZFE) and the zone of established flow (ZEF). This formulation is accompanied with semi‐analytical expressions for the prediction of turbulent key parameters including the random part of k and ε in the ZFE. The new theoretical framework is validated both with laser Doppler anemometry measurements and with 3‐D numerical simulations using the standard k − ε turbulent model. © 2015 American Institute of Chemical Engineers AIChE J , 61: 1413–1426, 2015