Počet záznamů: 1  

Semianalytical characterization of turbulence from radial impellers, with experimental and numerical validation

  1. 1.
    0438382 - ÚH 2016 RIV US eng J - Článek v odborném periodiku
    Ben-Nun, R. - Sheintuch, M. - Kysela, Bohuš - Konfršt, Jiří - Fořt, I.
    Semianalytical characterization of turbulence from radial impellers, with experimental and numerical validation.
    AIChE Journal. Roč. 61, č. 4 (2015), s. 1413-1426. ISSN 0001-1541. E-ISSN 1547-5905
    Grant CEP: GA ČR GAP101/12/2274
    Institucionální podpora: RVO:67985874
    Klíčová slova: turbulent jet * mixing * radial impeller * stirred tank * Rushton turbine
    Obor OECD: Fluids and plasma physics (including surface physics)
    Impakt faktor: 2.980, rok: 2015

    We characterize turbulent flow from radial impellers in stirred tanks, formulating semi-analytical predictions based on conventional turbulent-jet theory and the general framework of scalar dispersion in turbulent shear flows. This work introduces a novel formulation of the radial-discharge flow as two separate spatial regions along the radial axis: the zone of flow establishment (ZFE) and the zone of established flow (ZEF). We discover and analyze resulting critical improvements in the prediction of key parameters of turbulent kinetic energy and associated dissipation rate. Further, we derive and examine functional forms of the random turbulence in the ZFE region, based upon empirical inputs of averaged radial velocity as well as related calibration coefficients. Finally, we validate this new theoretical framework, both with laser Doppler anemometry (LDA) measurements, and with three-dimensional numerical simulations using the standard k-ε turbulent model. This article is protected by copyright. All rights reserved.
    Trvalý link: http://hdl.handle.net/11104/0249242

     
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