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Titolo:
Turbulence characteristics in turbine-agitated tanks of different sizes and geometries
Autore:
Wernersson, ES; Tragardh, C;
Indirizzi:
Univ Lund, S-22100 Lund, Sweden Univ Lund Lund Sweden S-22100Univ Lund, S-22100 Lund, Sweden
Titolo Testata:
CHEMICAL ENGINEERING JOURNAL
fascicolo: 2, volume: 72, anno: 1999,
pagine: 97 - 107
SICI:
1385-8947(19990208)72:2<97:TCITTO>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
LASER-DOPPLER MEASUREMENTS; ENERGY-SPECTRUM FUNCTION; RUSHTON TURBINE; STIRRED VESSELS; FLOW; DISSIPATION; IMPELLERS;
Keywords:
anemometry measurements; geometry; turbulent kinetic energy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Tragardh, C Univ Lund, POB 124, S-22100 Lund, Sweden Univ Lund POB 124 Lund Sweden S-22100 4, S-22100 Lund, Sweden
Citazione:
E.S. Wernersson e C. Tragardh, "Turbulence characteristics in turbine-agitated tanks of different sizes and geometries", CHEM ENGN J, 72(2), 1999, pp. 97-107

Abstract

Velocity measurements have been conducted with constant temperature anemometry in three reactors, with diameters of 0.8, 1.88 and 2.09 m. Their impeller-to-tank-diameter ratios were 3, 2.47 and 3, and they were equipped withtwo three and four Rushton turbines. Turbulence parameters, intensity, turbulent kinetic energy, local energy dissipation rate and energy spectra, were calculated from the measured data. The turbulent kinetic energy was constant in the local flow situation, when scaled with the square of the convective velocity. This was independent of position, agitation rate and size ofreactor, in the impeller zone. The energy spectra in the impeller zone were almost constant when scaled with the local energy dissipation length, independent of position, agitation rate and size of reactor. The local energy dissipation rate scaled with the cube of the convective velocity and impeller diameter. (C) 1999 Elsevier Science S.A. All rights reserved.

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Documento generato il 27/09/20 alle ore 01:05:14