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Local turbulent energy dissipation rate in an agitated vessel: experimental and turbulence scaling
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SYSNO ASEP 0484246 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Local turbulent energy dissipation rate in an agitated vessel: experimental and turbulence scaling Author(s) Ditl, P. (CZ)
Šulc, R. (CZ)
Pešava, V. (CZ)
Jašíková, D. (CZ)
Kotek, M. (CZ)
Kopecký, V. (CZ)
Kysela, Bohuš (UH-J) SAI, ORCID, RIDSource Title Theoretical Foundations of Chemical Engineering. - : Pleiades Publishing - ISSN 0040-5795
Roč. 52, č. 1 (2018), s. 122-134Number of pages 13 s. Publication form Print - P Language eng - English Country RU - Russian Federation Keywords turbulence ; mixing ; particle image velocimetry ; turbulent energy dissipation rate ; energy spectrum function ; Rushton turbine Subject RIV JP - Industrial Processing OECD category Fluids and plasma physics (including surface physics) R&D Projects GA16-20175S GA ČR - Czech Science Foundation (CSF) Institutional support UH-J - RVO:67985874 UT WOS 000426897400016 EID SCOPUS 85042854670 DOI https://doi.org/10.1134/S0040579518010037 Annotation The hydrodynamics and the flow field in an agitated vessel were measured using 2-D time resolved particle image velocimetry (2-D TR PIV). The experiments were carried out in fully baffled cylindrical flat bottom vessels 300 and 400 mm in inner diameter. The 300 mm inner diameter tank was agitated by a Rushton turbine 100 mm in diameter, and the 400 mm inner diameter tank was agitated by a Rushton turbine 133 mm in diameter. Three liquids of different viscosities were used as the agitated liquid: (i) distilled water (nu = 9.35 x 10(-7) m(2)/s), (ii) a 28 vol % aqueous solution of glycol (nu = 2 x 10(-6) m(2)/s), and (iii) a 43 vol % aqueous solution of glycol (nu = 3 x 10(-6) m(2)/s). The velocity fields were measured at an impeller rotation speed in the range from 300 to 850 rpm, which covers the Reynolds number range from 50000 to 189000. This means that fullydeveloped turbulent flow was reached. The experiments were performed to investigate the applicability of the following relations: epsilon* = epsilon/(u (4)/nu) = const, vK/u = const, I >/eta K = const, tau(I >)/tau(K) = const, epsilon* = epsilon/((Nd)4/nu) = const, I >/d ae Re-1, eta K/d ae Re-1, vK/(Nd) = const, N tau(I >) ae R-1, N tau(K) ae Re-1, and epsilon/(Nq) ae Re. These formulas were theoretically derived in our previous work, using turbulence theory, in particular, using turbulence spectrum analysis. The correctness of the proposed relations is investigated by statistical hypothesis testing. Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2019
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