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http://yadda.icm.edu.pl:80/baztech/element/bwmeta1.element.baztech-article-BPK6-0014-0042

Czasopismo

Chemical and Process Engineering

Tytuł artykułu

A study on blending characteristics of axial flow impellers

Autorzy Fort, I.  Jirout, T. 
Treść / Zawartość
Warianty tytułu
Języki publikacji EN
Abstrakty
EN This paper presents an analysis of the blending characteristics of axial flow high-speed impellers under a turbulent regime of flow of an agitated low viscosity liquid. The conductivity method is used to determine the time course of blending (homogenisation) of miscible liquids in a pilot plant fully baffled mixing vessel, and a torquemeter is used for measuring the impeller power input in the same system. Four-blade and six-blade pitched blade impellers and three high efficiency axial flow impellers are tested for the given degree of homogeneity (98%). The experimental results and also the results of the authors' previous study, in accordance with the theoretical approach described in the literature, show that there is a universal relationship between the impeller power number and the dimensionless blending time, taking into consideration the impeller-to-vessel diameter ratio, independent of the geometry of the axial flow impeller but dependent on the degree of homogeneity. This relationship is found to be valid on a pilot plant scale under a turbulent flow regime of an agitated liquid.
Słowa kluczowe
PL wirnik osiowy   wirnik tarczowy   przepływ burzliwy  
EN axial flow impeller   pitched-blade impeller   turbulent flow   impeller power input   blending time  
Wydawca Komitet Inżynierii Chemicznej i Procesowej Polskiej Akademii Nauk
Czasopismo Chemical and Process Engineering
Rocznik 2011
Tom Vol. 32, nr 4
Strony 311--319
Opis fizyczny Bibliogr. 11 poz., rys., tab.
Twórcy
autor Fort, I.
autor Jirout, T.
  • Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Process Engineering, Technicka 4, 166 07 Prague 6, Czech Republic
Bibliografia
1. Fort I., 1989. Flow and turbulence in vessels with axial impellers, In: Uhl V.W., Gray J.B. (Eds.), Mixing, theory and practice, Vol. III. Academic Press, New York, 133 - 197.
2. Fort I., Jirout T., Rieger F., Allner R., Sperling R., 2001. Study of the blending efficiency of pitched blade impellers. Acta Polytechnica ,41,7- 13.
3. Grenville R. K., Nienow A. W., 2003. Blending in miscible liquid, In: Paul E. L., Otiemo-Obeng V. A., Kresta S. M. (Eds.), Industrial mixing. Science and practice. Wiley Interscience, New York, 507 - 542.
4. Khang S. J., Levenspiel O., 1976. New scale-up and design criteria for stirrer agitated batch mixing vessels. Chem Eng. Sci., 31, 569-577. DOI: 10.1016/0009-2509(76)80020-6.
5. Kramers H., Baars G. M., Knoll W. H., 1953. A comparative study on the rate of mixing in stirred tanks. Chem. Eng. Sci., 2, 35-42. DOI: 10.1016/0009-2509(53)80006-0.
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7. Liu M., 2011b. Quantitative characterisation of mixing in stirred tank reactors with mean age distribution. Can. Jour. Chem. Eng., 89, 1018-1028. DOI: 10.0122/cjce.20563.
8. Mavros P., Xuereb C, Fort I., Bertrand J., 2002. Investigation by laser Doppler velocimetry of the effects of liquid flow rates and feed positions on the flow patterns induced in a stirred tank by an axial - flow impeller. Chem. Eng. Sci., 57, 3939 - 3952. DOI: 10.1016/0009 - 2509(02)00268-3.
9. Nienow A. W., 1997. On impeller circulation and mixing effectiveness in the turbulent regime. Chem. Eng. Sci, 52 , 2557-2565. DOI: 10.1016/0009 - 2509(97)00072-9.
10. Prochazka J., Landau J., 1961. Homogenization of miscible liquids by rotary impellers. Collect. Czech. Chem. Commun., 26, 2961-2974.
11. Seichter P., Pesl L., 2005. Design of rotary impellers - science or art? CHEMagazin, 15(2), 8-11 (in Czech).
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