Distributions of the local shear rate values in boundary layer of the agitataed vessel

• Autorzy: Broniarz-Press L. , Różańska S.
• Konferencja: Third International Conference on Engineering Rheology, ICER 2005
• Języki publikacji: EN

Abstrakty

EN

The results of experimental studies on the distribution of shear rate on the vertical wall agitated vessel, equipped with four various impellers, have been presented. The experimental studies were carried out for two model polymer solutions, carboxymethylcellulose sodium salt (Na-CMC) and guar gum. The experimental results of the local shear rate distribution in non-Newtonian liquid agitated by different impellers, have been presented. It has been established that for studies on hydrodynamics in boundary layer and evaluation of local values of shear rate in Na-CMC and guar gum aqueous solutions by the electrochemical method the following solution of 0.005 [kmol/m3] K3[Fe(CN)6], 0.005 [kmol/m3] K4[Fe(CN)6] and 0.3 [kmol/m3] K2SO4 can be recommended. The greatest values of shear rate have been obtained for Rushton turbine whereas the lowest values occurred for paddle with 6 pitched blade of the angles of 135°.

Słowa kluczowe

EN

local shear rate; electrolyte; electrochemical method

PL

elektrolity; metoda elektrochemiczna; ścinanie

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2005
• Tom: Vol. 10, no spec
• Strony: 213--218
• Opis fizyczny: Bibliogr. 8 poz., rys., tab., wykr.

Twórcy

autor

Broniarz-Press L.

• Division of Chemical Engineering and Equipment, Faculty of Chemical Technology Poznań University of Technology, PL 60-965 Poznań, POLAND

autor

Różańska S.

• Division of Chemical Engineering and Equipment, Faculty of Chemical Technology Poznań University of Technology, PL 60-965 Poznań, POLAND

Bibliografia

• [1] Karcz J. (1996): Momentum transfer in a wall region of an agitated vessel wall. - Chem. Process Eng., vol. 17, No. pp.403-421.
• [2] Karcz J. and Cudak M. (2000): Momentum transfer in an agitated vessel equipped with an eccentrically local impeller. - Proceedings of the 15th International Congress of Chemical and Process Engineering CHISA’2 No. 149, Praha.
• [3] Metzner A.B. and Otto R.E. (1957): Agitation of non-Newtonian fluids. - AIChE J., vol.3, No.l, pp.3-10.
• [4] Sobolik V. et al. (1998): Electrochemical measurement of velocity gradients at the vessel bottom with axial hit speed impeller and radial baffles. - Proceedings of the 14th International Congress of Chemical and Engineering CHISA’1998, Praha.
• [5] Sobolik V. et al. (1999): Velocity gradient components at bottom and wall of mixing vessel. - 2lh European Congress Chemical Engineering ECCE 2, Montpellier, Recent Progr. Génie Proc. vol. 13, pp.67-74.
• [6] Stręk F. (1981): Agitation and Agitators (in Polish). - Warszawa: WNT.
• [7] Wichterle K. et al. (1985): Shear stresses on the wall of agitated vessel. - Chem. Eng. Commun., vol. 32, pp.289-305.
• [8] Wichterle K. et al. (1988): Shear stresses on the walls of vessels with axial impellers. - Chem. Eng. Res. Des., vol.66, pp. 102-106.