Application of the electrochemical method for the specification of flow and heat transfer in non-Newtonian media

• Autorzy: Broniarz-Press L. , Różańska S.
• Konferencja: "Modelling of Multiphase Flows in Thermo-Chemical Systems. Advanced Measurement Techniques" / sympozjum [5th; September 2nd - 4th, 2005; Stawiska near Gdansk, Poland]
• Języki publikacji: EN

Abstrakty

EN

In the study the electrochemical results of the friction factor in boundary layer and heat transfer distribution coefficient 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 friction factor and heat transfer coefficient 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 common relationship {for a given type of an impeller) between local values of friction coefficient and heat transfer coefficient and Reynolds number proposed by Metzner & Otto (1957) for Newtonian and non-Newtonian fluids have been obtained. The greatest mean values of both coefficients have been obtained for Rushton turbine whereas the lowest values occurred for paddle with 6 pitched blade of the angles of 135st.

Słowa kluczowe

EN

non-Newtonian fluid; heat transfer; friction factor; electrochemical method

PL

ciecz nienewtonowska; transport ciepła; współczynnik tarcia; metoda elektrochemiczna

• Wydawca: Wydawnictwo Politechniki Częstochowskiej
• Czasopismo: Turbulence : international journal
• Rocznik: 2005
• Tom: Vol. 11
• Strony: 65--74
• Opis fizyczny: Bibliogr. 10 poz.

Twórcy

autor

Broniarz-Press L.

• Poznań University of Technology, Faculty of Chemical Technology M. Sklodowskiej-Curie 2,60-965 Poznań, Poland

autor

Różańska S.

• Poznań University of Technology, Faculty of Chemical Technology M. Sklodowskiej-Curie 2,60-965 Poznań, Poland

Bibliografia

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• [3] Strek F., Karcz J., Application of an electrochemical method for the studies of a mass transfer process at the vicinity of a wall of an agitated vessel, Chemical and Process Engineering (Poland) 1999, 20, 3-22.
• [4] Karcz J., Cudak M., Momentum transfer in an agitated vessel equipped with an eccentrically located impeller, Proceedings of the 15th International Congress of Chemical and Process Engineering CHISA 2002, Paper No. 149, Praha.
• [5] Wichterle K et al., Shear stresses on the walls of vessels with axial impellers, Chem. Eng. Res. Des. 1988, 66,102-106.
• [6] Jirout T. et al., Electrochemical measurement of impeller speed for off-bottom suspension, Chem. Proc. Eng. (Poland) 2005, 26,485-497.
• [7] Chilton T.H., Colburn A.P., Mass transfer (absorption) coefficient. Prediction from data on heat transfer and fluid friction, Ind. Eng. Chem. 1934, 26 (11), 1183-1187.
• [8] Strek F., Mieszanie i mieszalniki, WNT, Warszawa 1981.
• [9] Metzner A.B., Otto R.E., Agitation of non-Newtonian fluids, AIChE Journal 1957, 3, 3-10.
• [10] Wichterle K., Żak L., Mitschka P., Shear stresses on the wall of agitated vessel, Chem. Eng. Comm. 1985, 32, 289-305.