Distribution of the local heat transfer coefficient in the agitated vessel equipped with turbine impellers

• Autorzy: Broniarz-Press L. , Różańska S.
• Języki publikacji: EN

Abstrakty

EN

The results of experimental studies on the distribution of a local heat transfer coefficient on the vertical wall of the agitated vessel have been presented. Four various type turbine impellers were used (Rushton turbine, paddle with 6 pitched blade of the angles of beta = 45, 90 and 135°). The experiments were carried out for the Newtonian and shear-thinning fluids without yield stress (Na-CMC and guar gum).The potassium ferri-and ferrocyanide solutions with the sodium hydroxide and potassium sulphate as the supporting electrolytes have been used as the Newtonian model solutions. For the shear-thinning media the formula of the Reynolds number proposed by Metzner and Otto Re(MO), has been applied. The results of the experimental studies in the graphical form have been presented. The common relationships for the Newtonian and non-Newtonian fluids have been obtained.

Słowa kluczowe

EN

mixing; local heat transfer; Chilton-Colburn analogy; limiting diffusion current; shear-thinning fluids

PL

mieszanie; wnikanie ciepła; wymiana ciepła; współczynnik wnikania ciepła; mieszalnik

• Wydawca: West Pomeranian University of Technology. Publishing House
• Czasopismo: Polish Journal of Chemical Technology
• Rocznik: 2006
• Tom: Vol. 8, nr 4
• Strony: 27--30
• Opis fizyczny: Bibliogr. 9 poz., rys., tab.

Twórcy

autor

Broniarz-Press L.

autor

Różańska S.

• Division of Chemical Engineering and Equipment, Faculty of Chemical Technology, Poznan University of Technology, pl. M. Sklodowskiej-Curie 2, 60-965 Poznan,

Bibliografia

• (1) Karcz J.: Momentum transfer in a region of an agitated vessel wall, Inż, Chem. Proc, 1996, 17, 403.
• (2) Stręk F., Karcz J.: Wpływ geometrii układu na wnikanie ciepła w mieszalnikach, Prace Wydziału Inżynierii Chemicznej i Procesowej Politechniki Warszawskiej, 1999, 25, 241.
• (3) Stręk F.: Mieszanie i mieszalniki, WNT, Warszawa 1981
• (4) Stręk F., Jaworski Z., Karcz J.: Investigation of local heat transfer coefficient in the wall region of a cylindrical vessel agitated by a turbine impeller, Inż. Chem. Proc, 1981 1, 841.
• (5) Karcz J., Michalska M., Stręk F.: Wymiana ciepła w mieszalniku zaopatrzonym w pionowe rurowe elementy grzejne, Materiały XV Ogólnopolskiej Konferencji Naukowej Inżynierii Chemicznej i Procesowej, II, 75 - 78, Gdańsk, 1995.
• (6) Broniarz-Press L., Rozanska S.: Local values of friction coefficient for shear-thinning fluids in agitated vessel, Proceedings of the 7th World Congress of Chemical Engineering, P42 - 058, 1 - 10, Glasgow, Scotland, 2005.
• (7) Chilton T. H., Colburn A. P.: Mass transfer (absorption) coefficient. Prediction from data on heat transfer an fluid friction, Ind. Eng. Chem., 1934, 26, 1183.
• (8) Gluz M. D., Pavlušenko I. S.: Experimental studies on heat transfer in non-Newtonian fluids, in Russian, •urn. Prikl. Chimii, 1966, 39, 2475.
• (9) Metzner A. B., Otto R. E.: Agitation of non-Newtonian fluids, AIChE Journal, 1957, 3, 3.