Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: mieszadło niecentryczne

Sortuj według:

Ogranicz wyniki do:

Numerical study of hydrodynamics in an agitated vessel equipped with ecentrically located high-speed impeller

Domański M., Karcz J.

Czasopismo Techniczne. Chemia

2014

R. 111, z. 2-Ch

19--28

In this study the results of numerical simulations of hydrodynamics in an agitated vessel with eccentrically located impeller (HE3 or propeller) are presented. Mathematical model of the velocity field is based on Navier-Stocks equation. Characteristics of turbulent flow of liquid is described with the use of CFD methods. In this work the Scale Adaptive Simulation approach coupled with Sliding Mesh method is used. The time-dependent simulations were carried out with ANSYS 14 CFX software.

W artykule przedstawiono wyniki symulacji numerycznych hydrodynamiki w mieszalniku z niecentrycznie zbudowanym mieszadłem (HE3 lub śmigłowym). Model matematyczny pola prędkości w aparacie oparty został o równania Naviera-Stocksa. Przepływ burzliwy cieczy został opisany za pomocą modelu burzliwości SAS-SST (Scale Adaptive Simulation – Shear Stress Transport). Symulacje nieustalone w czasie przeprowadzono przy zastosowaniu oprogramowania ANSYS 14 CFX.

Studies of mixing time and momentum transfer for an agitated with an off-centred impeller

Karcz J., Cudak M., Szoplik J.

Polish Journal of Chemical Technology

2006

Vol. 8, nr 1

35-42

In many industrial processes, the final technological effect related to the product quality strictly depends on the efficiency of agitation. The effects of the impeller eccentricity and liquid pumping mode of the impeller on the liquid homogenisation and momentum transfer processes are discussed in the paper. The mixing time tm in an un - baffled agitated vessel of working volume V = 0.27 m^3 was measured using thermal method. The dimensionless shear rate gamma/n and friction coefficient f on the cylindrical wall of the vessel of the volume V = 0.022 m^3 were determined by means of an electrochemical method. The distribution of both gamma/n and f values is found as a function of the impeller eccentricity eR for a propeller and HE 3 impeller. The data for dimensionless mixing time were correlated using Eq. (1). The values of gamma/n and f, averaged for the whole cylindrical wall, were described for both the propeller and HE 3 impeller, by means of Eqs. (2) - (5).