Wyniki wyszukiwania - BazTech

1

Efektywna powierzchnia wymiany masy dla początkowej fazy samozasysania gazu

Kurasiński T., Kuncewicz C.

Inżynieria i Aparatura Chemiczna

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2006

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Nr 6s

132-133

EN

Measurement results of coefficients kL. and kLa are discussed in the paper. Based on local values, the effective mass transfer area in the whole tank was determined. For the height equal to the impeller position, a non-typical decrease of the effective mass transfer area was observed. This phenomenon confirmed that the entire real surface of gas bubbles did not take part in the mass transfer.

2

Porównanie szybkości wnikania masy w wodzie i w ściekach modelowych podczas napowietrzania mieszadłami samozasysającymi

Kurasiński T., Kuncewicz C., Stelmach J.

Inżynieria i Aparatura Chemiczna

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2005

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Nr 4s

45-46

EN

Measurement results of the volumetric mass transfer coefficient in water and model sewage during aeration with a self-aspiration disk impeller of diameter d = 125 mm are presented in the paper. It was showed that the optimum impeller work did not depend on ions presence in the solution.

3

Lokalne wartości kLa w mieszalniku dla układu gaz - ciecz

Kurasiński T., Kuncewicz A., Stelmach J.

Inżynieria i Aparatura Chemiczna

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2005

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Nr 5s

36-40

PL

W pracy zaproponowano zmodyfikowane stanowisko do pomiarów lokalnych wartości objętościowego współczynnika wnikania masy kLa metodą dynamiczną. Przeanalizowano poszczególne elementy stanowiska pod względem identyfikacji parametrów wpływających na jakość pomiarów. Przeprowadzono analizę współczynnika kja dla układu woda - powietrze przy zastosowaniu tarczowego mieszadła samozasysającego o średnicy dm = 125 mm.

EN

A modified set-up for measuring local values of the volumetric mass transfer coefficient, ki.a, by a dynamic method was proposed. The particular elements of set-up were analysed with respect to identification of parameters influencing the measurement quality. Local values of the ki.a coefficient for the water-air system were analysed using a self-aspirating disk impeller of diameter dm — 125 mm.

4

The application of sample and hold method in the processing of data obtained from a laser doppler anemometer

Stelmach J., Rzyski E.

International Journal of Applied Mechanics and Engineering

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2002

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Vol. 7, no 4

1291-1303

EN

Using a laser Doppler anemometer, liquid velocity was measured in the tank in which liquid was mixed by a self-aspirating disk impeller. The energy spectrum was the basis to determine the energy dissipation rate. This rate determines the size of eddies that are formed in the vicinity of the impeller. Results obtained by sample and hold method were compared with those obtained by other methods. An increase in the sampling frequency caused a decrease in the mean liquid velocity at the measuring point.

5

Gas hold-up for self-aspirating impellers

Heim A., Kuncewicz Cz., Rzyski E., Stelmach J.

Applied Mechanics and Engineering

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2000

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Vol. 5, no 3

685-693

EN

Gas hold-up for self-aspirating disk impellers was determined experimentally. Process parameters such as rotations frequency, impeller size and height of liquid level over the impeller were found to have the greatest impact on its value. The effect of viscosity of the liquid being aerated is much weaker - the investigations were carried out with several liquids differing in viscosity. It was also found that the width of the outlet slots of the impeller had a slight influence on gas hold-up.