Temat: kolumna barbotażowa - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Multifractal properties of large bubble paths in a single bubble column
Autorzy:: Mosdorf, R.
Wyszkowski, T.
Dąbrowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/240028.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: kolumna barbotażowa
metoda WTMM
pęcherze
bubble column
bubble dynamics
WTMM method
Opis:: In the paper the paths of bubbles emitted from the brass nozzle with inner diameter equal to 1.6 mm have been analyzed. The mean frequency of bubble departure was in the range from 2 to 65.1 Hz. Bubble paths have been recorded using a high speed camera. The image analysis technique has been used to obtain the bubble paths for different mean frequencies of bubble departures. The multifractal analysis (WTMM - wavelet transform modulus maxima methodology) has been used to investigate the properties of bubble paths. It has been shown that bubble paths are the multifractals and the influence of previously departing bubbles on bubble trajectory is significant for bubble departure frequency f[b] > 30 Hz.
Źródło:: Archives of Thermodynamics; 2011, 32, 1; 3-20
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Energy consumption in terms of shear stress for two types of membrane bioreactors used for municipal wastewater treatment processes
Autorzy:: Ratkovich, N.
Bentzen, T.
Rasmussen, M.
Powiązania:: https://bibliotekanauki.pl/articles/240465.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: bioreaktor membranowy
kolumna barbotażowa
naprężenie
bubble column
CFD
membrane bioreactor (MBR)
shear stress
Opis:: Two types of submerged membrane bioreactors (MBR): hollow fiber (HF) and hollow sheet (HS), have been studied and compared in terms of energy consumption and average shear stress over the membrane wall. The analysis of energy consumption was made using the correlation to determine the blower power and the blower power demand per unit of permeate volume. Results showed that for the system geometries considered, in terms the of the blower power, the HF MBR requires less power compared to HS MBR. However, in terms of blower power per unit of permeate volume, the HS MBR requires less energy. The analysis of shear stress over the membrane surface was made using computational fluid dynamics (CFD) modelling. Experimental measurements for the HF MBR were compared with the CFD model and an error less that 8% was obtained. For the HS MBR, experimental measurements of velocity profiles were made and an error of 11% was found. This work uses an empirical relationship to determine the shear stress based on the ratio of aeration blower power to tank volume. This relationship is used in bubble column reactors and it is extrapolate to determine shear stress on MBR systems. This relationship proved to be overestimated by 28% compared to experimental measurements and CFD results. Therefore, a corrective factor is included in the relationship in order to account for the membrane placed inside the bioreactor.
Źródło:: Archives of Thermodynamics; 2012, 33, 2; 85-106
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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