Summary
The following two-phase properties were evaluated in bubble column reactors with porous plate (5 μm pore diameter) or perforated plate (1 mm and/or 3 mm hole diameter) gas distributors using distilled water or a 1% methanol solution: transverse profiles of the mean and Sauter bubble diameters, local gas holdups, true mean liquid and bubble velocities. Furthermore, swarm bubble velocity distributions were evaluted and compared with calculated values.
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Abbreviations
- D:
-
Column diameter
- d:
-
Bubble diameter (\(\bar d\) or ds)
- dB :
-
Bubble diameter in a swarm (classes)
- EG :
-
Mean relative gas holdup (Eq. (8))
- f:
-
Bubble frequency
- g:
-
Acceleration of gravity
- H:
-
Longitudinal distance in the column
- n:
-
Number of bubbles registered by the electrical conductivity probe
- r:
-
Transverse coordinate
- rB :
-
Bubble radius
- \(\bar U\) :
-
Local true liquid velocity (Eq. (3) or (6))
- UB :
-
Bubble velocity
- UB,C :
-
Bubble velocity calculated by Eq. (10)
- \(\overline{\overline U} _B^ * \) :
-
True local bubble velocity (Eq. (11))
- \(\bar U_B \) :
-
Mean velocity of bubbles of diameter dB
- UBmin:
-
Minimum velocity of bubbles of diameter dB
- \(\overline{\overline U} _B \) :
-
Local mean of velocity distribution of swarm bubbles
- u:
-
Effective recorded liquid velocity (Eq. (1) or (4))
- Ux, uy, uz :
-
Liquid velocity fluctuation components
- uB :
-
Bubble swarm velocity (Eq. (12))
- ur :
-
Relative bubble swarm velocity (Eq. (13))
- VG :
-
Gas holdup
- VL :
-
Liquid holdup
- WSG :
-
Superficial gas velocity
- WSL :
-
Superficial liquid velocity
- ∈g :
-
Local relative gas holdup (Eq. (7))
- up:
-
Upwards
- down:
-
Downwards
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Zakrzewski, W., Lippert, J., Lübbert, A. et al. Investigation of the structure of two-phase flows. Model media in bubble-column bioreactors. European J. Appl. Microbiol. Biotechnol. 12, 69–75 (1981). https://doi.org/10.1007/BF01970037
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DOI: https://doi.org/10.1007/BF01970037