Bubble coalescence behaviour in biological media |
| |
Authors: | I Adler H Buchholz J Voigt R Wittler K Schügerl |
| |
Institution: | (1) Institut für Technische Chemie der Universität Hannover, Callinstr. 3, D-3000 Hannover, Federal Republic of Germany |
| |
Abstract: | Summary Volumetric mass transfer coefficients (kLa) were measured by a steady state method in a twin bubble column to characterize the coalescence behaviour of the medium. Employing Hansenula polymorpha cultivation broths, kLa values were compared with those measured in model media in the presence and absence of antifoam agents. The ratio of the volumetric mass transfer coefficient in the system investigated to that in water,
, was employed to characterize the cultivation medium.Symbols a
Specific gas/liquid interfacial area with regard to the liquid volume in reactor
- de
Dynamical equilibrium bubble diameter
- dH
Perforated plate hole diameter
- dp
Primary bubble diameter
- dS
Sauter bubble diameter
- Fv
Liquid feed rate
- H
Bubbling layer height
- kL
Gas/liquid mass transfer coefficient
- kLa
Volumetric mass transfer coefficient
- m
kLa/(kLa)r coalescence index
- mcorr
Corrected coalescence index Eq. (3)]
- OTR
Oxygen transfer rate
- PO
Dissolved O2-partial pressure in BS2
- P1
Dissolved O2-partial pressure in BS1
- PO
PO/PS relative oxygen saturation in BS2
- P1
P1/PS relative oxygen saturation in BS1
- PS
Saturation dissolved oxygen partial pressure
- Rc
dnB/dt coalescence rate
- S
Substrate concentration
- tF
Time since the beginning of the cultivation
- X
Biomass concentration
- V1
Liquid volume in BS1
- wSG
Superficial gas velocity in BS1
-
G
Gas holdup in BS1
- 1
V1/Fv mean liquid residence time in BS1
- BS1
O2 absorber column
- BS2
O2 desorber column
- D
Desmophen (antifoam agent)
- NS
Nutrient salt solution (Table 1) |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|