Abstract
A three-dimensional transient modeling of a two-phase partitioning bioreactor, combining system hydrodynamics, two simultaneous mass transfer and microorganism growth is modeled using computational fluid dynamics code FLUENT 6.2. The simulation is based on standard “k–ε” Reynolds-averaged Navier–Stokes model. Population balance model is implemented in order to describe gas bubble coalescence, breakage and species transport in the reaction medium and to predict oxygen volumetric mass transfer coefficient (kLa). Model results are verified against experimental data and show good agreement as 13 classes of bubble size is taking into account. Flow behavior in different operational conditions is studied. Almost at all impeller speeds and aeration intensities there were acceptable distributions of species caused by proper mixing. The magnitude of dissolved oxygen percentage in aqueous phase has a direct correlation with impeller speed and any increasing of the aeration magnitude leads to faster saturation in shorter periods of time.
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Abbreviations
- \(\upalpha\) :
-
Interfacial area per unit volume (m−1)
- \(b\left( {\upsilon_{k} :\nu_{l} } \right)\) :
-
Break-up frequency
- \(c\left( {\upsilon_{k} ,\nu_{l} } \right)\) :
-
Bubble production rate
- C D :
-
Drag coefficient
- C k :
-
Concentration of component k (mole/m3)
- \(C_{{O_{2} }}\) :
-
Oxygen level in cell medium (g/m3)
- d :
-
Diameter (m)
- d b :
-
Maximum horizontal bubble dimension
- d 32 :
-
Sauter mean diameter
- D :
-
Diffusivity (m2/s)
- E O :
-
Eotvos number
- F C :
-
Centrifugal force (N/m3)
- F i :
-
Phase interaction force (N/m3)
- G k :
-
Production rate of turbulent energy (m2/s3)
- H :
-
Discontinuous collisional events
- \(\overline{I}\) :
-
Unit tensor
- J :
-
Transport flux of phenol (g/m2s)
- k i :
-
Turbulent kinetic energy (m2/s2)
- K I :
-
Substrate inhibition constant (g/m3)
- k L :
-
Covariance of phases velocities
- K L :
-
Volumetric mass transfer coefficient (1/h)
- K O :
-
Oxygen saturation constant (g/m3)
- K S :
-
Substrate affinity constant (g/m3)
- L :
-
Bubble size (m)
- M :
-
Molecular weight (g/mole)
- M k,l :
-
Mixed order moment of the NDF
- n :
-
Bubble size distribution
- P c (d k ,d l ):
-
Coalescence probability
- \({\mathcal{P}}\) :
-
Partitioning coefficient
- P :
-
Pressure (Pa)
- r :
-
Rate (g/m3s)
- \(\vec{r}\) :
-
Position vector (m)
- Re :
-
Reynolds number
- S cm :
-
Phenol level in cell medium (g/m3)
- S i :
-
Source term of phase i
- S org :
-
Phenol level in organic phase (g/m3)
- Sc t :
-
Turbulent Schmidt number
- T :
-
Temperature (°C)
- U :
-
Reynolds-averaged velocity (m/s)
- U dr :
-
Drift velocity
- X :
-
Cell level in cell medium (g/m3)
- Y :
-
Cell yield on phenol
- \(Y^{{\prime }}\) :
-
Cell yield on dissolved oxygen
- w kl :
-
Collision frequency
- \(\alpha\) :
-
Volume fraction
- ε :
-
Turbulent dissipation energy (m2/s3)
- \(\zeta_{j,k}\) :
-
Break-up redistribution factor
- \(\lambda\) :
-
Eddy length scale
- \(\mu\) :
-
Viscosity (Pa·s)
- \(\nu\) :
-
Bubble volume (m3)
- \(\xi_{kl}\) :
-
Coalescence redistribution factor
- \(\rho\) :
-
Density (g/m3)
- σ :
-
Surface tension (N/m)
- \(\overline{\tau }_{eff}\) :
-
Viscous stress tensor (kg/ms2)
- \(\emptyset\) :
-
Bubble composition (mole)
- \(\chi_{kl}\) :
-
Coalescence redistribution factor
- \(\psi_{c}\) :
-
Oxygen concentration in water (mole/m3)
- \(\Gamma\) :
-
Interphase mass transfer source term
- \(\Phi\) :
-
Specific cell growth rate (1/h)
- \(\Phi_{\hbox{max} }\) :
-
Maximum specific cell growth rate (1/h)
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Moradkhani, H., Anarjan Kouchehbagh, N. & Izadkhah, MS. Experimental and CFD–PBM approach coupled with a simplified dynamic analysis of mass transfer in phenol biodegradation in a three phase system of an aerated two-phase partitioning bioreactor for environmental applications. Heat Mass Transfer 53, 1073–1091 (2017). https://doi.org/10.1007/s00231-016-1876-4
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DOI: https://doi.org/10.1007/s00231-016-1876-4