Modeling of the Free-Surface Vortex-Driven Bubble Entrainment into Water
Abstract
:1. Introduction
2. Model Description
2.1. The GENTOP Concept
2.2. The New Entrainment Model
2.3. The Turbulence Model
3. CFD Set-Up
4. Results and Discussion
4.1. The Influence of the Turbulence Model
4.2. The Influence of Entrained Bubble Size Distribution
4.3. The Influence of the Entrainment Coefficient
4.4. The Influence of the Computational Cell Size
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Nomenclature
Latin symbols | |
interfacial area density (m−1) | |
drag coefficient (dimensionless) | |
entrainment coefficient (m s−1) | |
lift coefficient (dimensionless) | |
scaling coefficient of curvature correction (dimensionless) | |
virtual mass coefficient (dimensionless) | |
wall force coefficient (dimensionless) | |
shear-induced turbulence coefficient (dimensionless) | |
D | pipe diameter (m) |
bubble diameter (m) | |
maximum horizontal dimension of a bubble (m) | |
Eötvös number (dimensionless) | |
modified Eötvös number (dimensionless) | |
force (N m−3) | |
gravitational acceleration (m2 s−2) | |
momentum transfer term (kg m−2 s−2) | |
pressure (Pa) | |
Reynolds number (dimensionless) | |
momentum source due to external body forces (kg m−2 s−2) | |
mean velocity magnitude (m s−1) | |
velocity vector (m s−1) | |
time (s) | |
y | distance to the wall (m) |
axial distance (m) | |
Greek symbols | |
volume fraction (dimensionless) | |
characteristic cell length scale (m) | |
dynamic viscosity (Pa s) | |
density (kg m−3) | |
surface tension (N m−1) | |
turbulent Schmidt number (dimensionless) | |
blending function (dimensionless) | |
Subscripts and superscripts | |
free surface | |
phase index | |
gas | |
liquid | |
virtual mass | |
wall |
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Force | Formulation | Ref. | No. |
---|---|---|---|
Drag | [53] | (5) | |
, | (6) | ||
, , | |||
Lift | [54] | (7) | |
[55] | (8) | ||
(9) | |||
(10) | |||
[56] | (11) | ||
Wall lubrication | [57] | (12) | |
[58] | (13) | ||
[59] | (14) | ||
Turbulent dispersion | [60] | (15) | |
[49] | (16) | ||
Virtual mass | [61,62,63] | (17) | |
(18) |
Velocity Groups | dg | cg | |||
---|---|---|---|---|---|
Morphology | Polydispersed | Continuous | |||
Bubble classes | G1 | G2 | G3 | G4 | G5 |
Diameter [mm] | 1 | 3 | 5 | 7 | ≥9 |
Entrainment fraction (Sim. A) | 1 | 0 | 0 | 0 | −1 |
Entrainment fraction (Sim. B) | 0.50 | 0.50 | 0 | 0 | −1 |
Entrainment fraction (Sim. C) | 0.25 | 0.25 | 0.25 | 0.25 | −1 |
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Putra, R.A.; Lucas, D. Modeling of the Free-Surface Vortex-Driven Bubble Entrainment into Water. Water 2020, 12, 709. https://doi.org/10.3390/w12030709
Putra RA, Lucas D. Modeling of the Free-Surface Vortex-Driven Bubble Entrainment into Water. Water. 2020; 12(3):709. https://doi.org/10.3390/w12030709
Chicago/Turabian StylePutra, Ryan Anugrah, and Dirk Lucas. 2020. "Modeling of the Free-Surface Vortex-Driven Bubble Entrainment into Water" Water 12, no. 3: 709. https://doi.org/10.3390/w12030709
APA StylePutra, R. A., & Lucas, D. (2020). Modeling of the Free-Surface Vortex-Driven Bubble Entrainment into Water. Water, 12(3), 709. https://doi.org/10.3390/w12030709