Adiabatic bubbly flow
The HZDR baseline model for poly-disperse bubbly flows was validated for many cases without mass and heat transfer.
The tables below provide an overview over the configurations considered for validation so far.
Without mass and heat transfer
Configuration | Geometry | Working media |
Upward pipe flow | DN25~200 mm | Air - water |
Downward pipe flow | DN50 mm | Air - water |
Slightly inclined pipe flow | DN50 mm | Air - water |
Vertical pipe with obstacles | DN200 mm | Air - water |
Horizontal pipe flow | DN50 mm | Air - water |
Bubble column with homogeneous flow | Rectangular cylindrical |
Air - water |
Bubble column with oscillating plume | Rectangular | Air-water Argon - GaInSn |
Airlift | Rectangular cylindrical |
Air-water |
Static mixer | DN80 mm | Air - water |
Stirred tank | DN~200 mm | Air - water |
With phase change
Condensing pipe flow | DN~200 mm | Steam - water |
Evaporating pipe flow | DN~200 mm | Steam - water |
Sub-cooled wall boiling | 5×5 Bundle DN19.2 mm |
Steam - water Refrigerant R12 |
With mass transfer
bubble column | Rectangular | CO2 - NaOH solution |
bubble column | cylindrical | Air/CO2 - water |
Examples
Some examples, links and publications related to the validation are shown below.
Links
- Dedicated experiments for the development and validation of closures
- Polydisperse flows in vertical pipes
- Condensing pipe flow
- Flash boiling flow
- Wall-boiling flow and critical heat flux
- Bubbly flow with chemical reaction
- Three phase flows
- Liquid metal flows
Selected publications
- Rzehak, R.; Krauß, M.; Kováts, P.; Zähringer, K.
Fluid dynamics in a bubble column: New experiments and simulations.
International Journal of Multiphase Flow 89, 299-312 - Liao, J.; Ziegenhein, T.; Rzehak, R.
Bubbly flow in an airlift column: a CFD study.
Journal of Chemical Technology & Biotechnology 91, 2904-2915 - Liao, Y.; Ma, T.; Liu, L.; Ziegenhein, T.; Krepper, E.; Lucas, D.
Eulerian modeling of turbulent bubbly flow based on a baseline closure concept.
The 17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-17), Sept. 3-8, 2017, Xi’an, Shaanxi, China - Rzehak, R.; Ziegenhein, T.; Kriebitzsch, S.; Krepper, E.; Lucas, D.
Unified Modeling of Bubbly Flows in Pipes, Bubble Columns, and airlift columns.
Chemical Engineering Science 157, 147-158 - Ziegenhein, T.; Rzehak, R.; Ma, T.; Lucas, D.
Towards a unified approach for modelling uniform and non-uniform bubbly flows.
Canadian Journal of Chemical Engineering 95, 170-179 - Krepper, E.; Lucas, D.; Rzehak, R.
CFD modelling of downward two phase pipe flow.
9th International Conference on Multiphase Flow, 22.-27. 05. 2016, Florenz, Italien - Kriebitzsch, S.; Rzehak, R.
Baseline model for bubbly flows: Simulation of monodisperse flow in pipes of different diameters.
Fluids 1, 29 - Rzehak, R.; Ziegenhein, T.; Liao, Y.; Kriebitzsch, S.; Krepper, E.; Lucas, D.
Baseline model for simulation of bubbly flows.
Chemical Engineering & Technology 38, 1972 - Rzehak, R.; Krepper, E.
Bubbly flows with fixed polydispersity: validation of a baseline closure model.
Nuclear Engineering and Design 287, 108-118 - Liao, Y.; Rzehak, R.; Lucas, D.; Krepper, E.
Baseline Closure Model for Dispersed bubbly flow: Bubble Coalescence and Breakup.
Chemical Engineering Science 122, 336-349