Multi Bubble Size Class Test Solver
The Multi Bubble Size Class Test Solver is a special tool for a simplified simulation of polydisperse bubbly flows along vertical pipes. The solver resolves the variables along the radial coordinate. The main part of the programme is a balance of the lateral bubble forces in radial direction. The evolution of the flow along the pipe can be simulated within the framework of an approximation for which the differences of bubble velocities in vertical direction are neglected. The code is used for the development, investigation and validation of models for lateral bubble forces and for bubble coalescence and break-up. An extended version also allows the consideration of bubble condensation.
Comparison between calculated (red) and measured radial profiles of the gas volume fraction
D. Lucas, E. Krepper, H.-M. Prasser, Prediction of radial gas profiles in vertical pipe flow on basis of the bubble size distribution, International Journal of Thermal Sciences 40(2001)217-225
D. Lucas, E. Krepper, H.-M. Prasser, Development of bubble size distributions in vertical pipe flow by consideration of radial gas fraction profiles, 4th International Conference on Multiphase Flow, New Orleans, May 27 - June 1, 2001, Conference-CD, Paper 378
D. Lucas, E. Krepper, H.-M. Prasser, Bubble size distributions and radial profiles in vertical pipe flow, 3rd European Congress of Chemical Engineering, Nuremberg, 26 - 28 June, 2001, Conference-CD, File 532.htm, Chemie Ingenieur Technik 73 (2001) 640
D. Lucas, E. Krepper, H.-M. Prasser, Evolution of flow patterns, gas fraction profiles and bubble size distributions in gas-liquid flows in vertical tubes, Transactions of the Institute of Fluid-Flow Machinery 112(2003)37-46
D. Lucas, H.-M. Prasser, Scaling effects in vertical bubbly pipe flow, 5th International Conference on Multiphase Flow, ICMF’04, Yokohama, Japan, May 30–June 4, 2004, Paper No. 187
D. Lucas, J.-M. Shi, E. Krepper, H.-M. Prasser, Models for the forces acting on bubbles in comparison with experimental data for vertical pipe flow, 3rd International Symposium on Two-Phase Flow Modelling and Experimentation, Pisa, Italy, September 22-24, 2004, Paper ha04
E. Krepper, D. Lucas, H.-M. Prasser, On the modelling of bubbly flow in vertical pipes, Nuclear Engineering and Design 235(2005)597-611
D. Lucas, E. Krepper, H.-M. Prasser, Modeling of the evolution of bubbly flow along a large vertical pipe, The 11th International Topical Meeting on Nuclear Reactor Thermal-Hydraulics (NURETH-11), NURETH, 02.-06.10.2005, Avignon, France, Paper 051
D. Lucas, H.-M. Prasser, Simulation of condensation in a sub-cooled bubbly steam-water flow along a large vertical pipe, Archives of Thermodynamics 26(2005)49-59
D. Lucas, H.-M. Prasser, Steam bubble condensation in sub-cooled water in case of co-current vertical pipe flow, Nuclear Engineering and Design 237(2007)497-508
D. Lucas, E. Krepper, H.-M. Prasser, Modeling of the evolution of bubbly flow along a large vertical pipe, Nuclear Technology 158(2007)291-303
This work is carried out in the frame of several research projects funded by the German Federal Ministry of Economics and Technology, project numbers 150 1215, 1501265 and 150 1329.