Bubbly Flows: Analysis, Modelling and Calculation

Martin Sommerfeld
Springer Science & Business Media, 08.10.2003 - 351 Seiten
The priority research ,,Analysis, Modelling and Numerical Calculations ofMul­ tiphase Flows" was running for 6 years (from 1996 to 2002) and financially sup­ ported by the Deutsche Forschungsgemeinschaft (DFG). The main objective ofthe research programme was to provide a better understanding of the physical basis for multiphase gas-liquid flows as they are found in numerous chemical and bio­ chemical reactors. The research comprised steady and unsteady multiphase flows in three frequently found reactor configurations, namely bubble columns without interiors, loop reactors, and aerated stirred vessels. For this purpose, new and im­ proved measurement techniques should be developed. From the resulting knowl­ edge and data, new and refined models for describing the underlying physical processes should result, which can be used for the establishment and improvement of analytic as well as numerical methods for predicting multiphase reactors. Thereby, the development, lay-out and scale-up ofsuch processes should be pos­ sible on a more reliable basis. For achieving this objective three research areas were defined: • development and improvement of experimental techniques which allow accu­ rate measurements in steady and unsteady multiphase flows • elaboration of new modelling approaches in order to describe the basic trans­ port processes for mass, momentum, and heat in bubbly flows • development of analytical and numerical methods supplemented by the new modelling strategies in order to support optimisation and lay-out of technical multiphase processes.

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Detailed experimental studies on gasliquid bubble flow in bubble columns with and without recycle
Basic experimental investigations on the hydrodynamics of bubble columns
Examinination of bubble collisions and coalescence in bubbly flows
PIVStudy on bubble interaction and wakes in multiphase flows
Dynamics of the Flow in Bubble Column Reactors
Improved model for the calculation of homogeneous gasliquid flows
Experimental and theoretical investigation of bubble breakup and coalescence in bubbly flows
Experimental investigation and modeling of airwater flows in vertical pipes
MultiLevel Modelling of Dispersed GasLiquid TwoPhase Flows
Analysis of bubble interactions in bidisperse bubble swarms by direct numerical simulation
Finite Element Discretization Tools for GasLiquid Flows
Flow fields in bubble columns with mass transfer
Simultaneous measurement of the local liquid and the local solid velocities
A Numerical Model of Dispersed Two Phase Flow in Aerated Stirred Vessels based on Presumed Shape Number Density Functions
Bubble dispersion in aerated stirred vessels

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