Dr. Roland Rzehak

Head Flotation and reactive multiphase flows
Phone: +49 351 260 3475

Dr. Dirk Lucas

Head Computational Fluid Dynamics
Phone: +49 351 260 2047

Inhomogeneous MUSIG (iMUSIG) approach

The exchange of mass, energy and momentum essentially is determined by the bubble size, which are influenced by bubble coalescence and breakup. For an adequate description of these phenomena in the framework of a population balance approach decades of bubble size groups are necessary. To limit the computational approach these were considered only in the continuity equation. For the momentum equation the size classes are assigned to only few velocity groups (see Fig. 1). This enables at least very roughly the consideration of the dependence of momentum exchange on bubble size. Separation of large and small bubbles is an essential phenomenon for the description of morphology changes (s. Fig. 2).

Selected publications

  • Rzehak, R.; Ziegenhein, T.; Liao, Y.; Kriebitzsch, S.; Krepper, E.; Lucas, D.
    Baseline model for simulation of bubbly flows.
    Chemical Engineering & Technology 38(2015), 1972
  • Rzehak, R.; Krepper, E.
    Bubbly flows with fixed polydispersity: validation of a baseline closure model.
    Nuclear Engineering and Design 287(2015), 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(2015), 336-349
  • Krepper, E.; Lucas, D.; Frank, T.; Prasser, H.-M. & Zwart, P.
    The inhomogeneous MUSIG model for the simulation of polydispersed flows
    Nuclear Engineering and Design, (2008), 238, 1690-1702
  • Krepper, E.; Lucas, D.; Prasser, H.-M.
    On the modelling of bubbly flow in vertical pipes
    Nuclear Engineering and Design, (2005), 235, 597