Bubble coalescence and breakup

Interfacial transfers and phase distribution strongly depend on the local bubble size distribution, which varies spatially and temporally as a result of coalescence and breakup phenomena among others. On the basis of detailed literature reviews a phenomenological model considering all mechanisms leading to bubble coalescence and breakup is developed. It is incorporated in the HZDR baseline model and validated for a wide range of poly-disperse bubbly flows. The present version of the models can be found here.

Selected publications

• 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
• Liao, Y., et al.
  Development of a generalized coalescence and breakup closure for the inhomogeneous MUSIG model.
  Nucl. Eng. Des., 241, 1024 -1033
• Liao, Y., Lucas, D.
  A literature review on mechanisms and models of the coalescence process of fluid particles.
  Chem. Eng. Sci., 65, 2851-2864
• Liao, Y., Lucas, D.
  A literature review of theoretical models for drop and bubble breakup in turbulent dispersions.
  Chem. Eng. Sci., 64, 3389-3406
• Lucas, D., Krepper, E., Rzehak, R., Liao, Y., et al.
  Status and challenges of CFD-modelling for poly-disperse bubbly flows.
  The 16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-16), Chicago, USA, Aug. 30 –Sept. 09
• Liao, Y., Lucas, D.
  Modeling of the evolution of bubble size distribution of gas-liquid flow inside a large vertical pipe: influence of bubble coalescence and breakup models.
  Proceedings of Annual Meeting on Nuclear Technology, Berlin Congress Center, May 17 – 19
• Liao Y., et al.
  Validation of a generalized model for bubble coalescence and breakup in MUSIG approach.
  Proceedings of Annual Meeting on Nuclear Technology, Berlin Congress Center, May 4 – 6, paper 204
• Liao, Y., Lucas, D.
  Breakup and coalescence models for turbulent air-water mixtures in a vertical pipe.
  Proceedings of Annual Meeting on Nuclear Technology, Congress center Dresden, May 12 – 14, paper 219
• Liao, Y., Lucas, D.
  A new model for bubble coalescence and breakup in poly-disperse bubbly flows.
  Proceedings of the 13th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH - 13), Kanazawa City, Ishikawa Prefecture, Japan, Sept. 27 – Oct. 2, Paper N13P1124
• Liao, Y. et al.
  Development of new coalescence and breakup closures for the inhomogeneous MUSIG model.
  Proceedings of Nuclear Energy for New Europe, Bled, Slovenia, Sept. 14-17