Analysis of developing gas/liquid two-phase flows


Analysis of developing gas/liquid two-phase flows

Tselishcheva, E. A.; Podowski, M. Z.; Antal, S. P.; Post Guillen, D.; Beyer, M.; Lucas, D.

The objective of this work has been to study the mechanisms governing flow and phase distributions in developing gas/liquid two phase flows in general, and the evolution of different size bubbles in an adiabatic vertical pipe in particular. Flow regimes from bubbly to churn-turbulent have been accounted for. The main emphasis of the work has been on the modeling of various interfacial forces between the dispersed bubbles and the continuous liquid, as well as of bubble/bubble interactions (coalescence and breakup).
The proposed modeling concept uses a complete set of transport equations for each field, such as the continuous liquid and dispersed bubble fields. The overall model has been implemented in a state-of-the-art computational multiphase fluid dynamics code, NPHASE–CMFD. This three-dimensional four-field model, including the continuous liquid field and three dispersed gas fields representing bubbles of different sizes, has been carefully tested for numerical convergence and accuracy, and then validated against the TOPFLOW experimental results.
The NPHASE-CMFD simulations were aimed at demonstrating the capability of the proposed modeling concepts to predict the evolution of bubble concentration from channel inlet to near-equilibrium (fully-developed) conditions downstream. Along with several interfacial closure laws, the effect of elevation on air density has also been included in the model.

Keywords: gas/liquid two phas flow; NPHASE-CMFD; interfacial forces; bubble/bubble interaction; coalescence; breakup; TOPFLOW

  • Contribution to proceedings
    7th International Conference on Multiphase Flow, ICMF 2010, 30.05.-04.06.2010, Tampa, USA
    Analysis of developing gas/liquid two-phase flows
  • Lecture (Conference)
    7th International Conference on Multiphase Flow, ICMF 2010, 30.05.-04.06.2010, Tampa, USA

Permalink: https://www.hzdr.de/publications/Publ-13947
Publ.-Id: 13947