Resumo

MATOS, A. de; ROSA, E. S.  e  FRANCA, F. A.. The phase distribution of upward co-current bubbly flows in a vertical square channel. J. Braz. Soc. Mech. Sci. & Eng. [online]. 2004, vol.26, n.3, pp. 308-316. ISSN 1678-5878.  http://dx.doi.org/10.1590/S1678-58782004000300007.

In this work one shows experimental data and numerical results of the void fraction distribution in vertical upward air-water bubbly flows in a square cross-section channel. To measure the void fraction distribution one used a single wire conductive probe. The averaged void fraction ranged from 3.3% to 15%; the liquid and the gas superficial velocities varied from 0.9 m/s to 3.0 m/s and 0.04 m/s to 0.5 m/s, respectively. The experimental results for the void fraction distribution were compared with numerical calculation performed by an Eulerian-Eulerian implementation of the Two-Fluid Model. In this work one performs the turbulence modeling with three approaches: using an algebraic model, the k-e two-phase model and the k-e two-phase two-layer model. Comparisons between the experimental and numerical data revealed, in general, good agreement.

Palavras-chave : Vertical upward bubbly flow; phase distribution in bubbly flows; bubbly flow in square channel.