Abstract

BARITTO, Miguel  and  SEGURA, Julio. Numerical study of taylor bubble rising in a vertical noncircular mini channel: Part II. Rev. Fac. Ing. UCV [online]. 2008, vol.23, n.2, pp.37-44. ISSN 0798-4065.

The mathematical model presented in first part of this study was solved for vertical mini channels with astroidal and pseudoastroidal cross-sections, in order to describe behavior of Taylor bubbles rising into these geometries. The model was solved once again by the elements based finite volumen method (EbFVM), implemented in code ANSYSR CFX.-10.0. The drift velocity trend was found to increase with the hydraulic diameter of channel, as in first part of this study. Drift velocities in pseudoastroidal geometries are higer than those in astroidal geometries. Interfacial profiles of bubbles revealed that top and bottom meniscus becomes flatter with a decrease in the channel size. How the shear stress in the diagonal direcction depends on the cross-section shape was also examined.

Keywords : Taylor bubbles; Drift velocity; Mini channels; Astroidal; Pseudoastroidal; Two-phase flow; Computational fluids dynamic (CFD); Elements based finite volumen method (EbFVM).