Flow in the annular film around a Taylor bubble rising through vertical columns of liquid

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2004

Autores

S. Nogueira (Autor) Outra; M. L. Riethmuller (Autor) Outra; J. B. L. M. Campos (Autor) FEUP; A. M. F. R. Pinto (Autor) FEUP

Ata de Conferência Internacional

Título: 3 th International Symposium on Two-Phase Flow Modelling and Experimentation

Páginas: 1-7

3 th International Symposium on Two-Phase Flow Modelling and Experimentation

Pisa, September 2004

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química

Outras Informações

Abstract (EN): The flow in the annular film around individual Taylor bubbles rising trough stagnant and co-current vertical columns of liquid was studied employing simultaneously particle image velocimetry (PIV) and pulsed shadowgraphy (PST). This combined allows the simultaneous determination of the bubble interface position and the velocity profiles in the liquid film. Experiments were performed with aqueous glycerol solutions in a wide range of viscosities (2x10-3 Pa.s < µ < 0.22 Pa.s), in an acrylic column of 32 mm I.D. The results show that from the nose, the liquid film accelerates and below a certain distance stabilises in velocity and in thickness, becoming a free falling film. Values for the developing length and for the film thickness are reported for the experimental studied conditions. Average velocity profiles in the fully developed region are also presented. A critical Reynolds number (based on the mean absolute velocity in the liquid film) around 400 is reported for the transition from laminar to turbulent regime.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7