Effect of gas expansion on the velocity of a Taylor bubble: PIV measurements

• Type: Article in International Scientific Journal
• Date: 2006

Authors

Sousa, RG (Author) Other; Pinto, AMFR (Author) FEUP; Campos, JBLM (Author) FEUP

Journal

Title: International Journal of Multiphase Flow

Vol. 32 No. 10-11

Pages: 1182-1190

ISSN: 0301-9322

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 16 Citations

ISI Web of Science

Scopus - 17 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

CORDIS: Technological sciences ; Physical sciences

Other information

Authenticus ID: P-004-GVA

DOI: 10.1016/j.ijmultiphaseflow.2006.06.002

Abstract (EN): The effect of gas expansion on the velocity of a Taylor bubble was studied experimentally. The velocity field in the liquid ahead of a Taylor bubble was measured by particle image velocimetry (PIV), and the bubble velocity was measured with two pairs of laser diodes and photocells. The experiments were done in a 7.0 m long vertical tube with a 32 mm internal diameter. Solutions of carboxymethylcellulose (CMC) polymer with weight percentages between 0.01% and 0.1% were used. The expansion of slug gas induces an increase in the bubble velocity and a corresponding displacement of the liquid ahead of the bubble. The velocity of the bubble increases by an amount equal to the maximum velocity in the liquid displaced. For the solutions studied, the induced velocity profile was parabolic and the bubble velocity increase was equal to the liquid velocity at the tube axis, i.e., twice the mean velocity in the liquid displaced. The corrected velocity obtained by subtracting the velocity increase from the value of the bubble velocity is independent of the bubble length.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9