Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
ASYMMETRIC TAYLOR BUBBLE RISING AGAINST DOWNWARD FLOW
Submission Author:
Ricardo Linhares , RJ
Co-Authors:
Ricardo Linhares, Igor Braga de Paula
Presenter: Ricardo Linhares
doi://10.26678/ABCM.ENCIT2018.CIT18-0624
Abstract
The work is devoted to study the flow around a Taylor bubble rising against a downward flow. At this condition Taylor bubbles can exhibit an asymmetric behavior and a lower drag in comparison with symmetric ones. This flow condition is present in many industrial applications such as petrochemical, nuclear, refrigeration and many others. The characterization of the flow behavior is important for modelling the problem. However, no experiments regarding the flow around asymmetric Taylor bubble can be found in the literature due to radial oscillation of the bubble within the pipe. Therefore, averaged quantities are difficult to be measured. Here a different set-up arrangement is proposed to fix the radial position of the bubble. Thereby, Particle Image Velocimetry (PIV) measurements and image processing techniques could be applied. The experiments were carried out in a vertical pipe, using water as working fluid, at fully developed turbulent regime. Prior to velocity estimation, the images obtained had to be pre-processed in order to detect and to mask the bubble contour. Mean velocity fields around the bubble are measured for the first time and comparisons against numerical simulations from the literature are provided.
Keywords
Two-phase slug flow, PIV., Taylor Bubble, Counter-current
