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ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
DEVELOPMENT OF A PARTICLE TRACKING VELOCITY MEASUREMENT TECHNIQUE FOR THE STUDY OF GAS-LIQUID FLOWS WITH DIFFERENT INTERFACIAL LENGTH SCALES IN VERTICAL PIPES
Submission Author:
Emilio Paladino , SC
Co-Authors:
Rafael Franklin Lazaro de Cerqueira, Emilio Paladino, Clovis Maliska
Presenter: Emilio Paladino
doi://10.26678/ABCM.ENCIT2018.CIT18-0337
Abstract
The present work aims the development of a Particle Tracking Velocimetry (PTV) technique capable to identify and then track the motion of the different gas phase spatial structures present on gas-liquid vertical flows. Due to its transient and strong spatial variations, the vertical slug flow pattern is studied, since the gas phase is spatially distributed as dispersed small bubbles or large elongated bubbles, which are commonly referred as Taylor bubbles. The different morphologies can be classified on two groups: i) small scale interfacial scale phase, the dispersed bubbles and ii) large scale interfacial scale phase, the Taylor bubble. This morphological classification arises from the different interfacial length of the gas phase structures presented on the flow pattern. In order control the interfacial length scales and test out the proposed method, the real slug flow is simplified to a ``quasi-slug'' flow pattern, where a fabricated flow pattern is created by the injection of Taylor bubble into gas-liquid bubbly vertical flow, where it is possible to vary the Taylor bubble length and the of the bubbly flow liquid and gas superficial velocities, simulating a real slug flow pattern. The Particle Tracking Velocimetry implementations found on literature can only be used for flows with a single interfacial length scales, such as the rising of a Taylor bubble or the individual tracking of dispersed bubbles found on gas-liquid bubbly flows. The proposed method consists on two different tracking algorithms that are coupled to be used on a gas-liquid flows with different interfacial length scales, being able to track the motion of the different interfacial length scales and also extract information about its shape and size.
Keywords
Particle Tracking Velocimetry, PTV, Taylor Bubble, bubbly flow, Slug Flow
