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ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Dynamics of horizontal core-annular flow via Particle Image Velocimetry (PIV)
Submission Author:
Jorge enrique Arrollo Caballero , SP
Co-Authors:
Jorge enrique Arrollo Caballero, Pedro José Miranda Lugo, MARLON MAURICIO HERNANDEZ CELY, Oscar Mauricio Hernandez Rodriguez
Presenter: Jorge enrique Arrollo Caballero
doi://10.26678/ABCM.ENCIT2022.CIT22-0290
Abstract
The interaction of non-miscible liquids is frequently encountered in the petroleum, food and chemical industry, where applications such as transportation of heavy oil with the injection of small amounts of water are found. When those fluids flow in a pipeline, they can take different spatial configurations called flow patterns, each with different hydrodynamic characteristics. One of those configurations is the core-annular flow pattern, in which the most viscous fluid is in the pipe’s core, while the less viscous fluid forms a ring around the core and it is in contact with the pipe wall. That flow pattern is interesting because it can be used to reduce pressure losses in pipes in transport or production applications. Some theories on the hydrodynamic stability of the core-annular flow have been suggested in the literature. One of them is the lubrication model, which considers that the lubrication forces counterbalance the buoyance forces acting on the core, so that the interfacial waves are not symmetric and the interface must be wavy for the annular flow to be stable. The levitation model proposes that inertial forces on the core are responsible for the stability of the flow. Some authors state that both phenomena can coexist and promote the stability of that flow pattern. However, there is no agreement on which theory best describes the core-annular flow’s hydrodynamic stability. In order to study the dynamics of a horizontal oil-water core-annular flow, we will obtain non-intrusive instantaneous local velocity measurements of cross-sectional and lateral flow fields and turbulence statistics at the water ring via PIV and high-speed video camera. New experimental data will be collected considering different flow regimes for the oil and water phases. Regions of high shear are expected to be close to the pipe wall and at the liquid-liquid interface. One can hope that such analysis shed some light on the core-annular flow dynamics and phenomena that may promote the stabilization of the oil core.
Keywords
Core-annular flow, hydrodynamic stability, oil-water flow, PIV, Velocity profiles.
