Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Design and Construction of an Experimental Apparatus for Velocity Determination of a Gas Bubble Flowing in Stagnant Liquid
Submission Author:
Luiz Eduardo Muzzo , PR , Brazil
Co-Authors:
André Vinícius Ando, Luiz Eduardo Muzzo, Luiz Eduardo Melo Lima
Presenter: Luiz Eduardo Muzzo
doi://10.26678/ABCM.COBEM2021.COB2021-0545
Abstract
Multiphase flows have been studied for many decades, due to their applications in industry sectors, such as in petroleum activities, in the nuclear energy sector, in refrigeration cycles, among other applications. This flow type occurs mainly during the transport of mixtures containing gases, liquids, and solids. It can be of the same substance (multiphase) or distinct and immiscible substances (multicomponent). The gas-liquid flows are often classified into three main patterns: dispersed, separated, and intermittent. The study of an elongated gas bubble flowing in the stagnant liquid inside pipes is of great importance for the analysis and understanding of multiphase flow models. Much of the knowledge about flow patterns have been obtained empirically, which makes evident the importance of studying and improving experimental methods related to the theme. This work aims to carry out the design and construction of an experimental apparatus for visualizing and determining the velocity of a gas bubble flowing in stagnant liquid, as seen in other works in the literature. The apparatus consists of a structure of aluminum profiles and acrylic tubes, which are fixed employing metallic clamps, as well as ball valves, among other materials. Through this apparatus, it is possible to verify the influence of the diameter and inclination of the pipe, as well as the liquid viscosity, in the ascension velocity of a gas bubble. The gas bubble velocity was determined by processing videos, recorded in the testing section of the apparatus, for two different inclinations, concerning horizontal (90° and 45°), and showed satisfactory agreement with the literature. The apparatus proves to be functional, simple to build, low cost, easy to operate, and capable of adaptations and improvements. Besides, simplified methodologies were developed for the construction and operation of the apparatus, which is functional for several applications in the experimental study of tubular flows, helping in the analysis and understanding of various flow-related phenomena.
Keywords
multiphase flow, Dimensional analysis, tubes — fluid dynamics
