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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
EXPERIMENTAL STUDY OF GAS-LIQUID FLOW IN VERTICAL 180º NON-CIRCULAR RETURN BENDS
Submission Author:
Ariel Jordan Villaroel , SP
Co-Authors:
Ariel Jordan Villaroel, Renan Apolonio Marçal, Valdir Estevam, Marcelo Souza de Castro
Presenter: Ariel Jordan Villaroel
doi://10.26678/ABCM.ENCIT2020.CIT20-0662
Abstract
Gas-liquid flows are commonly present in industrial processes. Also, the presence of bends is quite common in lines through which gas and liquid phases flow. However, until now there just a few works devoted to the observed phenomena of gas-liquid flow in such configuration. One of the major problems observed in bends in the presence of combined action of gravitational, centrifugal, and buoyancy forces. The force balance tends to produce complications such as the formation of stationary elongated bubbles in the curve. Also, the phenomena of stationary bubbles are observed in the impeller of centrifugal pumps when dealing with gas-liquid flows with high gas volume fractions. Therefore, this work presents an experimental analysis of gas-liquid flows through a vertical 180° Non-circular return bends. The study was carried out in a 180º curved duct of rectangular section, made of acrylic, with a diameter of 40 x 30 mm. The rectangular cross-section facilitates image acquisition. Compressed air, tap water, and mineral oil were the working fluids. Images of the stationary bubble were collected in a wide range of experimental tests. Data on liquid film thickness, elongated bubble length, and bubble diameter at the entrance, exit, and return to the system were collected. The data might be used to improve models to predict gas-liquid flow characteristics in bends and in other equipment where the centrifugal field is important as in centrifugal pumps.
Keywords
Two-phase Flow, Gas-Liquid Flow, 180° bend, elongated bubbles, film thickness
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