Gas rising through a large diameter column of very viscous liquid: Flow patterns and their dynamic characteristics
| Autor: | Shara K. Mohammed, Laura Pioli, Buddhika N. Hewakandamby, Barry J. Azzopardi, Abbas Hasan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science Mechanical Engineering Bubble Flow (psychology) General Physics and Astronomy 02 engineering and technology Electrical capacitance tomography Mechanics Viscous liquid 01 natural sciences Pressure sensor Silicone oil 010305 fluids & plasmas Physics::Fluid Dynamics chemistry.chemical_compound 020303 mechanical engineering & transports Electrical conduit 0203 mechanical engineering chemistry 13. Climate action 0103 physical sciences Porosity |
| Zdroj: | International Journal of Multiphase Flow. 116:1-14 |
| ISSN: | 0301-9322 |
| Popis: | Gas-liquid flows are affected strongly by both the liquid and gas properties and the pipe diameter, which control features and the stability of flow patterns and their transitions. For this reason, empirical models describing the flow dynamics can be applied only to limited range of conditions. Experiments were carried out to study the behaviour of air passing through silicone oil (360 Pa.s) in 240 mm diameter bubble column using Electrical Capacitance Tomography and pressure transducers mounted on the wall. These experiments are aimed at reproducing expected conditions for flows including (but not limited to) crude oils, bitumen, and magmatic flows in volcanic conduits. The paper presents observation and quantification of the flow patterns present. It particularly provides the characteristics of gas-liquid slug flows such as: void fraction; Taylor bubble velocity; frequency of periodic structures; lengths of liquid slugs and Taylor bubbles. An additional flow pattern, churn flow, has been identified. The transition between slug and churn has been quantified and the mechanism causing it are elucidated with the assistance of a model for the draining of the liquid film surrounding the Taylor bubble once this has burst through the top surface of the aerated column of gas-liquid mixture. It is noted that the transition from slug to churn is gradual. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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