Effect of orifice shape on bubble formation mechanism
| Autor: | A. G. Nouri, Mehdi Ashjaee, Amirmohammad Sattari, Pedram Hanafizadeh, Seyed Erfan Hosseini-Doost |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Mechanical Engineering Bubble Flow (psychology) 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Volumetric flow rate Physics::Fluid Dynamics Acceleration 020401 chemical engineering Volume (thermodynamics) Mechanics of Materials Position (vector) Liquid bubble 0204 chemical engineering 0210 nano-technology Body orifice |
| Zdroj: | Meccanica. 53:2461-2483 |
| ISSN: | 1572-9648 0025-6455 |
| DOI: | 10.1007/s11012-018-0835-1 |
| Popis: | The effect of orifice shape on the mechanism of bubble formation in gas–liquid two-phase flow is investigated experimentally with three different orifice geometries regarding a circle, a square, and a triangle with same cross-sectional areas. The liquid and gas phases are purified water at 20 °C and air at room temperature, respectively. Gas is injected at the rate of 50–1200 mlph into a stagnant pool of liquid in distances of 5, 10, and 15 cm below the liquid surface. The position, velocity, and acceleration of bubbles are measured at bubbles’ centers of mass (CM) and the effects of these parameters on the bubble volume are investigated. Moreover, the forces acting on a bubble are balanced and the effects of geometry and gas flow rate on each force are presented. In addition, the changes of the acting forces versus time are plotted and discussed for a specific condition. Results show the bubbles formed with the square and circular orifice cross-sectional areas have the most and least volumes at detachment, respectively. |
| Databáze: | OpenAIRE |
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