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The effect of liquid co-flow on gas fractions, bubble velocities and chord lengths in bubbly flows. Part II: Asymmetric flow configurations
- Source :
- International Journal of Multiphase Flow, 138
- Publication Year :
- 2021
-
Abstract
- This paper describes the effects of uniform and non-uniform liquid co-flow on the bubbly flow in a rectangular column (with two inlets) deliberately aerated unevenly. The two vertical bubbly streams, comprising uniform bubbles, started interacting downstream of the trailing edge of a splitter plate. This study quantifies the emergence of buoyancy driven flow patterns as a function of the degree of a-symmetric gas sparging and (non-)uniform liquid co-flow by using Bubble Image Velocimetry (BIV) and dual-tip optical fibre probes. Without liquid co-flow, small differences in the gas fraction of the left and right inlet had a large effect on the mixing pattern, whereas a liquid co-flow stabilized a homogeneous flow regime and the flow pattern was less sensitive to gas fraction differences. Void fractions, bubble velocities and chord lengths were measured at two fixed position in the flow channel, whereas BIV provided a global overview of the flow structures. A correlation was developed to predict (a-symmetric) operating conditions for which the gas fraction of the left and right inlet are balanced, such that the bubble motion is governed by advection and no buoyancy driven flow structures arise. The data obtained is highly valuable for CFD validation and development purposes.
- Subjects :
- Chord (geometry)
Buoyancy
Materials science
Inhomogeneous Bubble column
Splitter plate
Bubble
Flow (psychology)
Mixing (process engineering)
General Physics and Astronomy
02 engineering and technology
engineering.material
01 natural sciences
Bubble Image Velocimetry
010305 fluids & plasmas
Physics::Fluid Dynamics
CFD Validation
0203 mechanical engineering
0103 physical sciences
Trailing edge
Sparging
Fluid Flow and Transfer Processes
Mechanical Engineering
Optical fibre probe
Mechanics
Mixing pattern
020303 mechanical engineering & transports
Gas hold-up
engineering
Subjects
Details
- Language :
- English
- ISSN :
- 03019322
- Database :
- OpenAIRE
- Journal :
- International Journal of Multiphase Flow, 138
- Accession number :
- edsair.doi.dedup.....38d0b30b8edf56e86f0488380dd747a0