Book contents
- Frontmatter
- Contents
- Preface
- List of Symbols
- 1 One-dimensional analysis
- 2 Flow regimes
- 3 Film flows
- 4 Inviscid waves
- 5 Stratified flow
- 6 Influence of viscosity on large Reynolds number interfacial waves; effect of spatially and temporally induced oscillations on a turbulent flow
- 7 Large-wavelength waves; integral equations
- 8 Bubble dynamics
- 9 Horizontal slug flow
- 10 Particle dispersion and deposition
- 11 Vertical annular flow
- 12 Horizontal annular flow
- Index
- References
12 - Horizontal annular flow
Published online by Cambridge University Press: 05 November 2013
Book contents
- Frontmatter
- Contents
- Preface
- List of Symbols
- 1 One-dimensional analysis
- 2 Flow regimes
- 3 Film flows
- 4 Inviscid waves
- 5 Stratified flow
- 6 Influence of viscosity on large Reynolds number interfacial waves; effect of spatially and temporally induced oscillations on a turbulent flow
- 7 Large-wavelength waves; integral equations
- 8 Bubble dynamics
- 9 Horizontal slug flow
- 10 Particle dispersion and deposition
- 11 Vertical annular flow
- 12 Horizontal annular flow
- Index
- References
Summary
Prologue
Horizontal annular flows differ from vertical annular flows in that gravity causes asymmetric distributions of the liquid in the wall layer and of droplets in the gas flow. The understanding of this behavior is a central problem in describing this system. Because of these asymmetries, entrainment can increase much more strongly with increasing gas velocity than is found for vertical flows.
Theoretical analyses of the influence of gravity on the distribution of liquid in the wall film and on the distribution of droplets in the gas phase are reviewed. As with vertical annular flows, entrainment is considered to be a balance between the rate of atomization of the wall film and rate of deposition of droplets. Because of the asymmetric film distribution, the local rate of atomization varies around the pipe circumference. This is treated theoretically by assuming that the local rate is the same as would be observed for vertical annular flow. Gravitational settling contributes directly to deposition so that the rate of deposition is enhanced. Thus, at low gas velocities, entrainment can be much smaller for horizontal annular flows than for vertical annular flows.
- Type
- Chapter
- Information
- Physics of Gas-Liquid Flows , pp. 292 - 330Publisher: Cambridge University PressPrint publication year: 2013
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