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
2 - Flow regimes
Published online by Cambridge University Press: 05 November 2013
- 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
Need for a phenomenological understanding
The one-dimensional analysis and the correlations for frictional pressure drop and void fraction (presented in Chapter 1) have been widely used as a starting point for engineering designs. However, these correlations have the handicap that the structure of the phase boundaries is ignored. As a consequence, they often give results which are only a rough approximation and overlook phenomena which could be of first-order importance in understanding the behavior of a system.
It is now recognized that the central issue in developing a scientific approach to gas–liquid flows is the understanding of how the phases are distributed and of how the behavior of a multiphase system is related to this structure (Hanratty et al., 2003). Of particular interest is the finding that macroscopic behavior is dependent on small-scale interactions. An example of this dependence is that the presence of small amounts of high molecular weight polymers can change an annular flow into a stratified flow by damping interfacial waves (Al-Sarkhi & Hanratty, 2001a).
- Type
- Chapter
- Information
- Physics of Gas-Liquid Flows , pp. 27 - 57Publisher: Cambridge University PressPrint publication year: 2013