Book contents
- Frontmatter
- Contents
- Preface
- Nomenclature
- 1 Introduction
- 2 Theory of Isolated Droplet Vaporization, Heating, and Acceleration
- 3 Multicomponent Liquid Droplets
- 4 Droplet Arrays and Groups
- 5 Spray Equations
- 6 Computational Issues
- 7 Spray Applications
- 8 Droplet Interactions with Turbulence and Vortical Structures
- 9 Droplet Behavior at Near-Critical, Transcritical, and Supercritical Conditions
- Appendix A The Field Equations
- Appendix B Droplet-Model Summary
- Appendix C Guiding Principles for Two-Continua Formulation
- References
- Subject Index
9 - Droplet Behavior at Near-Critical, Transcritical, and Supercritical Conditions
Published online by Cambridge University Press: 13 October 2009
- Frontmatter
- Contents
- Preface
- Nomenclature
- 1 Introduction
- 2 Theory of Isolated Droplet Vaporization, Heating, and Acceleration
- 3 Multicomponent Liquid Droplets
- 4 Droplet Arrays and Groups
- 5 Spray Equations
- 6 Computational Issues
- 7 Spray Applications
- 8 Droplet Interactions with Turbulence and Vortical Structures
- 9 Droplet Behavior at Near-Critical, Transcritical, and Supercritical Conditions
- Appendix A The Field Equations
- Appendix B Droplet-Model Summary
- Appendix C Guiding Principles for Two-Continua Formulation
- References
- Subject Index
Summary
High pressures and supercritical conditions in liquid-fueled diesel engines, jet engines, and liquid rocket engines present a challenge to the modelling and the fundamental understanding of the mechanisms controlling the mixing and combustion behavior of these devices. Accordingly, there has been a reemergence of investigations to provide a detailed description of the fundamental phenomena inherent in these conditions. Unresolved and controversial topics of interest include prediction of phase equilibria at high and supercritical pressures (Curtis and Farrell, 1988; Litchford and Jeng, 1990; Hsieh et al., 1991; Poplow, 1994; Delplanque and Sirignano, 1993; Yang and Lin, 1994; Delplanque and Potier, 1995; Haldenwang et al., 1996), including the choice of a proper equation of state, definition of the critical interface, importance of liquid diffusion, significance of transport property singularities in the neighborhood of the critical mixing conditions, influence of convection (including secondary atomization); d2 law behavior at supercritical conditions (Daou et al., 1995); droplet-lifetime predictions (Delplanque and Sirignano, 1993, 1994; Yang et al., 1992; Yang and Lin, 1994; Delplanque and Potier, 1995; Haldenwang et al., 1996); dense spray behavior (Delplanque and Sirignano, 1995; Jiang and Chiang, 1994a, 1994b, 1996); combustion-product condensation (Litchford and Jeng, 1990; Litchford et al., 1992; Delplanque and Sirignano, 1994; Daou et al., 1995); and flame structures at high and supercritical pressures (Daou et al., 1995). The actual combustion process is characterized by the supercritical combustion of relatively dense sprays in a highly convective environment.
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- Fluid Dynamics and Transport of Droplets and Sprays , pp. 258 - 272Publisher: Cambridge University PressPrint publication year: 1999