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Table of contents
CHAPTER 1: Dust nanoparticles – gas hybrid mixture explosions
1.1. Dust explosions
1.1.1. Explosion parameters
1.1.2. Turbulence
1.1.3. Dust dispersion characteristics
1.1.4. Radiative heat transfer
1.1.5. Particle size and shapes
1.2. Nanoparticles explosion
1.2.1. Combustion regimes of nanopowders
1.2.2. Dispersion properties of nanoparticles
1.2.3. Explosion severity
1.2.4. Ignition sensitivity
1.3. Hybrid mixture explosion
1.3.1. Ignition sensitivity
1.3.2. Explosion severity
1.4. Burning velocity
1.4.1. Laminar burning velocity
1.4.2. Flame stretch
1.4.3. Expanding spherical flames
1.4.4. Turbulent combustion
1.4.5. Laminar flame velocity measurements
1.4.6. Dust and hybrid mixture flame velocity measurements
Nomenclature
CHAPTER 2: Effect of nanoparticles dispersion on the explosion severity parameters
2.1. Introduction
2.2. Dust characterization
2.2.1. Particles properties
2.2.2. Characterization of the initial turbulence level by Particle Image Velocimetry (PIV) 63
2.3. Explosion severity parameters
2.3.1. 20L sphere test
2.4. Chemical contribution evaluation
2.4.1. Reaction product analysis
2.4.2 Effect of inert particle insertion
2.5. Radiative heat transfer contribution
2.6. Summary of the effect of different parameters
2.7. Conclusions
2.8. Conclusions (Français)
Nomenclature
References
CHAPTER 3: Study of the burning velocity of nanoparticles/methane/air hybrid mixtures
3.1. Introduction
3.2. Flame propagation study: methodology
3.2.1 Experimental set-up
3.2.2 Calculation of burning velocity of unstretched flames
3.2.3 Video analysis
3.3. Flame propagation measurements
3.3.1. Carbon black/methane/air mixtures
3.3.2. Alumina/methane/air mixtures
3.3.3 Influence of the radiative transfers
3.4. Burning velocity from severity tests
3.4.1. Thin flame propagation model
3.4.2. Burning Velocity Results
3.5. Flame detection using Schlieren Images
3.5.1 Brief description of Schlieren method
3.5.2 Schlieren images for flame velocity estimation – Brief state of art
3.5.3 Results of flame velocity tests using Schlieren set-up
3.6. Conclusions
3.7. Conclusions (Français)
Nomenclature
References
CHAPTER 4: One dimensional model of flame propagation of methane/air/dust hybrid mixture
4.1. Introduction
4.2. Model Equations and Hypotheses
4.2.1 1-D Flame System
4.2.2 Mass and Species Balance
4.2.3 Energy Balance
4.2.4 Numerical Scheme, Boundary and Initial Conditions
4.3. Results of Numerical Simulations
4.3.1. Methane/Air Flame
4.3.2. Hybrid mixture Flame
4.3.3 Hybrid mixture Flame – Contribution of the chemical reaction of the solid
4.5. Conclusions
4.6. Conclusions (Français)
Nomenclature
References
