A correlation for burn time of aluminum particles in the transition regime

Lynch, Patrick T.; Krier, Herman; Glumac, Nick

doi:10.1016/j.proci.2008.06.205

Cited by 109 publications

(34 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, more evidence of kinetics-controlled combustion was observed in recent experiments [15][16][17][18]. There are two factors inducing the combustion transition from diffusion-controlled to kinetics-controlled.…”

Section: Discussionmentioning

confidence: 99%

“…However, the assumption of diffusion-controlled combustion is questionable according to recent experimental results. Lynch et al [15] demonstrated that the combustion time of particles, whose diameters are less than 10 m, would be dependent on pressure and oxide mole fractions. Furthermore, if the particle diameter is of nanometer scale, the combustion becomes kinetics-controlled from diffusion-controlled [16,17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of different product phases in aluminum dust detonation modeling

Teng

Jiang

2013

Sci. China Phys. Mech. Astron.

View full text Add to dashboard Cite

Modeling aluminum (Al) dust detonation is difficult due to uncertainties in the product species and fractions. Recent experiments indicate both gaseous and solid alumina may appear in the detonation product, but only the gaseous one was considered before. To resolve this drawback, we study the effects of different product phases on the detonation parameters with the hybrid combustion model proposed recently. Numerical results demonstrate that the assumption of gaseous product induces high velocity and pressure, while the assumption of solid product induces low velocity and pressure. To clarify how close-to-experiment results have been obtained with one phase assumption, we revisit previous studies and analyze the models. The inconsistency between the product phase and heat release is found, and then one model with variable heat release dependent on the product phase is proposed. Then simulations with both the gaseous and solid products are carried out, and results reveal the necessity of establishing a relationship between the heat release and reaction products. Re s = two-phase Reynolds number t= time, s T= gas temperature, K T p =particle temperature, K u= gas velocity, m/s u p = particle velocity, m/s W i =molecular weight, g/mol x= distance, m = thermal conductivity of gas, W/(m·K) = bulk density of particle, kg/m 3  = dynamic viscosity coefficient, kg/(m·s) Teng H H, et al. Sci China-Phys Mech Astron November (2013) Vol. 56 No. 11 2179 v i = stoichiometric coefficient  = gas or particle density, kg/m 3

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of different product phases in aluminum dust detonation modeling

Teng

Jiang

2013

Sci. China Phys. Mech. Astron.

View full text Add to dashboard Cite

show abstract

“…Among several expressions reported in the literature, two trends proposed recently for micron-sized particles [21,22] were selected. A linear relation was proposed based on aerosol flame measurements in Ref.…”

Section: Particle Diameter Estimated Based On the Measured Burn Timementioning

confidence: 99%

Ignition of aluminum powders by electro-static discharge

Beloni¹,

Dreizin²

2010

Combustion and Flame

View full text Add to dashboard Cite

“…Up to now, the diffusion-controlled model [24] has been the standard choice in the combustion simulation. However, a study on Al combustion by Lynch et al [25] demonstrated that the combustion of particles with diameters less than 10 lm would be dependent on pressure and mole fraction. If the particle diameter is of nanometer scale, the combustion becomes kinetics-controlled rather than diffusion-controlled [26,27].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of one-dimensional aluminum particle–air detonation with realistic heat capacities

Teng

Jiang²

2013

Combustion and Flame

View full text Add to dashboard Cite

a b s t r a c t Aluminum (Al) particle-air detonation is very complicated because it includes multi-phase combustion phenomenon. Thus numerical simulations are often over-simplified. Here, the detonation is simulated by solving one-dimensional equations with more realistic heat capacities that vary with the dust mixture temperature. The effect on detonation parameters from the realistic heat capacities for the solid particles is investigated with a hybrid combustion model. The calculated results indicate that the detonation pressure, temperature and velocity vary significantly with changes in the heat capacity. Except for the velocity, these parameters are overestimated in numerical simulations when a constant heat capacity of the pre-shock mixtures is used. Furthermore, the realistic heat capacities have a strong effect on small diameter particles, but a weak effect on large diameter particles. Thus, when constant heat capacities are used, the combustion characteristic lengths are a function of the particle diameters with a power dependence of 1.77, whereas the power dependence decreases to 1.49 when realistic heat capacities are used. Moreover, if realistic heat capacities are applied, an ''abnormal'' strong detonation wave may appear in a dust mixture having large diameter particles. This phenomenon is consistent with the current combustion model, but it indicates that the value of heat released should also vary with the gas temperature in a fashion similar to that of the heat capacities.

show abstract

A correlation for burn time of aluminum particles in the transition regime

Cited by 109 publications

References 11 publications

Effects of different product phases in aluminum dust detonation modeling

Effects of different product phases in aluminum dust detonation modeling

Ignition of aluminum powders by electro-static discharge

Numerical simulation of one-dimensional aluminum particle–air detonation with realistic heat capacities

Contact Info

Product

Resources

About