Combustion of a gas suspension of metal particles

Librovich, V. B.; Lisitsyn, V. I.; Khaikin, B. I.

doi:10.1007/bf00850730

Cited by 1 publication

(3 citation statements)

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“…Usually, the role of the collective effect in formulas (1) and (2) is qualitatively and quantitatively characterized by the parameter A: for A 1, the suspension is easily ignited. At the same time, experiments and calculations have shown [2,11,12] that the value of A can vary over a very broad range -from 5-10 to 500-600 while the collective effect is exhibited. Thus, despite the deep physical meaning, in a quantitative sense the parameter A is poorly informative for the estimation of the activity (ignitability) of gas suspensions.…”

Section: Self-ignition Of Particle-gas Suspensionsmentioning

confidence: 98%

“…The indication of ignition is the loss of stability of stationary thermal regimes to small perturbations (n = 0) [2] or the disturbance of the thermal quasistationary equilibrium of the system (n 1) [11]. Analytical and numerical analyses give the following criterial relations for the ignition temperatures of the suspensions and their dependences on the parameters:…”

Section: Self-ignition Of Particle-gas Suspensionsmentioning

confidence: 99%

“…In studies [1,11,[20][21][22], which were mainly performed using the following simplifications: heterogeneous reaction, a two-temperature approximation, full mixing, uniform heating of the particles and the gas, linear or parabolic oxidation laws for the fuel particles, analytic relationships between the ignition delay of the suspension and the parameters of the disperse system. It is shown that…”

Section: Ignition Delay Of Particle-gas Suspensionsmentioning

confidence: 99%

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The ignition and combustion of dust-gas suspensions are considered. It is shown that the ability of these systems to accumulate heat is determined not only by their kinetic and thermal properties but also by the relation between their reaction surface and the heat-removal surface (f ). Experimental information on flame temperatures, ignition delays, and flame propagation over gas suspensions is processed using the parameter f , and the postulate on the stimulating role of the developed reaction surface in activating these processes is validated. It is shown that during overall burning, diffusion combustion of particles occurs only for rather small values of f . The ambiguous effect of the parameter f on the ignition and combustion processes leads to the necessity of optimizing the fuel size distribution and concentration for the effective operation of the power devices. The role of the macroparameters of two-phase flames of refractory metals in the synthesis of combustion nanoproducts is analyzed.

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Section: Self-ignition Of Particle-gas Suspensionsmentioning

confidence: 98%

Section: Self-ignition Of Particle-gas Suspensionsmentioning

confidence: 99%