Critical autoignition conditions for a system of particles

Rumanov, É. N.; Khaikin, B. I.

doi:10.1007/bf00757464

Cited by 25 publications

(16 citation statements)

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“…2 In this connection, it is reasonable to analyze the role of the reaction surface of disperse heterogeneous fuels in their ignition and combustion, and the present study is an attempt to do this using dust-gas suspensions as an example. In addition to literature data, we use experimental and theoretical results obtained in our work and that of our colleagues for gaseous suspensions of various dust metals and coals.…”

Section: Institute Of Combustion and Nonconventionalmentioning

confidence: 99%

“…For ignition, this is indeed so provided that: 1) the fuel particles are large enough (d p > 1 µm), their burnout at the preignition stage is insignificant; 2) there is enough oxidizer in the ambient medium. Otherwise, to ignite the system, it is necessary to increase the initial temperature of the medium [2]. At the same time, increasing the reaction surface during combustion can lead to the opposite effect -premature extinction of the system.…”

Section: Institute Of Combustion and Nonconventionalmentioning

confidence: 99%

“…Extensive research directed toward solving the indicated problems [1][2][3][4][5][6] revealed the main physicochemical trends in the ignition and combustion of gaseous suspensions and the parameters influencing these processes. The main of these parameters are the oxidizer temperature and composition and the fuel size distribu- 1 …”

Section: Introductionmentioning

confidence: 99%

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Ignition and Combustion of Dust-Gas Suspensions

Zolotko

Vovchuk

Шевчук

et al. 2005

Combust Explos Shock Waves

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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: Institute Of Combustion and Nonconventionalmentioning

confidence: 99%

Section: Institute Of Combustion and Nonconventionalmentioning

confidence: 99%

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Ignition and Combustion of Dust-Gas Suspensions

Zolotko

Vovchuk

Шевчук

et al. 2005

Combust Explos Shock Waves

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“…There is a big physical literature devoted to heat explosion in heterogeneous media (see for example [1,2,6,8,11]). In this paper we study one of the models which describes heat explosion in a non-moving heterogeneous medium consisting of reacting particles surrounded by a gas.…”

Section: Introductionmentioning

confidence: 99%

“…The basic question in the theory of heat explosion is to find critical conditions of existence of solutions depending on parameters of the problem and, in particular, on the size of the domain. Heat explosion in a two-phase medium is considered in [6,11] in the case where the gas temperature does not depend on the spatial variable. One dimensional spatial case for a particular form of the non-linearity F (u) = exp(u) is studied numerically in [2].…”

Section: Introductionmentioning

confidence: 99%

existence of solutions for an elliptic-algebraic system describing heat explosion in a two-phase medium

2000

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Abstract. The paper is devoted to analysis of an elliptic-algebraic system of equations describing heat explosion in a two phase medium filling a star-shaped domain. Three types of solutions are found: classical, critical and multivalued. Regularity of solutions is studied as well as their behavior depending on the size of the domain and on the coefficient of heat exchange between the two phases. Critical conditions of existence of solutions are found for arbitrary positive source function.Mathematics Subject Classification. 36J70, 80A20.

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