Effects of viscosity variation on an exothermic reaction in a flow system

Butakov, A. A.; Zanin, A. M.

doi:10.1007/bf00789723

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…Simplified approaches have been proposed to take into account changes in the porous structure during the reaction, for example, the random pore model [218,219]. Changes in the flow characteristics of a polymerising mixture in a channel were studied in [220]. Similar models were used to estimate the thermal stability limits of reactors with an exponential dependence of viscosity on the temperature in [221,222].…”

Section: Filtration In Reactive Mediamentioning

confidence: 99%

Particle Agglomeration of Biomass and Plastic Waste during Their Thermochemical Fixed-Bed Conversion

Donskoy

2023

Energies

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The article provides state-of-the-art research on agglomeration processes during fixed-bed combustion and gasification of low-grade fuels such as biomass and waste (primarily plastic-containing waste). Such fuels demonstrate complex thermal behaviour: their decomposition and combustion are multistage, accompanied by phase transitions, and may lead to fixed-bed mechanical instability and the non-uniformity of air distribution over the cross-section. To clarify the role of physicochemical factors (fuel composition and properties, reactor conditions), data from different sources are compared. The review shows that the fixed-bed agglomeration regimes can, in a rough approximation, be classified by the sintering mechanism (due to the melting of the mineral part or the organic part), with the following search for each mechanism realisation conditions by comparing the fuel properties and characteristic temperatures. Attempts to theoretically describe and numerically simulate the agglomeration phenomenon as a change in the structure of a reacting dispersed medium are also considered: the main directions in which such approaches can be developed are indicated.

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Section: Filtration In Reactive Mediamentioning

confidence: 99%

Particle Agglomeration of Biomass and Plastic Waste during Their Thermochemical Fixed-Bed Conversion

Donskoy

2023

Energies

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“…Frontal polymerization has also been studied for reactors of different geometries. Tubular reactors were studied experimentally [11,12] and theoretically [8,21,33]. Cylindrical and spherical reactors were considered [3,4,35] for one-step chemical kinetics, and [9,32] for more detailed chemistry.…”

Section: Introductionmentioning

confidence: 99%

Propagation of frontal polymerization—crystallization waves

Volpert

1994

Eur. J. Appl. Math

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We consider polymerization–crystallization waves in a cylindrical reactor, in which monomer is converted to polymer in a planar front. The polymer is subsequently crystallized in a wider zone behind the front. Specifically, we study uniformly propagating polymerization–crystallization waves, and determine profiles of temperature, and concentrations of polymer and crystallized polymer, as well as the propagation velocity. A linear stability analysis of the travelling wave solutions indicates the possibility of Hopf bifurcation, which describes the transition to the experimentally observed spinning mode of propagation, in which a hot spot is observed to propagate along a helical path on the surface of the cylinder. Since conditions at the time of conversion determine the nature of the polymer produced, spiral hollows, which trace out a helical path, appear on the surface of the crystallized polymer product.

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Stationary flows in channels during similarity wave propagation of a chemical reaction with an abrupt change in viscosity

Zhizhin

Segal

1986

J Appl Mech Tech Phys

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Effects of viscosity variation on an exothermic reaction in a flow system

Cited by 6 publications

References 3 publications

Particle Agglomeration of Biomass and Plastic Waste during Their Thermochemical Fixed-Bed Conversion

Particle Agglomeration of Biomass and Plastic Waste during Their Thermochemical Fixed-Bed Conversion

Propagation of frontal polymerization—crystallization waves

Stationary flows in channels during similarity wave propagation of a chemical reaction with an abrupt change in viscosity

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