Effects of kinetic and transport phenomena on thermal explosion and oscillatory behaviour in a spherical reactor with mixed convection.

Thermal explosions are often influenced by the complex interaction between transport and reaction phenomena. In particular, reactant consumption can promote safer, non-explosive operation conditions of combustion systems. However, in liquids or gases, the presence of forced convection can affect the behaviour of a system, instigating oscillations in the temperature, reactant concentration and velocity fields.

Bridging the Gray and Yang, Sal'nikov and one-step, non-isothermal reaction schemes for oscillatory and explosive behaviour.

Explosions may occur as a result of thermal and branching effects in combustion processes. The aim of this work is to study the effects of chain branching and termination in a "Gray and Yang" three-step, chain-thermal reaction scheme, and the role of thermal diffusion and convection in determining the global behaviour. The response includes steady, exothermic combustion, oscillatory reaction and explosion.

Evaluation of models for the low temperature combustion of alkanes through interpretation of pressure-temperature ignition diagrams.

The purpose of this paper is to show the application of global uncertainty analysis to comprehensive and reduced kinetic models as a tool to identify important thermochemical and reaction rate parameters as determinants of the conditions leading to autoignition. Propane oxidation is taken as the test case. The simulation of experimental investigations of the cool flames and two-stage ignitions, via the pressure-temperature ignition diagram, show that existing kinetic models for the low temperature combustion of propane at sub-atmospheric pressures reflect a greater reactivity than seems to be appropriate.