ABSTRACT
The development of new processes involving plasma torch (electric arc heater) requires fairly often a detailed understanding of the momentum, mass and heat transfer characteristics of turbulent reactive gas-particle two-phase flows. The model, including pyrolysis of coal turbulent combustion of volatile matter and radiative transfer, is used to compute an axisymmetric injection of pulverised coal in a hot coflowing air flow. The major emphasis of this work is to investigate the influence of the particle size and the temperature of the coflowing air flow on the global rate of devolatilization in connection with experimental results. An additional operator appears in two-phase flow predictions, coming from the mass conservation equations written separately for each phase. In order to insure the maximum of compatibility between separated conservation equations, mass fraction of the dispersed phase is computed on the pressure staggered sub-grid from a transport equation solved in the conservative finite volume approach.
