چكيده به لاتين
Combustion of organic particles is a complex physical and chemical process that simultaneously involves the mass and heat transfer, phase change and chemical reaction. Combustion of heterogeneous mixtures, including combustible and oxidizing particles, is used in many engineering and safety fields. Therefore, experimental and theoretical studies on this field of combustion phenomena are needed. The combustion mechanisms of two-phase mixtures that are involved with the combustion research of organic dust cloud in geometries such as counter-flow still are not fully understood. Due to the importance of the in this thesis subject, efforts have been made to improve the phenomena of particles combustion cognition are an effective step. The process in this thesis is like, that in the first and second chapters, an overview of the subject literature and former studies on this field of particles combustion and counterflow combustion are discussed. The third chapter includes non-premixed (diffusion flame) counterflow modeling with the assumption of thin asymptotic front vaporization.It is assumed that dust cloud as fuel and air as oxidizer, move toward stagnation plane from two opposed jet. It is assumed that the dust cloud as fuel, vaporize to form a gaseous fuel to oxidizer with air. In chapter four, the thermal radiation modeling has been carried out in the geometry of diffusive dust cloud counter flow. At this chapter, as the previous chapter, the conservation equation with different boundary conditions are solved, regarding to radiation heat transfer in a different region and these results are compared to without radiation results. In fifth chapter, the effect of the thermophoretic force on counterflow geometry in the combustion of organic dust cloud has been investigated analytically. It has been assumed in this chapter that vaporization occurs in a specific non asymptotic region (vaporization zone). For this purpose, the effect of different parameters is measured with solving the conservation equations in respective regions and adding the thermophoretic force effect. In the sixth chapter, a new model is presented to study the fluctuating flame behavior in the dimensionless coordinates of time-space disturbance. So that all variables are written as a general solvable solution and a small harmonic disturbance, and finally, time dependent solutions are analyzed by using the perturbation method. Finaly, in the seventh chapter, the work concluded and suggestions for future works, proposed.
