A NEW METHOD FOR STUDYING REACTION OF SOLID PARTICLES SPRAYED BY A GAS-JET ONTO A HOT SURFACE

The purpose of the present paper is to describe a sequential method fo r studying the processes controlling the rate of layer deposition obta ined by the projection of a powder conveyed by an airjet onto a hot su rface. The first results obtained in a cold flow model study provide i nformation on the hydrodynamics and settling conditions of the particl es. Experimental results are compared with a theory describing the tra jectories of the particles in wide practical domains. In a warm flow m odel, the heating conditions of the particles are then specified. A di rect theoretical study is based on the use of the previously derived h ydrodynamic model while a parallel indirect approach relies on the use of model particles of known physical and chemical properties. The goo d agreement between theory and experiments demonstrates the validity o f the method.