ABSTRACT
Due to the inherent hydrodynamics of Impinging stream dryers the heat transfer rates from gas to particle depend on time as well as space. Drying occurs by combined convective and conductive heat transfer. Also, drying with simultaneous grinding can be performed if metallic beads are used as the inert particles. Drying in impinging streams is purely convective. Thus, typically both constant and falling drying rate periods can be observed if the processing materials have both internal and external resistances to mass flow. To prevent falling of the sprayed droplets onto the dryer wall, supplementary airstreams are introduced tangentially through the dryer wall. At a certain limiting ratio of the gas-to-particle terminal velocity, drying with simultaneous disintegration may actually result in drying with simultaneous agglomeration when processing some organic materials such as bone-meat extract.
