ABSTRACT
The challenge of whether or not sufficient research had been done on spray drying was posed many years ago by R. E. Bahu, who noted the need for mathematical modeling to understand the complex aspects of this type of equipment. Computational Fluid Dynamics for spray drying almost inevitably involves the use of a turbulence model, since the chamber Reynolds number is usually in the turbulent regime. Solving the fundamental challenges in turbulence modeling has also eluded Nobel-prize winning physicists. While flow patterns are a basic aspect of spray dryer behavior, other basic aspects contribute to the complexity of spray drying. These other aspects involve heat and mass transfer, including basic drying kinetics, reaction engineering, particle technology, and process control. Spray dryers can be divided into two basic types, short-form and tall-form designs. The axial, radial and tangential components of the gas velocities are initially calculated by neglecting the influence of the spray.
