Spray Dryer CFD Simulation

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The spray dryer is used to dry liquids and convert them to dry solid powders. These spray dryers are widely used in the food, pharmaceutical, ceramic, and other industries, and these dryers can deliver the final products to the desired moisture content and size. The resulting powder is removed from the chamber by separating systems such as cyclone and bag filter from hot air.
Spray Dryer Mechanism
The feed solution (slurry, paste, etc.) is first conveyed to the atomizer via a tank by means of a pump; the atomizer disperses the liquid solution as a spray or liquid droplets into the dryer main compartment. On the other hand, hot air, which rises by a burner or steam heater, blows into the chamber by a fan. At this point, the liquid phase of the spray contact with hot air, so that the moisture within the droplets evaporates within a short time, leaving the powdered dry particles with the hot air out of the chamber.

Problem Description for Spray Dryer CFD Simulation
For this simulation, we use two types of continuous and discrete phases. In fact, the hot airflow, which is responsible for evaporating the moisture contained in the solution, enters the spray dryer chamber as a continuous phase and flows into the chamber (Eulerian). While a solution containing water and solid particles (Lagrangian) injects into the chamber as a discrete phase. In fact, the main purpose of this simulation is to investigate the behavior of particles that flow as a discrete phase in a continuous flow.