Flash Dryers are used for drying of wet cakes, crystals or granular products, sticky or non-sticky in nature. These are long ducts carrying hot air at a high velocity and the material is dried while it is pneumatically conveyed along with hot air.
For lumpy materials size reduction is required to enhance the drying rate. These are ideally suited for such applications.
They are used when the material to be dried is sticky in nature, thixotropic and requires longer drying time