1.2 AGGLOMERATION INSIDE THE DRYER CHAMBER
Physical modifications of droplet surface during spray drying
The process is fast(seconds).
Dryingairis cooledand humidified.
Dropsof solution/emulsion/suspension are driedthrough the surface:
-) water content (aw)decreases
-) temperatureincreases
Viscosityof drop surface increases progressively until reaching a critical viscosity ηc(107Pa*s)
=> stickysticky,able to form viscous bridges
μc is related to sticky temperatureTs and Tg