Babak pakbin - Department of Food Science and Technology, University of Tehran Karaj, Iran
Seyyed hadi razavi - Department of Food Science and Technology, University of Tehran Karaj, Iran

In this study applications of ultrasound in food drying process have investigated. High frequency ultrasonic treatment is be used in food drying process as pretreatment, intensifier treatment of process and drier. Ultrasonic waves in low frequency also can be used as a diagnostic method for measuring properties of final dried products and controlling of drying process. Ultrasonic pretreatment have direct and indirect implementations. Ultrasonic direct pretreatment assess drying process by intensifying heat and mass transfer and indirect implementations of this technology are be a part of drying system such as nozzle of spray-drier or improve freezing operation in freeze-drying system.

Ultrasound; Drying; Ultrasonic pretreatment