Change velocity, density of grapes berries and find out how drying will be more efficient by using pilot dryer.
I took 6 trials on pilot dryer first on net tray, 2nd, 3rd, 4th and 6th on FRP tray and 5th one on MS tray.
Firstly I did blanching on grapes as a part of preprocessing using milk for the first trial and for other 5 trials I used dipping oil. Then loaded to the pilot dryer.
These trials did on different velocity and density of grape berries, all data related to it is provided in following files;
My observation is as airflow changes drying rate changes and because of oxidation the color of raisins changes.
To work on color change.