Ion wind from yield corona discharge and its application to drying of Turmeric slices (Curcuma domestica Val)

Abstract

Turmeric (Curcuma domestica Val) is a native Indonesian medicinal plant. Drying sliced turmeric is an important process to get the basic herbal ingredient of a durable herb. The purpose of this study was to apply the ion wind of corona discharge to dry the turmeric slices and its characterization.The corona discharge is generated by using a pin-three of ring electrode which is subjected to a high voltage DC with positive pin electrode polarity and a negative concentric three-ring electrode. The ion will flow from the pin electrode to the three-ring electrode and a portion will be forwarded through the gap between three concentric rings. The drying of the turmeric slices is carried out at distance between electrodes which is constant. It is placed just below the concentric three-ring electrode and the distance between electrode is 2 mm. The drying of turmeric slices is time-varying 5 to 65 minutes with a time interval of 5 minutes. The study result of drying of turmeric slices is obtained drying rate and mass shrinkage is inversely proportional to a drying time. While the efficiency of drying is inversely proportional to the drying rate.