Change in dielectric properties of sweet potato during microwave drying
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Sweet potato slices and strips (thickness of 6 and 9 mm, respectively) as single layer were dried at different microwave power levels (90 W to 900 W) in order to determine the effect of microwave power and sample shape on drying characteristics. Dielectric properties of sweet potato slices were measured during microwave drying. Drying time for both samples was decreased with increase in microwave power, and drying time of strips was longer than slices in the microwave power range between 90 and 720 W. Page model was suitable for describing experimental drying data regardless of microwave power and shape of sweet potato samples. Dielectric properties of sweet potato slices were decreased with a decrease in moisture content. The change in dielectric properties of sweet potato slices could be predicted by Henderson and Pabis model and could be applied to estimate the change in moisture content of sweet potato during microwave drying.
KeywordsSweet potato Microwave drying Drying models Dielectric properties
This work was carried out with the support of the “Cooperative Research Program for Agriculture Science and Technology Development (Project No. PJ10224701)” Rural Development Administration, Republic of Korea.
Compliance with ethical standards
Conflict of interest
The authors declare no conflict of interest.
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