The Effect of Ohmic Heating Pretreatment on Drying of Apple

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Kutlu N., Yilmaz M. S., Arslan H., Isci A., Sakiyan Ö.

21st International Drying Symposium (IDS), Valencia, Spain, 11 - 14 September 2018, pp.1487-1494 identifier

  • Publication Type: Conference Paper / Full Text
  • Doi Number: 10.4995/ids2018.2018.7375
  • City: Valencia
  • Country: Spain
  • Page Numbers: pp.1487-1494
  • Keywords: Ohmic heating, drying, kinetic models, thin-layer models, apple, COLOR-CHANGE KINETICS, SOLAR
  • Ankara University Affiliated: Yes

Abstract

In this study, effects of ohmic pretreatment on the drying rates and color kinetics of apple were investigated. Apple slices were treated at different electric field strengths (20-30 and 40 V/cm) at 60 degrees C for 1 min. Drying process was applied at 60 degrees C-2 m/s by using a fray-dryer. Delta E and moisture content were calculated. These values were fitted to the semi-theoretical thin-layer drying and the zero and first-order kinetic model. The shortest drying time was found samples treated with 30 V/cm. Wang&Singh model gave the superior fit to the experimental data. Delta E fitted well to the zero-order kinetic model.