Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6664451 | Journal of Food Engineering | 2018 | 12 Pages |
Abstract
This work discusses the effect of pulsed electric field (PEF) parameters on the convective drying process of fresh onions. First, the PEF treatment parameters and their influence on the cell disruption were investigated by applying various PEF settings (Wâ¯=â¯0.2-20.0â¯kJ/kg, Eâ¯=â¯0.36-1.07â¯kV/cm). The diffusion coefficient De was calculated and mathematic modeling was conducted. PEF was found to enhance the internal diffusion, but not necessarily to result in an increased drying rate. The shortest drying time at a drying temperature of 60â¯Â°C was achieved for onion samples treated at 4â¯kJ/kg and 1.07â¯kV/cm. Subsequent drying trials were performed at the pre-determined PEF settings and different drying temperatures resulting in a PEF related drying time reduction of 30.3%, 21.4% and 6.4% at 45â¯Â°C, 60â¯Â°C and 75â¯Â°C to reach a residual moisture (Mr) of 7%, respectively.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
R. Ostermeier, P. Giersemehl, C. Siemer, S. Töpfl, H. Jäger,