RESEARCH PAPER
Suitable model for thin-layer drying of root vegetables and onion
1
Institute of Mechanical Engineering, Warsaw University of Life Sciences, Poland
Final revision date: 2019-10-29
Acceptance date: 2019-12-10
Publication date: 2020-01-15
Corresponding author
Krzysztof Górnicki
Institute of Mechanical Engineering, Warsaw University of Life Sciences, Nowoursynowska 164, 02–787, Warsaw, Poland
Institute of Mechanical Engineering, Warsaw University of Life Sciences, Nowoursynowska 164, 02–787, Warsaw, Poland
Int. Agrophys. 2020, 34(1): 79-86
KEYWORDS
TOPICS
ABSTRACT
Drying behaviour of carrot, parsley, and red beet roots and onion slices of 5 and 10 mm thickness was investigated in a convective dryer at the drying temperature of 50, 60, 70oC under natural convection conditions. The experimental drying data of vegetables slices obtained were fitted to five empirical thin-layer models: Lewis (Newton), Henderson and Pabis, Page, Modified Page, Wang and Singh. The effects of vegetable species, air drying temperature, and slice thickness on the model parameters were determined. Four statistical tools, namely, determination coefficient, root mean square error, reduced chi-square, and t-statistic method were applied to determine the fittings. The Page model with model parameters determined by summation equation and square type dependence for drying air temperature and rational one for slice thickness can be recommended as the most suitable (R2 = 0.9699, RMSE = 0.0587, χ2 = 0.0035, t-stat = 0.6739).
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