Effective moisture diffusivity during hot air solar drying of tomato slices
H. Samimi Akhijani, A. Arabhosseini, M.H. Kianmehrhttps://doi.org/10.17221/33/2014-RAECitation:Samimi Akhijani H., Arabhosseini A., Kianmehr M.H. (2016): Effective moisture diffusivity during hot air solar drying of tomato slices. Res. Agr. Eng., 62: 15-23.
Mathematical modelling and effective moisture diffusivity of tomato (Lycopersicon esculentum) was studied during hot air solar drying. An experimental solar dryer with a swivel collector was used for experiments. The collector followed the solar radiation using a precious sensor. Drying experiments were performed in a thin layer hot air drying at slice thicknesses of 3, 5 and 7 mm and air velocities of 0.5, 1 and 2 m/s. The experimental data were fitted to different mathematical moisture ratio models and the Page model was selected as the best model according to correlation coefficient R2, chi-square χ2 and root mean square error (RMSE) parameters. The maximum values of moisture diffusivity was 6.98 × 10–9 m2/s at air velocity of 2 m/s and slice thickness of 7 mm while the minimum value of the moisture diffusivity was 1.58 × 10–9 m2/s at air velocity of 0.5 m/s and slice thickness of 3 mm.Keywords:
falling rate period; Fick’s second law; mathematical models; solar dryer; swivel collector
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