Cinética de secagem de grãos de soja : influência varietal

Abstract

This work aimed to adjust different mathematical models to experimental data collected in grains drying of four distinct soybeans varieties, selecting the one that best describes the drying curves. Besides that, it sought to determine the effective diffusion coefficient and the activation energy for drying of soybeans varieties analyzed. Were used early cycle soybeans varieties (NS7901RR and TMG1180RR) and medium cycle (TMG132RR and P98Y70). The grains were dried in a forced air circulation oven, at temperatures of 40, 50, 60 and 70 ºC. It was verified that, of all adjusted models, the Midilli model for NS7901RR variety, and the Two Terms, Midilli and Page models for TMG1180RR variety, were those that better described the drying curves for these varieties. For TMG132RR and P98Y70 varieties, diffusion Approximation, Two Terms and Midilli models were recommended to describe the drying curves, to present a satisfactory adjustment for all tested drying conditions. The values of effective diffusion coefficients of all varieties increased with the elevation of drying air temperature, being the biggest difference for this coefficient was observed when varieties were compared according to their reproductive cycle (early and medium). This observation was also relevant to the activation energy, however, the greatest magnitude, generally, were observed in drying of early cycle varieties.