Abstract
The drying properties of rapeseed, Brassica napus have been investigated for the double low variety, Ariana. The experiments were performed using a thin layer technique for air temperatures of 40, 50, 60 and 70°C and initial seed moisture contents of 12-5, 17, 21·5 and 26% d.b. The humidity was controlled by saturating the air at 13·8°C for each experiment giving a range of 5-23% relative humidity. A model based on diffusion in a sphere described the thin layer drying data most effectively giving a root mean square error of 0·306% d.b. based on all data points. The diffusivity was related to seed temperature by an Arrhenius relationship. A simpler Newtonian drying model was also fitted to the data. This was less accurate giving a root mean square error of 1·34% d.b. based on all data points.
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