Effect of Fixed-bed Convection Drying Mode on Drying Characteristics of Litchi Fruit
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Abstract:
Effects of different fixed-bed convection drying practices including fixed position of sample layer (model I), shifting position of sample layer (model II) and shifting hot air flow direction (model III) on the drying behaviors were determined, such as hot air velocity, temperature distribution, moisture content, effective diffusion coefficient (Deff) and volume shrinkage of litchi sample layer A, B and C. Results indicated that both hot air velocity and temperature were non-uniformly distributed within different sample layer during drying. After 26 h of four stages drying, moisture contents of bulk sample of model I, II and III were 45.70%, 42.07% and 41.18% respectively. For the model I, the moisture content and Deff value in sample layer A were 29.4% and 1.48×10-6 m2/s, respectively, which was significantly different from that of sample layer B and layer C (p<0.05). For the model II and III, more uniform drying behaviors were observed. The moisture content and Deff value in sample layer A showed a little significantly difference compared to sample layer B and layer C (p>0.05). Especially for the model III, less operation procedure was achieved, which was feasibility for industrial application.
