Test and Research on the Multi-Layer Drying for Onion

In this paper , multi-layer (14 layers) drying for onion by a convective airflow drging test-bed was tested. The regularities of the effect of different air temperatures and airflow velocities on drying rate, average gradient of moisture content and heat consumption for onion have been obtained. The better dryipg processes were provided, and their feasibility were examined-The airflow resistances of multi-layer have been obtained.