Adsorption Drying Characteristics of Angelica Dahurica and Mathematical Modeling on Large Scale

The low-temperature adsorption drying characteristics of thin-layer Angelica Dahurica were evaluated in a large scale dryer. The effects of drying medium temperature, relative humidity of drying medium and wind velocity on the drying characteristics were investigated. Page model using nonlinear regression method can preferably fit the drying characteristic of Angelica Dahurica under different drying conditions The work revealed the correlation between moisture content and drying process parameters. The drying coefficient and exponent in the page model can be expressed as a function of temperature, relative humidity and wind velocity of the drying air.