In order to explore the characteristic variation and improve the quality and efficiency during the processes of konjac drying,drying characteristics of konjac treated by air impingement drier is studied.Konjac is dried under the conditions of slice thickness(3~5 mm),air temperature(70~100 ℃) and air velocity(10~13 m/s) to obtain the drying curves, drying mate curves,the available moisture diffusion coefficient and drying activation energy.A mathematical model of air impingement drying konjac is obtained, and the whole process of dying is the falling-rate mode, The available moisture diffusion coefficient is rising with the growth of the slice thickness, air temperature and air velocity in the range of 1.232 3×10-9~2.217 8×10-9 m2/s.The drying activation energy(Ea) is calculated to be 6.601 kJ/mol according to Arrhenius formula.According to the statistical parameters such as the correlation coefficient(R2)、χ2and root mean square error(ERMS), the Henderson and Pabis model can well predict the moisture change law during konjac process by air-impingement drying.

konjac;drying;model; available moisture diffusion coefficient; activation energy;air impingement drying