摘要: To study drying characteristics of cut tobacco under radiative heat and vacuum conditions, an infrared-vacuum drying apparatus for cut tobacco was designed, and the effects of radiative heat transfer and vacuum conditions on moisture contents and temperature changes of cut tobacco during drying were investigated. The results showed that the average drying rate and final temperature of cut tobacco increased with the increasing radiation temperature, and decreased with the increasing of radiation distance. A greater vacuum degree resulted in higher drying rate and lower final sample temperature. The diffusion coefficients of middle tobacco leaves C2F were between 0.848 × 10^-10-1.597 × 10^-10 m²/s, and for upper tobacco leaves B3F the values were between 0.645 × 10^-10-1.547×10^-10 m²/s. The effect magnitude of different drying conditions on diffusion coefficient was in the order of radiation temperature > vacuum degree > radiative distance. In summary, a drying kinetics model for the infrared-vacuum drying of cut tobacco was developed, and the model performed well in predicting the impact of radiation heat transfer conditions and the vacuum degree on the effective diffusion coefficient of cut tobacco.