Influence of Pressure on Effective Diffusion Coefficients in Cut Tobacco Drying

In order to investigate the effects of environmental pressure and temperature on cut tobacco drying,three kinds of cut tobacco were experimented with a pressurized convective dryer.The results showed that the effective diffusion coefficients of cut tobacco increased and the moisture emission accelerated with the rising of drying gas temperature and environmental pressure.The relationship models between the effective diffusion coefficient and environmental pressure in drying process of cut tobacco originated from Chongqing,Shandong and Sichuan were established with dimensionless analysis method.The correlation coefficient between calculated values and experimented results was 0.95,which indicated that the established models characterized pretty well the kinetic characters of cut tobacco drying under pressurizing conditions.