Theoretical analysis on thermal conductivity of cut tobacco under different processing states

摘要

The thermal conductivity of bulk cut tobacco are the fundamental data for analysis heat and mass transfer in various conditions of tobacco processing and calculation the device working parameters. At present, thermal conductivity of cut tobacco under different processing states were studied by direct measurement and empirical equation. In this work, the thermal conductivity of cut tobacco with different bulk densities and moisture content were measured by thermal transient plane source technique. Fourier heat transfer law with three-phase mixed system modified mathematical theory model were used for studying thermal conductivity of cut tobacco under different bulk densities and moisture content. The experimental results are as follows: (1) The micro heat transfer process of cut tobacco was theoretical analysis after considering the space structure parameters of accumulation. (2) The calculated thermal conductivity of cut tobacco through Fourier heat transfer law with three-phase mixed system modified mathematical theory model results agree well with the experimental values by transient plane source method, the correlation coefficient R=0.93.(3) The predicted results could satisfy fast and accurate calculation in tobacco processing conditions; it was important for analysis the heat transfer phenomena in cut tobacco processing conditions and providing fundamental thermal conductivity data.