基于瞬态平面热源法的加热卷烟芯材热物性探究OA

[Objective]This study investigates the thermal properties(thermal conductivity,volumetric specific heat,and thermal diffusivity)of core material bulks in heated tobacco products.[Methods]A thermal property detection system,based on the transient plane source method,was developed,along with a corresponding sample preparation method specifically tailored for tobacco bulks.The influence of various detection parameters and tobacco bulk sizes were thoroughly explored.Additionally,precision experiments were conducted to evaluate the reliability of the measurement system.In-depth research was carried out to analyze the factors affecting the three thermal property indices for common tobacco bulks:rolling process tobacco sheets,cut tobacco,and paper-process tobacco sheets used in heated tobacco products.[Results](1)Heating power(15-25 mW)did not significantly affect the thermal property results,while the measurement time(80 s and 160 s)showed a significant influence.The diameter(4 cm and 6 cm)and thickness(2 cm and 3 cm)of the tobacco bulks had no significant impact on the results.The RSD(relative standard deviation)values for intra-day and inter-day precision for the three thermal property indices were all below 10%.(2)The thermal properties of the three types of tobacco bulks were influenced by packing density,moisture content,and glycerol content.Thermal conductivity and volumetric specific heat were positively correlated with packing density,moisture content,and glycerol content,while they were negatively correlated with thermal diffusivity.Under similar packing densities,moisture contents,and glycerol contents,the thermal conductivity and thermal diffusivity of paper-process tobacco sheet bulks were slightly higher than those of rolling process tobacco sheets and cut tobacco.[Conclusion]The transient plane source method can effectively detect the thermal properties of various core materials used in heated tobacco products,providing a foundational basis for further research on the thermal and mass transfer properties of tobacco.