基于CT技术的加热卷烟孔隙率特征可视化研究

Visualization and Analysis of Pore Structure Characteristics in HTP Using Computed Tomography

摘要

为探究加热卷烟（Heated Tobacco Products, HTP）烟丝段孔隙结构分布与变化，采用计算机断层（Computed Tomography，CT）扫描与三维重构技术，对比分析了加热器具插入前后的体孔隙率、截面及环形圆柱孔隙率。结果显示，HTP 孔隙分布具有显著非均质性；器具插入导致孔隙结构压缩重分布，体孔隙率降至 0.47；径向最外层孔隙率受内壁挤压，降幅达 28.81%；轴向形成挤压程度递增的复合层、中间层及上部层。仿真与实验证实，内部气流与轴向面孔隙率呈负相关，吸阻特性受孔隙率与插入模式的影响。研究揭示了 HTP 孔隙演变规律，为产品与器具的协同优化设计提供了理论支撑。

Abstract

The distribution and variability of pore space within the tobacco segment of heated tobacco products (HTP) are important factors affecting user experience and the design of heated tobacco devices. In this study, computerized tomography (CT) combined with 3D reconstruction technology was utilized to examine the pore distribution and structural changes in the tobacco segments of HTP. The research specifically analyzed volumetric porosity, cross-sectional porosity, and annular cylindrical porosity.The results revealed that the porosity distribution was significantly inhomogeneous across different HTP samples and within individual samples along various directions, both before and after device probe insertion. The mechanical insertion of the heated tobacco device induces a redistribution and compression of the pore structure, reducing the overall volumetric porosity to 0.47. In the radial direction, the outermost annular porosity is most significantly affected by the inner wall of the heated tobacco device, showing a reduction of 28.81%. In the axial direction, the structure forms three distinct regions: a composite extruded layer, an intermediate extruded layer, and an upper extruded layer. The degree of pore extrusion increases progressively within each of these layers. Furthermore, simulations and experiments confirm that the internal airflow characteristics of HTP follow an inverse relationship with the axial cross-sectional porosity distribution.The study indicates that draw resistance characteristics are influenced not only by volumetric porosity but also by the insertion mode of the heated tobacco device. These insights provide a theoretical basis and technical support for the optimal design of both HTP and the heated tobacco device.

关键词

CT 扫描 / 加热卷烟 / 孔隙率 / 多孔介质 / 可视化

Key words

CT scan / heated tobacco products / porosity / porous media / visualization

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基金资助

中国烟草总公司重大专项(110202101073（XX-18）)