室温条件下卷烟烟丝柱中水分的扩散

I. Oh, G. Jheong
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引用次数: 1

摘要

卷烟的水分含量对卷烟的保质期、口感以及卷烟的松尾、燃速、硬度、压降等各种物理性能都有很大的影响。建立适当的数学模型来模拟卷烟中的水分扩散特性动力学,有助于生产出更好的卷烟产品。在这项工作中,已经开发了四个数学模型与适当的假设,足以分析香烟中的水分扩散动力学。本文还对所导出的模型进行了仿真。将每个模型的理论值与相应的实验数据进行比较,发现可以使用三个模型(I-II, II, III)来解释卷烟中的水分行为。利用实验值对模型进行回归分析,得到了最适合的对流传质系数和有效水分扩散系数。模型的模拟表明,烟丝柱内的水分含量没有显著的位置依赖性,因为大部分水分通过卷烟外包装径向干燥。烟叶柱内水分的干燥速率受有效水分扩散率的影响较小,而受对流传质的影响较大。为了防止卷烟在长期贮存过程中质量的恶化,改进卷烟的外包装和卷烟的气密性是非常重要的,这与卷烟的对流传质有直接的关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Diffusion of Moisture in a Cigarette Tobacco Column at Room Conditions
Abstract The moisture content of cigarettes has a significant impact on the shelf life and the taste of the products as well as various physical properties of cigarettes including loose ends, burning rate, hardness, and pressure drop. To prepare better products it would be helpful to develop proper mathematical models for the simulation of moisture diffusion characteristic dynamics in a cigarette. In this work, four mathematical models have been developed with appropriate assumptions adequate to analyze the dynamics of moisture diffusion in cigarettes. The simulation of the derived models was also carried out in this work. When the theoretical values produced from each model were compared with the corresponding experimental data, it was found that three models (I-II, II, III) can be used to explain the behavior of moisture in cigarettes. Convective mass transfer coefficients and effective moisture diffusivities that fit best were obtained by a regression analysis of the model using the experimental values. The simulation of the models revealed that there is no significant positional dependence of moisture content inside a tobacco column because most of the moisture dries out radially through the cigarette wrapper. The drying rate of moisture in a tobacco column is rarely affected by effective moisture diffusivity, but strongly influenced by convective mass transfer. To prevent quality deterioration of the cigarettes during long-term storage, it is concluded that improvement of the cigarette wrapper and air tightness of the package, which are directly related to the convective mass transfer, is very important.
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