电加热型卷烟加热和抽吸过程多物理场变化规律模拟研究

Multiphysics simulation for the heating and puffing process-es of electrically heated cigarettes

中文关键词: 电加热型卷烟  多孔介质  传热传质  关键组分  多物理场  数值模拟

英文关键词: electrically heated cigarette  porous media  heat and mass transfer  critical component  multi-physical field  numerical simulation

中文摘要:

      为揭示加热型卷烟加热和抽吸过程的传热传质和组分释放规律，基于多孔介质传热传质理论，采用烟芯段热物性随温度变化的条件以及在化学反应动力学模型中考虑了更多的烟气组分，构建了针式电加热型卷烟的三维非稳态传热传质数值模型，利用Fluent软件进行数值模拟。通过与文献中已有模型的预测值以及实验结果相比较，本模型的预测精度较文献中已有模型提高了60%以上，滤嘴出口的烟气温度与烟芯段关键烟气组分的模拟值与实验值的误差在8%以内。此外，利用该模型对某款新型电加热卷烟产品进行了数值模拟研究，发现在加热和抽吸过程中烟芯段高温区域呈周期性变化，卷烟内部的关键组分浓度分布呈先增大再减小后增大的趋势，且水分释放速率大于甘油和烟碱释放速率。本文研究结果可为加热型卷烟的烟支结构和配方设计提供重要指导。

英文摘要:

      In order to reveal the heat and mass transfer and component release laws of the heating and puffing pro-cesses of heated cigarettes, based on the theory of heat and mass transfer in porous media, a three-dimensional unsteady state heat and mass transfer numerical model of needle-type electrically heated ciga-rettes was constructed, in which the temperature-dependent thermophysical condition was adopted for the core section and more components of flue gases were considered in the chemical reaction kinetic model. Numerical simulation was carried out by using the Fluent software. By comparing with the predicted val-ues of existing models in the literature and our experimental results, the prediction accuracy of the present model was improved by more than 60%, and the errors of predicted flue gas temperature at the filter out-let and the key components of flue gas in the core section were within 8%. In addition, the model was used to numerically investigate a new type of electrically heated cigarette product. It was found that the high-temperature region of the core section changed periodically during the heating and puffing processes, the concentration distributions of the key chemical components inside the cigarette showed a tendency of increasing-decreasing-increasing, and the moisture release rate was greater than the counterparts of glycer-ol and nicotine. In summary, the present study provides an important guidance for the design of cigarette structure and formula.