加热卷烟逐口抽吸过程传热数值模型

A numerical heat transfer model for puff-by-puff smoking of heated tobacco product

为实现加热卷烟数字化设计及烟气调控,对加热卷烟抽吸过程的传热机理进行深入研究,建立了基于多孔介质的气流流动模型与气固两相局部热平衡传热模型,模拟了加热卷烟在抽吸过程中的温度分布,并通过温度检测实验验证了模型的准确性。结果表明:①两相局部热平衡传热模型能够模拟加热卷烟传热过程,卷烟各段出口温度的模拟值与实验值差异均在15℃以内;②模拟了加热卷烟内部的气流场和温度场,各段气流流速随着抽吸呈现周期性分布,抽吸时间内中空段气流流速最大且其外围基本不流动,抽吸周期内加热卷烟烟支温度呈现D型分布;③计算了烟支加热片与烟支外周在抽吸过程中的最大热通量和最小热通量,加热片在1个抽吸周期内大约释放39 J的热量;烟支外周在1个抽吸周期内大约散失33 J的热量。

To digitally design heated tobacco products and to regulate aerosol formation,it is necessary to conduct an in-depth research on the heat transfer mechanism during the smoking process.A combined porous medium gas flow model and a gas-solid two-phase heat transfer model were established,and the temperature distribution in a model heated tobacco product was simulated for its puff-by-puff smoke formation.The accuracy of the model was verified by temperature measurement experiments.The results showed that:1)The heat transfer model of the two-phase local heat balance could simulate the heat transfer processes of heated tobacco rod,and the difference between the simulated and tested temperatures of each section of the heated tobacco product was below 15°C.2)The air flow field and the temperature field inside the heated tobacco product were simulated,the flow velocity of each section presented the periodicity distribution with each puffing,the flow velocity of the cavity section was the largest during puffing and there was basically no flow velocity around its periphery.The temperature of the tobacco rod presented a D-shaped distribution during a puffing period.3)The maximum and the minimum heat fluxes of the heater and the tobacco rod periphery of the heated tobacco product were calculated,the heat release from the heater was about 39 J in a 2-s puffing period,and the heat loss around the tobacco rod periphery was about 33 J in a 2-s puffing period.