Numerical simulation of smoke flow field characteristics and temperature distribution of circumferential heated tobacco products
Heated tobacco products have gradually become an important development direction and research hotspot of tobacco products because of their remarkable advantages in reducing the releases of harmful components. In order to carry out the research and development of heated tobacco products more comprehensively and systematically, an integrated development platform for heated tobacco products was constructed. On the basis of a computational fluid dynamics method, a three-dimensional numerical model for the smoke flow and heat transfer in circumferentially heated tobacco products was established. This was done by taking the heater of a circumferentially heating apparatus and dry base cigarette as the research objects. The simulation results of flow field distribution were verified by testing draw resistance and filter ventilation rate. The simulation results of temperature field distribution were verified by infrared thermometer and thermocouples. The model was used to predict the smoke flow and temperature distribution in circumferentially heated tobacco products during actual smoking. The results showed that: (1) The heat variation caused by the mass transfer of dry base cigarette in the process of heating-puffing at higher temperature was slight. (2) The temperature of different positions in the cigarette might rise or fall during puffing, depending on whether the smoke was fully heated enough at that position. (3) In the process of puffing, higher filter ventilation rate led to lower smoke flow rate passing through the tobacco section of the cigarette, which kept the internal temperature of the cigarette stable. (4) The radial temperature difference of circumferentially heated tobacco products was small. This method provides a technical support for the fast and accurate research and development of heated tobacco products.