Abstract:
Reducing the harm of cigarette smoke to health has been widely investigated in the cigarette industry. The burning or heating mode of tobacco has a great impact on the released harmful components. Much work has been made to develop the new heated cigarette product with the aim to decrease the amount of the harmful components from the smoke. In order to investigate the characteristics of tobacco heating by the heated cigarette product, smoke flow state and heat transfer process during the smoking mode, a three-dimensional mathematical model of porous medium for tobacco heating and smoke flow in a cigarette was established. The process of heat transfer and smoke flow were numerically simulated using computational fluid method (CFD) software (ANSYS fluent). The flied distributions of temperature, velocity and pressure during cigarette heating by the heater of heated cigarette product and smoking at a constant flow rate were obtained. The results showed that the tobacco could be effectively heated to 493.6 K by the heater for heated cigarette product with a total heat transfer coefficient of 3.4 W/(m
2·K). During smoking at a constant flow rate of 17.5 mL/s, the tobacco temperature was decreased from 394.1 K to 393.8 K with a uniform radial temperature distribution, and the smoke flow had a relatively small impact on temperature distribution of the tobacco. On the other hand, the pressure was decreased from the tobacco section to holder. These results can provide the theory guidance and fundamental data for optimizing the structure of the heated cigarette product and the heating mode of tobacco to a certain extent.