Study Of Intercept Nicotine Regulation In Cellulose Acetate Cigarette Filter And Cigarette Smoke Indoor Distribution Character

With the improvement of people’s living quality, indoor particulate matter pollution and the harm to human health is paid more and more attention. Cigarette smoke from the burning of as one of the important sources of indoor pollution,regardless of the suction by the filter into the human body or diffusion in indoor environment, will cause great harm to human body health.In order to reduce the harm of nicotine to human body during the suction, the distribution of nicotine interception and flue gas temperature in the cellulose acetate cigarette filter under ISO suction mode was simulated via the standard k-ε turbulence model 、 SIMPLE algorithm and porous medium model based on FLUENT software package. From the results, the total enthalpy of air drops gradually with time; nicotine spreads quickly and decreases gradually along the axial direction because nicotine temperature gradually decreases and nicotine moves slow down when spreading to the smoking end; nicotine has more dispersed distribution which reduce the nicotine intercept efficiency because of the fierce Brownian motion under thermophoretic force along the radial direction. Simulation intercept efficiency of cellulose acetate cigarette filter is 30.59 %, which is close to the experimental efficiency under same conditions.Intercept nicotine in cellulose acetate cigarette filter with different structure was simulated including 20 mm ordinary acetate cigarette filter 、 peripherally grooved filter(18+10 mm)、inner grooved filter(10+18 mm)、peripherally grooved filter(22+6mm)、cavity filter(18+7 mm) and cavity filter(11+6+11 mm) under same conditions,and compare the different intercept efficiencies. From the results, the grooved filter has better intercept efficiency than the ordinary cellulose acetate filter; the peripherally grooved filter has better efficiency than the inner grooved filter because nicotine passes through the non-groove section firstly in peripherally grooved filter;reducing the length of filter will reduce efficiency for the ordinary cellulose acetate filter; the cavity filter has lower efficiency because of the cavity section; the nicotine intercept efficiencies are: peripherally grooved filter(18+10 mm)>peripherally grooved filter(22+6 mm)>inner grooved filter(10+18 mm)>28 mm ordinary filter>cavity filter(18+7 mm)>cavity filter(11+6+11 mm)>20 mm ordinary filter,peripherally grooved filter(18+10 mm) has the best intercept efficiency amongcellulose acetate cigarette filter with different structure; and the results can provide theoretical basis for selection and optimal design of structure of the filter.At the same time, the regulation of cigarette smoke spread in the indoor environment was simulated. From the results, cigarette smoke from the burning spread in the indoor environment should follow the fluid flow equation、temperature diffusion equation and the flue gas diffusion equation and so on. When smoke enter the indoor environment, velocity and temperature difference of flue gas with indoor air are big. Temperature of flue gas drops rapidly and speed decreases when exchanging heat with indoor air, and diffusion range increases with smoke spreading further. It is of great significance to prevente and control environmental tobacco smoke to human body health hazard by studying the diffusion mechanism、diffusion regulation and diffusion path.