Effect of ventilation in cooling section on aerosol release behavior from heated tobacco products

To study the effect of perforated ventilation in heated tobacco products, tobacco stick samples were prepared at four ventilation rates (0, 15%, 25% and 35%) in the cooling section. Aerosol temperature and the transfer behavior of nicotine and glycerol were analyzed. The results showed that: 1) Within 0 to 35% ventilation rates, there were linear negative correlations between the maximum and average aerosol temperatures and the ventilation rate. The aerosol temperatures of the first four puffs showed a distinct downward trend with increasing ventilation rates. 2) As the ventilation rate increased, the retention rate of nicotine in the filter section decreased non-linearly, while the residual nicotine in the tobacco section increased non-linearly. As the ventilation rate increased from 0 to 25%, the transfer rate of nicotine in aerosol showed a nonlinear increasing trend. There was a maximum fitting value for the transfer rate of nicotine in aerosol between 25% and 30% ventilation rate, then it decreased. 3) As the ventilation rate increased, the retention rate of glycerol in the filter section decreased non-linearly and that in the cooling section decreased slightly, and the residual rate of glycerol in the tobacco section and the transfer rate of glycerol in the aerosol increased non-linearly. 4) Ventilation in the cooling section could increase the transfer rates of nicotine and glycerol in the aerosol by reducing their retention rates.