Effects of filter ventilation on physical properties and temperature of aerosol in heated tobacco products.

In order to study the influence of filter ventilation of heated tobacco products on aerosol released, 1#--5# heated tobacco products samples with 0, 2, 4, 6, and 8 ventilation holes set at cavity section of filter were prepared. With an in-situ aerosol characterization method with microprobe sampling and a thermocouple temperature measurement method, the effects of ventilation on the physical properties and temperature of aerosol were investigated and analyzed. The results showed that filter ventilation changed the particle size distribution of aerosol in heated tobacco products. The particle number concentration and volume concentration of aerosol behind ventilation holes in heated tobacco products decreased with the increase of the number of ventilation holes. The reduction rate of particle volume concentration of aerosol from sample 5# was 57. 4% compared with sample 1#. Ventilation reduced the count median diameter of aerosol. However, the change of count median diameter with the number of ventilation holes was not significant. The temperature of aerosol in front of and behind ventilation holes decreased with the increase of the number of ventilation holes. The aerosol temperature of sample 5# was 23. 0 °C lower than that of sample 1#. The particle volume concentration and temperature of aerosol in front of and behind ventilation holes were higher at the central axis and lower along the radial distance. [ABSTRACT FROM AUTHOR]