An aerosol generator includes a housing, a heater and a mouthpiece wherein
the heater volatilizes liquid material within a flow passage and forms an
aerosol in the mouthpiece. Mixing ambient air with the vaporized liquid
material controls a droplet size of the aerosol. The ambient air can be
directed into the mouthpiece by at least one air passageway in an airflow
entrainment control member. The at least one air passageway provides a
desired volume and/or velocity of ambient air entering into the mouthpiece
thereby achieving a desired droplet size distribution of an aerosol. In an
alternative arrangement, a funnel shaped airflow entrainment control
member includes a narrow end proximate the outlet end of the flow passage.
A cone angle of the funnel-shaped member can be selected to provide a
desired volume of ambient air which mixes with the vaporized liquid
material and achieves a desired aerosol droplet size distribution.
