10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Femtoliter Droplet Cloud Evaporation in an Aerosol Reactor
Yuliya Khodyko, SERGEY FISENKO, Wei-Ning Wang, Luikov Institute of Heat and Mass Transfer
Abstract Number: 377 Working Group: Materials Synthesis
Abstract Results of experimental investigations and simulations of the evaporation of femtoliter water droplet cloud in a laminar flow aerosol reactor are presented. Evaporation of the droplets under atmospheric (continuum regime) and low pressure environments (free molecular regime) are considered. Evaporation of droplets of aqueous solution creates a supersaturated solution inside and it decays via formation of nanoparticles. It was shown that even for temperature wall above 1000 K and reactor length around 1 m, the droplet temperature is significantly decreased by several hundred K. In free molecular regime, the droplet evaporation is running at practically constant temperature. For evaporation in continuum regime, the evaporation rate is strongly depend on droplet radii. Micron-sized droplet practically evaporated during a several hundredths of the second. The larger droplet radius the smaller the solution supersaturation inside it. It is shown that evaporation rate is substantially lower if the number density of droplets increases. The similarity criteria of evaporation and related heat and mass transfer are developed.