Supplementary Material to &Amp;quot;simulation-Aided Characterization of a Versatile Water Condensation Particle Counter for Atmospheric Airborne Research"

Numerical simulation of three-stage water-based CPC operation Assumption 1. Water vapor through a cylindrical growth tube is described by the energy equation of a Newtonian fluid under steady laminar flow conditions.2. The particle flow is assumed to be an incompressible Newtonian fluid with a fully developed parabolic flow profile: () = 0 �1 - 2 2 � = 0 (1 - 2 ), where 0 , r, and R represent initial velocity (m/s), radial position (mm), and growth tube radius, respectively, and x is the dimensionless length.3. Axial thermal diffusion and other second-order effects such as Stefan flow are ignored. Simplified 1-D heat and mass transferThe 1-D heat transfer: a partial differential equation of steady laminar flow: ℎ is the thermal diffusivity of the air, 0.215 cm 2 /sec at STP.At the other operation conditionThe 1-D mass transfer: a partial differential equation for partial vapor pressure: is the mass diffusivity of the water vapor, 0.251 cm 2 /sec (0.21 by Steve) at STP.At the other operation condition, , = (/1()) ⁄ *