What forces act on the droplet?
Goering et al. 1972 has listed the following forces acting on these droplets. Van del Waals force due to distortion of the charge distribution and under normal atmospheric conditions is significant only for droplets larger than a few micron (Soo 1967). Thermophoresis due to temperature gradient and under normal atmospheric conditions is significant only for submicron droplets (Soo 1967). Diffusiophoresis due to concentration gradient and under normal atmospheric conditions is significant only for submicron droplets (Soo 1967). Photophoresis due to droplet tendency to migrate when illuminated by a direct light beam and is not important as the droplets are not subjected to a direct light beam (Goering et al. 1972 Soo 1967). Basset effect due to difference in fluid and droplet density and is important only when the ambient fluid density is higher than the droplets. Air has much lower density than the droplets. Forces due to electrical and pressure gradients. Force due to electric gradient
