This study is concerned with the deformation behaviors of two droplets impinging successively onto a solid. Photographic means is used to understand the physics of the interaction phenomena between the two droplets. Water droplets of diameters between 0.39 mm and 0.65 mm with impact velocities ranging from 2.0 to 5.0 m/s are examined. The temperature of the solid surface is set at 25, 300 and 500°C. The effects of varying solid surface temperatures, impact velocities of droplets and time intervals between the successive discharges on the collision behavior of the two impinging droplets are studied. Copyright © 2004 by ASME.