Dynamics of heat transfer at the coalition of the drops on a horizontal heated surface

An experimental study was carried out to investigate heat transfer during the coalition of two drops of the same volume. The falling of a water drop to other drop sitting on a heated horizontal foil made of constantan with a thickness of 25 μm from a distance of 10 mm was recorded with a high-speed video camera. An infrared scanner was used to measure the temperature field on the surface of the foil. Measurements taken with the infrared scanner will be used to determine the heat flux density in the region of the dynamic contact wetting line at the coalition of drops.