EXPERIMENTAL STUDY OF A MICROMETER-SIZED DROPLET IMPINGING ON A SMOOTH HEATED SURFACE

摘要

The micrometer-sized (～100 μm) droplet impinging on a surface at 46°C or 120°C was experimentally investigated for spray cooling system in nuclear plants and other high heat flux applications. Photographs were taken continuously by a high speed camera with 256×128 pixel to 300, 000 fps and a silicon surface was used as the test surface, heat source and temperature sensor. The time sequences of the droplet impingement cooling process on a surface were presented and analyzed. The effects of the droplet size and velocity were studied. The droplet spreading and evaporating on a 120°C surface with or without boiling were shown and discussed.