Abstract
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.
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