As the Critical Heat Flux (CHF) condition is approached, a thin layer of vapor begins to form between the heated surface and the liquid. The mechanisms leading to the formation of this interface are not clearly understood. The present investigation focuses on obtaining high-speed video images of the liquid-vapor interface and the solid-liquid-vapor contact line. The movement of the interface and the contact line is expected to provide information regarding conditions existing just prior to reaching the CHF.

The experimental setup consists of a droplet impinging on a heated surface in a controlled environment. Two high-speed cameras capable of capturing up to 8000 frames per second are employed to obtain two views of the droplet. The accompanying software is used to determine the velocity and other relevant information regarding the interface. The results are used to discuss the applicability of the CHF and transition boiling models available in literature.

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