This paper presents the experimental investigation on shape of the meniscus in cross sections along the axial direction of open rectangular microgrooves heat sinks with input heat flux under pure evaporation heat transfer condition. The images of the shape of the meniscus in rectangular open microgrooves heat sinks were recorded by a CCD camera with the speed of 10 frames per second. Microgrooves heat sinks were placed in four inclined angles, horizon, inclined 15 degrees, inclined 25 degrees and inclined 35 degrees, and heat flux is 0.09W/cm2, 0.14 W/cm2 and 0.25 W/cm2. The results show that the shape of the meniscus is parabolic not round. When the microgrooves heat sinks are placed horizontally, the shape of the meniscus and the curvature of the meniscus in cross sections changes little along the axial direction of the microgrooves. When the microgrooves heat sinks were placed inclined 35 degrees, the meniscus moves downward to the microgroove bottom. At the same distance to the reservoir and the same heat flux, the curvature of the meniscus in inclined 35 degrees is larger than that in inclined 25 degrees, and similarly, the curvature of the meniscus in inclined 25 degrees is larger than that in inclined 15 degrees. While at the same heat flux, the microgrooves heat sink is placed in inclined 35 degrees, the curvature of the meniscus increases with the increase of the distance to the reservoir.

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