The paper investigates the fluid flow in an inclined open rectangular microgrooves heat sink using LaVision-assembled micro-PIV system. The images of the accommodation stage and the corner flow stage at inclined 15 degrees angle with heat flux of 0.09W/cm2 were recorded by a CCD camera with the speed of 10 frames per second. The velocity profile at inclined 15 degrees angle with heat flux of 0.14W/cm2 was acquired by using the analyzing software DaVis 8.1. In accommodation stage, X-Y-Z scanning table was adjusted vertically and horizontally to investigate the velocity field of different focused planes. Results show that the experimental images of the accommodation stage and the corner flow stage verify the predictions proposed by Catton and Stroes that there exist accommodation stage and corner flow stage and no jump-like stage proposed by Nilson et al. Flow in microgroove driven by capillary force is very slow and the velocity is less than 1mm per second. In evaporating thin film region, from the left side to the right side of the microgroove, the velocity increases and velocity of the interface is the highest. In lower meniscus region, the velocity increases and then decreases.

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