EXPERIMENTAL INVESTIGATION OF HIGH-FLUX TWO-PHASE IMMERSION COOLING BY USING A 3D VAPOR CHAMBER

This study experimentally investigated the nucleate boiling performance of the three-dimensional vapor chamber (3D-VC) and 3D pin fin heat sink (3D-PFHS) for two-phase immersion cooling. HFE-7100 was the working fluid, and the test was conducted at a saturation temperature of 61°C. These test samples had the same dimensions, and the only difference between these two is that one was made of a vapor chamber and heat pipe, whereas the other was solid copper. The pin fin height, diameter, and pitch are 25, 4, and 10 mm, respectively. The results revealed that the 3D-VC has higher heat transfer performance than the 3D-PFHS. At a 15°C wall superheat, the 3D-VC achieved a heat flux that is 54% higher than that of the 3D-PFHS, whereas at a wall superheat of 30°C, the derived heat flux is 60% higher than that of the 3D-PFHS. It is also found that the thermal spreading resistance dominates the total resistance, which ranges from 65% to 67% of the total thermal resistance for the present area ratio.