Priming dynamics is one of the critical parameters in designing a capillary-driven thermal management system. We report both an experimental and simulation study of hierarchical structures with silicon pillars and silicon nanowires on the pillar surface. Liquid front velocity covered and uncovered was characterized using capillary wetting experiments and validated by numerical simulation and theoretical prediction. The water under cover moves one order of magnitude faster than the water in the uncovered case. The experimental results and the prediction are in good agreement for flow regimes in both the covered and the uncovered regions.
Chen, Hsiu-Hung, Junxiang Shi, Chung-Lung Chen
Applied Physics Letters