In the nano-thin film evaporation process, the hot spots may experience the local dry out phenomenon, which shows a low heat transfer performance. In present study, one stable evaporation of nano-thin water film on the substrate with different nanopillar structures was investigated using the non-equilibrium molecular dynamics (MD) approach. It shows that the nanopillar array can replenish the hot spot by attracting the surrounding water out of the overheated region, both the stability and performance of evaporative heat transfer can be improved. The effect of the number of nanopillars on the evaporation process was studied. The prediction indicates that evaporation rate is important to the replenishment. With the increasing amount of nanopillars, both the evaporative heat transfer and liquid replenishment ability are improved accordingly. The results in present work can contribute to the thermal control of the hot spot in the embedded liquid cooling technique for the high-power electronic chip.
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