Abstract The concave nanostructure presents a better boiling performance compared to convex one, however, the surface roughness plays a key role in thermal transport at solid-fluid interface. In this work, we adopted the non-equilibrium molecular dynamics simulation to investigate the effect of the internal surface roughness on the boiling heat transfer performance in concave nanostructure. It shows that the presence of atomic-scale roughness leads to heat transfer deterioration and enhancement during the evaporation and the explosive boiling processes, respectively. This finding, which is contradictory with the general understanding, is attributed to the difference in interfacial thermal resistance. It shows that the heat transfer performance is strongly dependent on the configuration of roughness elements. The low solid fraction configuration has a better heat transfer performance and can postpone the start of boiling process.

中文翻译：

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粗糙固-流体界面处的快速热传输：凹面纳米结构上的蒸发和爆炸沸腾

摘要 凹面纳米结构比凸面纳米结构具有更好的沸腾性能，然而，表面粗糙度在固-流体界面的热传输中起着关键作用。在这项工作中，我们采用非平衡分子动力学模拟来研究内表面粗糙度对凹面纳米结构沸腾传热性能的影响。这表明原子尺度粗糙度的存在分别导致蒸发和爆炸沸腾过程中的传热恶化和增强。这一发现与一般理解相矛盾，归因于界面热阻的差异。它表明传热性能强烈依赖于粗糙度元素的配置。