论文标题
光滑表面上的最低leidenfrost温度
The Minimum Leidenfrost Temperature on Smooth Surfaces
论文作者
论文摘要
在Leidenfrost效果期间，薄薄的绝缘蒸气层将蒸发的液体与热固体分离。在这里，我们证明，在温度低于地层所需的温度下，Leidenfrost蒸气层的持续得分要低得多。使用高速电气技术来测量水蒸气层的厚度，而不是光滑的金属表面，我们发现爆炸性故障点几乎与材料和流体特性无关，这表明纯粹的流体动力机制决定了这个阈值。对于几毫米的水蒸气层，稳定性的最低温度为$ \约140^{\ Circ} $ C，对应于平均蒸气层厚度为10-20 $μ$ m。
During the Leidenfrost effect, a thin insulating vapor layer separates an evaporating liquid from a hot solid. Here we demonstrate that Leidenfrost vapor layers can be sustained at much lower temperatures than those required for formation. Using a high-speed electrical technique to measure the thickness of water vapor layers over smooth, metallic surfaces, we find that the explosive failure point is nearly independent of material and fluid properties, suggesting a purely hydrodynamic mechanism determines this threshold. For water vapor layers of several millimeters in size, the minimum temperature for stability is $\approx 140^{\circ}$C, corresponding to an average vapor layer thickness of 10-20$μ$m.
