Large Leidenfrost drops may be unstable when their diameters exceed a critical value. Through theoretical and experimental investigations, this study explored the feasibility of suppressing Leidenfrost instability in a large container, by meshing the container or its central portion into rectangular elements. Thin rods were used to construct these rectangular elements. Leidenfrost instability was considered in four rectangular configurations. They were also the rectangular mesh elements that might be used. There were two findings. First, the diameter of the largest inscribed cylinder in a rectangular configuration was the critical dimension for determining Leidenfrost instability. Second, the threshold value of this diameter in a rectangular configuration with rod(s) was 8.9λ ± 0.7λ, where λ is the capillary length of water. It was larger than its counterparts in both a rectangular container (without the presence of a rod) and a circular container (with or without the presence of a rod), due to the strong effect of the rod in a rectangular configuration. Based on these two findings, a large rectangular container was meshed into rectangular elements using thin rods, with the diameter of the largest inscribed cylinder in each element below the threshold value. This mesh method suppressed the Leidenfrost instability in the large container.

中文翻译：

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使用多杆和矩形网格单元抑制 Leidenfrost 不稳定性

当直径超过临界值时，大的 Leidenfrost 液滴可能不稳定。通过理论和实验研究，本研究探讨了通过将容器或其中心部分网格化为矩形单元来抑制大型容器中莱顿弗罗斯特不稳定性的可行性。细棒被用来构建这些矩形元素。Leidenfrost 不稳定性在四个矩形配置中被考虑。它们也是可能使用的矩形网格元素。有两个发现。首先，矩形配置中最大内切圆柱的直径是确定莱顿弗罗斯特不稳定性的关键尺寸。其次，在带有杆的矩形配置中，该直径的阈值为 8.9 λ ± 0.7 λ，其中λ是水的毛细管长度。由于矩形结构中杆的强大作用，它在矩形容器（没有杆）和圆形容器（有或没有杆）中都比其对应物大。基于这两个发现，使用细杆将一个大矩形容器网格化为矩形单元，每个单元中最大内接圆柱的直径低于阈值。这种网格方法抑制了大型容器中的 Leidenfrost 不稳定性。