Abstract The relatively stable clusters of regularly positioned small droplets formed over the locally heated water surface have been studied starting from the early paper by the first author. The life of a cluster appeared to be not long because of growing of droplets due to condensation of steam and the final coalescence of large droplets with the substrate layer of water. However, further laboratory studies of biochemical processes in single droplets will be possible only in the case of their longer life. One way to stabilize the cluster suggested recently by the authors is an external infrared heating which prevents growing of droplets. The present paper is focused on another way to stabilize the cluster. This is an expected rebuilding of droplet clusters at periodic changes in power of the heating laser beam. The frequency of these oscillations is more important than their amplitude because of the resonance nature of the phenomenon. The experiments showed that in the simplest variant of alternating constant power values with the same duration of heating, the droplet growth rate is approximately twice reduced with a power modulation period of about 0.9 s. It means that such a “rejuvenescence” procedure can be used at laboratory conditions to prolong the life of levitating droplet clusters.

中文翻译：

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使用激光加热功率的调制抑制悬浮团簇液滴的凝聚生长

摘要 从第一作者的早期论文开始，已经研究了在局部加热的水面上形成的相对稳定的规则定位小液滴簇。集群的寿命似乎不长，因为蒸汽冷凝导致水滴生长，大水滴最终与水的基底层合并。然而，只有在寿命更长的情况下，才能对单个液滴中的生化过程进行进一步的实验室研究。作者最近建议的一种稳定集群的方法是外部红外加热，以防止液滴生长。本论文的重点是另一种稳定集群的方法。这是在加热激光束功率的周期性变化下液滴簇的预期重建。由于现象的共振性质，这些振荡的频率比它们的振幅更重要。实验表明，在相同加热持续时间的交替恒定功率值的最简单变体中，液滴生长速率大约降低两倍，功率调制周期约为 0.9 秒。这意味着这种“回春”程序可以在实验室条件下使用，以延长悬浮液滴簇的寿命。