2A2-A15 液面上における液滴の保持時間の温度依存性

概要

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When liquid is dropped onto a surface of same liquid, the droplet is sometimes kept floating on the surface for a while due to the thin air film between the droplet and the surface. We find that the time during which this phenomenon is sustained depends on the temperature of the droplet and surface. In our experiment using silicon oil with temperature range of 20-150 degrees Celsius, longer lifetime of a droplet is achieved with larger temperature difference between the droplet and the surface at the moment of the droplet's landing on the surface. Time-series observation of temperature of the floating droplet reveals that it coalesces with the surface at a certain temperature difference after the difference gradually decreases. This result shows that the lifetime of a droplet is determined by the time that it takes to decrease the temperature difference to the value to coalesce.