壁面を滑り落ちる水滴に働く界面抵抗に水滴量が及ぼす影響

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  • Effect of Drop Volume on Interface Resistance between Sliding Water Drop and Solid Surface

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<p>The slipperiness of the droplet is important for removing the droplet from various solid surfaces. The slippery surface can be used for products and structures that require antifouling and waterproofing. In order to develop a highly slippery surface, it is necessary to predict the sliding behavior of droplets. This study focused on the relationship between the sliding behavior of water droplets on an inclined solid surface and interfacial resistance in order to investigate the behavior of water droplets after they began to slide. Water droplets of various volumes were dropped onto a solid surface and their sliding velocity, contact angle, and width of solid-liquid interface were measured. As a result, it was suggested that the water droplet accelerated at the beginning of the slide and then slide at a constant velocity. When the interface resistance at that time was calculated, it almost matched the gravity component. Furthermore, it was shown that the width of the water droplet solid-liquid interface changes with the sliding velocity. Among the factors related to interface resistance, it was found that the contact angle hysteresis was affected by the volume of water droplets and the tilt angle of the solid surface, and the width of the solid-liquid interface was affected by volume of water droplets.</p>

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