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In this article, the fluid dynamics of room temperature liquid metal (RTLM)droplet impacting onto a pool of the same liquid in ambient air wasinvestigated. A series of experiments were conducted in order to disclose theinfluence of the oxidation effect on the impact dynamics. The droplet shape andimpact phenomenology were recorded with the aid of a high-speed digital camera.The impact energy stored in the splash structures was estimated via atheoretical model and several morphological parameters obtained frominstantaneous images of the splash. It was observed that the droplet shape andthe splashing morphology of RTLM were drastically different from those ofwater, so was the impact dynamics between room temperature LM pool and hightemperature LM pool. The energy analysis disclosed that the height of the jetis highly sensitive to the viscosity of the fluid, which is subjected to theoxidation effect and temperature effect simultaneously, and thus perfectlyexplained the phenomena. These basic findings are important for the applicationof RTLM in a series of newly emerging technologies such as liquid metal basedspray cooling, ink-jet printed electronics, interface material painting andcoating, metallurgy, and 3D packages, etc.

Splashing phenomena of room temperature liquid metal droplet striking on the pool of the same liquid under ambient air environment