Three-dimensional shape control mechanism of frozen nanofluid droplets
In order to achieve the shape control of droplets in three-dimensional space,wettability heterogeneous surfaces with a triangle pattern were prepared,the variation pattern between the droplet height and the shape of the solidified platform was obtained by fixing the contact line and observing the solidification process of nanofluid on the cryostat,the morphology of droplets on complex constrained surfaces was also simulated by Surface Evolver.The result indicates that the platform shape of the solidified nanofluid droplet fixed by the triangular contact line undergoes a sequence of triangular,circular,inverse triangular and circular shapes as the height increases.The droplets on complex constrained surfaces can be considered as spherical caps with different contact radius through the comparison between the simulated values and the experimental values.There are different sizes of plateaus for given the droplet heights,and the variations of plateau size will finally determine the shape of the final plateaus after solidification.This method allows for various shape of the solidified droplet by simply adjusting the height of the droplet,which simplifies the manufacturing process of three-dimensional structures and improves the economic efficiency profoundly.
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