Influence of Micro-Groove Structure on Wettability of Front Tool Surface and Parameter Optimization
Reasonable insertion of micro-groove texture on the front tool surface can improve the wettabili-ty of the tool surface.In order to explore the effects of micro-groove width,spacing and depth on the wetta-bility of tool surface,a numerical model of droplet wetting on the surface of micro-groove was established based on Wenzel theory,and the trend of apparent contact angle variation with the structural parameters of micro-groove was analyzed,and the contact angle numerical simulation was carried out by COMSOL soft-ware.The results show that the droplet wetting presents Wenzel state and Wenzel and Cassie compound state with the change of the microstructure parameters.For the microstructure parameters of Wenzel state,the apparent contact Angle decreases with the decrease of the width and spacing of the micro-groove,and decreases with the increase of the depth of the microgroove.When the slot width is 30 μm,the spacing is 40 μm,and the slot depth is 70 μm,the apparent contact angle is the smallest(54.4°),which is 22%low-er than the intrinsic contact angle.
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