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Drop impingement of water and aqueous SDS solution on polycarbonates
Chia-Ying Chiang,Alvin Casandra,Wijaya Suryaputra,Shi-Yow Lin 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.49 No.-
The impact dynamics of pure water and an SDS solution at a concentration of 2.5 cmc (g = 38.9 mN/m)impinging on polycarbonate surfaces were studied. The relaxations of wetting diameter, drop height andcontact angle were examined under four impact velocities (0.451.1 m/s) with three different roughness(15114 nm). The effects of surface tension, impact velocity and surface roughness were investigated. Two new phenomena have been observed: all water drops, independent of their impact velocity, recededback to the same wetting diameter on smooth surfaces, and water drops at a low impact velocity showednearly the same wetting behavior on polycarbonates with different roughness.