The Profile of liquid film on the surface of contact media with the different surface roughness provided the different kinds of flow profiles. The existence of the surface roughness in the nano scale, might cause the reduction of physicochemical resistant factor which potentially prevented the liquid film to adhere and dragged out to the surface of contact media. However, varying the kind of material used as the disk material was related to the characteristics solidity of surface roughness. This parameter dealing with determining the roughness of liquid film had not been investigated by the previous researchers. This work studies measured the thickness of liquid film at the various surface roughness by regulating its rotation speed and the depth of its contact media. Furthermore, in this study, the shape of contact media used was disc contactor. The experiment was conducted by varying the disc surface using different materials, they were novotex and acrylic. Meanwhile, the method employed to measure the thickness of film was sponge media and the surface roughness employed the Atomic Force Microscopy (AFM) roughness analysis. Finally, the research result showed that the surface roughness had an effect to the flow profile and the thickness of liquid film. Besides, it also had another dominant effect to its rotational speed, depth of immersion and geometrical dimension.
Prof. Dr. Bilal BİLGİN