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Publication Title | MEASUREMENT OF LIQUID FILM THICKNESS ON THE HYDROPHOBIC SURFACES AT THE ROTATING VERTICALLY DISC CONTACTOR

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VOL. 12, NO. 5, MARCH 2017 ISSN 1819-6608

ARPN Journal of Engineering and Applied Sciences ©2006-2017 Asian Research Publishing Network (ARPN). All rights reserved.

www.arpnjournals.com

MEASUREMENT OF LIQUID FILM THICKNESS ON THE HYDROPHOBIC SURFACES AT THE ROTATING VERTICALLY DISC CONTACTOR

Novirina Hendrasarie1, 2, Sanggar Dewanto3, Tantular Nurtono4 and Joni Hermana2 1Department of Environmental Engineering, UPN “Veteran” Jawa Timur, Indonesia 2Department of Environmental Engineering, Institut Teknologi Sepuluh Nopember, Indonesia 3Electronic Engineering Polytechnic Institute of Surabaya, Indonesia

4Department of Chemical Engineering, Institut Teknologi Sepuluh Nopember, Indonesia E-Mail: novirina@upnjatim.ac.id

ABSTRACT

Experimentally, the research on the flow of liquid film of viscous liquid on vertically rotating flat disc partially immersed in a liquid bath has been investigated and modellelled by many researchers. The difference, in this research, the liquid being used is tap water. Meanwhile, the characteristic of disk surface chosen was hydrophobic one. The reason for this choice was due to the fact that the material being used to sell for public had hydrophobic characteristics. Therefore, for the disk material, the researcher used the material from acrylic and novotex that had hydrophobic characteristics on its surface. In addition to the disk material, also investigated the influence of surface topography, by doing three variations of topography. Furthermore, this research was conducted experimentally to see the flow characteristics of liquid film at the rotating vertically disk, especially at the low rotational speed around 1-20 rpm. The other parameter affected to the thickness characteristics of liquid film dealing with the disk depth to the water surface was also considered. Finally, the research result showed that hydrophobic surface had an effect to the flow profile and its depth of liquid film. However, liquid film was not capable of sticking very well especially at the low rotational speed of 1-7.5 rpm. Besides, the thickness profile of liquid film was not always equally the same and was not capable of achieving to the top of disk when it was rotating up.

Keywords: hydrophobic surface, topographical surface, liquid film, rotating disc, fluid slip.

1. INTRODUCTION

For many applications in microfluidic technology and almost all situations in the biological domain, the behavior of interfacial water is of prime importance. The geometric constraint of a solid surface, as well as the interactions between water molecules and the substrate, lead to structural changes of water compared to its bulk properties 18. In macro, the surfaces characteristics were classified as hydrophilic and hydrophobic, depended by the contact angle made by the water droplets. The hydrophobic surface tended to caused slip of the water, meanwhile the hydrophilic surface did not. The flat surface that was classified as hydrophobic was happened when the water droplets produced the contact angle more than 90o 5, 6, 14, meanwhile in hydrophilic surface the contact angle was less than 90o 19. In 2008, Granick and Bae 10, initiated the scientific discussion to identify the characteristic of the hydrophilic surface molecule versus hydro phobic’s which purposed to characterize the hydrophobic surface, mainly for the practical application. Liquid slip seems to appear when a fluid does not wet a surface 1, 9. Because the extent of slip varies

systematically with the contact angle 12, in the case of water.

The study of liquid film that has same average flow direction with the direction activator was interesting to be discussed. If a rough surface is put in contact with a wetting liquid, the roughness may be spontaneously in vaded depending on the surface pattern and the wetting properties of the liquid. The wetting properties of the surface can be predicted and tuned by the design of a solid texture. In this paper, we analyzed the thickness and the profile of liquid film that was dragged upside by the cause of the disc rotation out of water. The material used for the disk was hydrophobic, with the material kind that has different hydrophobicity value. Moreover, the disk topography was modified with U form, where the width of mound and groove was set in particular measurement, referred to Jimenez et al., 2004 13, that explained about the flow types caused by the roughness, the roughness type D and type K, which is made by Perry et al., 1969 16 at the first time. Jimenez studied the boundary layer that was passing through rough surface area, was gained a result that the effective roughness factor depended by the roughness and the thickness of the boundary layer as it was showed at Figure-1.

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