Study of adhesion and friction drag on a rough hydrophobic surface: Sandblasted aluminum

Roughness is a crucial prerequisite for fabricating superhydrophobic surfaces. However, the enormous economic cost of fabricating rough surfaces seriously limits the industrial application of superhydrophobic surfaces. To overcome this drawback, we present herein a simple, low cost, user-friendly, a...

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Bibliographic Details
Published in:Physics of fluids (1994) 2018-07, Vol.30 (7)
Main Authors: Li, Longyang, Zhu, Jingfang, Zhi, Shudi, Liu, Eryong, Wang, Gang, Zeng, Zhixiang, Zhao, Wenjie, Xue, Qunji
Format: Article
Language:English
Subjects:
Aluminum
Contact angle
Contact pressure
Drag reduction
Fluid dynamics
Friction drag
Hydrophobic surfaces
Hydrophobicity
Industrial applications
Physics
Polydimethylsiloxane
Roughness
Sandblasting
Slip
Slip velocity
Surface energy
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Summary:Roughness is a crucial prerequisite for fabricating superhydrophobic surfaces. However, the enormous economic cost of fabricating rough surfaces seriously limits the industrial application of superhydrophobic surfaces. To overcome this drawback, we present herein a simple, low cost, user-friendly, and rapid method to fabricate rough surfaces with micro- and nanostructured features. By modifying the sandblasting pressure, we fabricated aluminum surfaces of varying roughness, which we then decorated with polydimethylsiloxane to reduce the surface energy. The contact angle, slip velocity, slip length, and drag-reduction ratio all increase with increasing sandblasting pressure, and the maximum contact angle of a droplet, the slip velocity, the length, and the drag-reduction ratio are 151.74 ± 1°, 0.1617 m/s, 0.04276 mm, and 19.2%, respectively, for a sandblasting pressure of 0.8 MPa. The adhesive force of the samples decreases with increasing sandblasting pressure to a minimum of 0.096 mN. The process by which trapped air escapes from the sample surface is visualized by using fluent software, and the results show that the low adhesive and low friction properties of the superhydrophobic surface, which are due to air being trapped in the space between protrusions, may effectively prevent water from moving into these spaces.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.5039712