Experimental drag reduction study of super-hydrophobic surface with dual-scale structures

Lyu, Sungnam; Nguyen, Dang; Kim, Dongseob; Hwang, Woonbong; Yoon, Bo Sung

doi:10.1016/j.apsusc.2013.09.048

Cited by 66 publications

(31 citation statements)

References 24 publications

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“…Several authors proposed superhydrophobic coating methods that reduce drag and as much as evaluation methods for the drag reduction measurements over those surfaces [14], [15], [16], [17] and [18]. The materials used to obtain the surfaces are varied, such as polymers [16], [17] and [19], sol-gel method [20] and [21] and nanostructured metals [22] and [23].…”

Section: Wenzel Equation Is Written Asmentioning

confidence: 99%

Studies of drag on the nanocomposite superhydrophobic surfaces

Brassard¹,

Sarkar²,

Perron³

2015

Applied Surface Science

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Highlights• The nanocomposite thin films of stearic acid (SA)-functionalized ZnO nanoparticles incorporated in epoxy polymer matrix have been achieved.• SA-functionalization of ZnO nanoparticles in the thin films was confirmed by XRD and FTIR.• The measured rms roughness of the thin film is found to be 12 ± 1 µm with the adhesion of 5B on glass.• The wetting property shows that the surface of the film is superhydrophobic with the CA of 156 ± 4° and CAH of 4 ± 2°.• The drag reduction on the surface of superhydrophobic glass sphere is 16% lower than as-received glass sphere. AbstractThe nanocomposite thin films of stearic acid (SA)-functionalized ZnO nanoparticles incorporated in epoxy polymer matrix have been achieved. The X-ray diffraction (XRD) studies show the formation of zinc stearate on ZnO nanoparticles as the confirmation of SA-functionalization of ZnO nanoparticles in the thin films. Morphological analyses reveal the presence of micro-holes with the presence of irregular nanoparticles. The measured root mean square (rms) roughness of the thin film is found to be 12 ± 1 µm with the adhesion of 5B on both glass and aluminum substrates. The wetting property shows that the surface of the film is superhydrophobic with the contact angle of water of 156 ± 4° having contact angle hysteresis (CAH) of 4 ± 2°. The average terminal velocity in the water of the as-received glass spheres and superhydrophobic spheres were found to be 0.66 ± 0.01 m/s and 0.72 ± 0.01 m/s respectively. Consequently, the calculated average coefficients of the surface drag of the as-received glass sphere and superhydrophobic glass sphere were 2.30 ± 0.01 and 1.93 ± 0.03, respectively. Hence, the drag reduction on the surface of superhydrophobic glass sphere is found to be approximately 16% lower than as-received glass sphere.Graphical abstract

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Section: Wenzel Equation Is Written Asmentioning

confidence: 99%

Studies of drag on the nanocomposite superhydrophobic surfaces

Brassard¹,

Sarkar²,

Perron³

2015

Applied Surface Science

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“…Slip flow is an important concept because it will result in a significant reduction in pressure drop, which can greatly benefit the application of microfluidic or nanofluidic devices. Slip lengths are generally computed indirectly from pressure drop and flow rate measurements [5][6][7]. Recently, some novel techniques were developed to directly measure flow field in microchannels [8][9][10] and solid-surface interaction [11,12], so that the slip characteristics can be examined; for instance, rheometry was successfully used by Choi et al to measure slip length at the scale of microns [13,14].…”

Section: Introductionmentioning

confidence: 99%

Water slip flow in superhydrophobic microtubes within laminar flow region

Zhou

Liu

Guo-zhu

2015

Chinese Journal of Chemical Engineering

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“…Under the assistance of air film between water and hydrophobic solid surface, these structures can reduce the contact area between solid and liquid with obviously reducing the friction drag [11][12][13][14][15]. Therefore, achieving the favorable performance of the superhydrophobic surface has attracted more attentions of researchers while researches about drag reduction were still an urgent need in various fields [16,17].…”

Section: Introductionmentioning

confidence: 99%

Drag reduction of stable biomimetic superhydrophobic steel surface by acid etching under an oxygen-sufficient environment

Rong

Zhang

Mao

et al. 2020

Mater. Res. Express

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Superhydrophobic surfaces have shown utility applications in drag reduction field. A novel method based on simulation analysis and test experiments is proposed to fabricate a superhydrophobic surface with 3D flower-like micro and nano-structures on a steel ball under an O 2 rich environment. The superhydrophobic steel surface has water CA of 166±1.5°. The sliding angle is less than 2°. The experiment and the simulation of the superhydrophobic and the untreated steel ball fall under water are built to prove the validity of the method of reducing water resistance. The drag reduction ratio of the superhydrophobic steel ball is beyond 53% opposed to the untreated surface under water. A model simulation is built to simulate and analyze the solid-liquid interface drag reduction mechanism of superhydrophobic surface based on theoretical analysis. The result testifies the rationality of the drag reduction experiment.

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Experimental drag reduction study of super-hydrophobic surface with dual-scale structures

Cited by 66 publications

References 24 publications

Studies of drag on the nanocomposite superhydrophobic surfaces

Studies of drag on the nanocomposite superhydrophobic surfaces

Water slip flow in superhydrophobic microtubes within laminar flow region

Drag reduction of stable biomimetic superhydrophobic steel surface by acid etching under an oxygen-sufficient environment

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