On the Mechanism of Drag Reduction in Fully-Developed Turbulent Channel Flow with a Streamwise Microfeatured Superhydrophobic Wall

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Saadat Bakhsh m.; NOURI N.M.; NOROUZI H.

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Journal Paper

Paper Information

Journal: JOURNAL OF APPLIED FLUID MECHANICS (JAFM) Year:2017 | Volume:10 | Issue:5 Page(s): 1363-1374

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Title

On the Mechanism of Drag Reduction in Fully-Developed Turbulent Channel Flow with a Streamwise Microfeatured Superhydrophobic Wall

Author(s)

Saadat Bakhsh m. | NOURI N.M. | NOROUZI H. | Issue Writer Certificate

Keywords

Superhydrophobic surface

Drag reduction mechanism

Coherent structures

Streak strength

Abstract

The superhydrophobic drag reduction changes the structures of turbulent flow. However, the underlying mechanism is not clear. The aim of this study is to determine the alternations of turbulent flow due to applying a streamwise micro-featured superhydrophobic wall. Large eddy simulations are performed to explore the effect of micro-features on near-wall behaviors. The results indicate that the outward motion of the lifted low-speed streaks is restricted to the lower wall layers, and the region of maximum production of streamwise vorticities is shifted toward the micro-featured wall. The quadrant analysis of Reynolds stress shows that there is a stronger increase in outward motion of high-speed fluid and inward motion of low-speed fluid than ejection and sweep.

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APA: Copy

Saadat Bakhsh, m., NOURI, N.M., & NOROUZI, H.. (2017). On the Mechanism of Drag Reduction in Fully-Developed Turbulent Channel Flow with a Streamwise Microfeatured Superhydrophobic Wall. JOURNAL OF APPLIED FLUID MECHANICS (JAFM), 10(5), 1363-1374. SID. https://sid.ir/paper/308158/en

Vancouver: Copy

Saadat Bakhsh m., NOURI N.M., NOROUZI H.. On the Mechanism of Drag Reduction in Fully-Developed Turbulent Channel Flow with a Streamwise Microfeatured Superhydrophobic Wall. JOURNAL OF APPLIED FLUID MECHANICS (JAFM)[Internet]. 2017;10(5):1363-1374. Available from: https://sid.ir/paper/308158/en

IEEE: Copy

m. Saadat Bakhsh, N.M. NOURI, and H. NOROUZI, “On the Mechanism of Drag Reduction in Fully-Developed Turbulent Channel Flow with a Streamwise Microfeatured Superhydrophobic Wall,” JOURNAL OF APPLIED FLUID MECHANICS (JAFM), vol. 10, no. 5, pp. 1363–1374, 2017, [Online]. Available: https://sid.ir/paper/308158/en

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