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Article

Noise Reduction Effect of Superhydrophobic Surfaces with Streamwise Strip of Channel Flow

by 1,2,3, 1,2,3,*, 1,2,3 and 1,2,3
1
Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China
2
Key Laboratory of Marine Information Acquisition and Security, Ministry of Industry and Information Technology, Harbin Engineering University, Harbin 150001, China
3
College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2021, 11(9), 3869; https://doi.org/10.3390/app11093869
Received: 8 April 2021 / Revised: 22 April 2021 / Accepted: 23 April 2021 / Published: 25 April 2021
(This article belongs to the Special Issue Recent Advances in Flow-Induced Noise)
Superhydrophobic surface is a promising technology, but the effect of superhydrophobic surface on flow noise is still unclear. Therefore, we used alternating free-slip and no-slip boundary conditions to study the flow noise of superhydrophobic channel flows with streamwise strips. The numerical calculations of the flow and the sound field have been carried out by the methods of large eddy simulation (LES) and Lighthill analogy, respectively. Under a constant pressure gradient (CPG) condition, the average Reynolds number and the friction Reynolds number are approximately set to 4200 and 180, respectively. The influence on noise of different gas fractions (GF) and strip number in a spanwise period on channel flow have been studied. Our results show that the superhydrophobic surface has noise reduction effect in some cases. Under CPG conditions, the increase in GF increases the bulk velocity and weakens the noise reduction effect. Otherwise, the increase in strip number enhances the lateral energy exchange of the superhydrophobic surface, and results in more transverse vortices and attenuates the noise reduction effect. In our results, the best noise reduction effect is obtained as 10.7 dB under the scenario of the strip number is 4 and GF is 0.5. The best drag reduction effect is 32%, and the result is obtained under the scenario of GF is 0.8 and strip number is 1. In summary, the choice of GF and the number of strips is comprehensively considered to guarantee the performance of drag reduction and noise reduction in this work. View Full-Text
Keywords: channel flow; superhydrophobic surface; flow noise; flow control channel flow; superhydrophobic surface; flow noise; flow control
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MDPI and ACS Style

Niu, C.; Liu, Y.; Shang, D.; Zhang, C. Noise Reduction Effect of Superhydrophobic Surfaces with Streamwise Strip of Channel Flow. Appl. Sci. 2021, 11, 3869. https://doi.org/10.3390/app11093869

AMA Style

Niu C, Liu Y, Shang D, Zhang C. Noise Reduction Effect of Superhydrophobic Surfaces with Streamwise Strip of Channel Flow. Applied Sciences. 2021; 11(9):3869. https://doi.org/10.3390/app11093869

Chicago/Turabian Style

Niu, Chen; Liu, Yongwei; Shang, Dejiang; Zhang, Chao. 2021. "Noise Reduction Effect of Superhydrophobic Surfaces with Streamwise Strip of Channel Flow" Appl. Sci. 11, no. 9: 3869. https://doi.org/10.3390/app11093869

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