Drag reduction mechanism of vapour‐assisted liquid membrane lubrication on texture surface with elevated temperature

2021 ◽  
Author(s):  
Cheng Chen ◽  
Yan Lu ◽  
Chao Xue
Keyword(s):  
Elevated Temperature ◽  
Drag Reduction ◽  
Liquid Membrane ◽  
Reduction Mechanism ◽  
Texture Surface

Drag Reduction Study about Bird Feather Herringbone Riblets

2013 ◽  
Vol 461 ◽  
pp. 201-205 ◽  
Author(s):  
Hua Wei Chen ◽  
Fu Gang Rao ◽  
De Yuan Zhang ◽  
Xiao Peng Shang
Keyword(s):  
Drag Reduction ◽  
Structural Parameters ◽  
Reduction Rate ◽  
Reduction Mechanism ◽  
Surface Drag ◽  
Flight Feather ◽  
Hollow Shaft ◽  
Smooth Edge ◽  
Bird Feather ◽  
Wild Goose

Flying bird has gradually formed airworthy structures e.g. streamlined shape and hollow shaft of feather to improve flying performance by millions of years natural selection. As typical property of flight feather, herringbone-type riblets can be observed along the shaft of each feather, which caused by perfect alignment of barbs. Why bird feather have such herringbone-type riblets has not been extensively discussed until now. In this paper, microstructures of secondary feathers are investigated through SEM photo of various birds involving adult pigeons, wild goose and magpie. Their structural parameters of herringbone riblets of secondary flight feather are statistically obtained. Based on quantitative analysis of feathers structure, one novel biomimetic herringbone riblets with narrow smooth edge are proposed to reduce surface drag. In comparison with traditional microgroove riblets and other drag reduction structures, the drag reduction rate of the proposed biomimetic herringbone riblets is experimentally clarified up to 15%, much higher than others. Moreover, the drag reduction mechanism of herringbone riblets are also confirmed and exploited by CFD.

Experimental study of drag-reduction mechanism for a dilute surfactant solution flow

2008 ◽  
Vol 51 (3-4) ◽  
pp. 835-843 ◽  
Author(s):  
Feng-Chen Li ◽  
Yasuo Kawaguchi ◽  
Bo Yu ◽  
Jin-Jia Wei ◽  
Koichi Hishida
Keyword(s):  
Experimental Study ◽  
Drag Reduction ◽  
Surfactant Solution ◽  
Reduction Mechanism ◽  
Solution Flow

Molecular dynamics study on drag reduction mechanism of nonwetting surfaces

2019 ◽  
Vol 170 ◽  
pp. 109127 ◽  
Author(s):  
Lin Shi ◽  
Chengzhi Hu ◽  
Minli Bai ◽  
Jizu Lv
Keyword(s):  
Molecular Dynamics ◽  
Drag Reduction ◽  
Reduction Mechanism

Turbulent drag reduction mechanism above a riblet surface

AIAA Journal ◽  
1994 ◽  
Vol 32 (9) ◽  
pp. 1781-1790 ◽  
Author(s):  
Yuji Suzuki ◽  
Nobuhide Kasagi
Keyword(s):  
Drag Reduction ◽  
Reduction Mechanism ◽  
Turbulent Drag Reduction ◽  
Turbulent Drag ◽  
Riblet Surface

scholarly journals Impact of the Microstructure of Polymer Drag Reducer on Slick-Water Fracturing

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Zhi-yu Liu ◽  
Fu-jian Zhou ◽  
Hong-yan Qu ◽  
Zhao Yang ◽  
Yu-shi Zou ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Drag Reduction ◽  
Network Structure ◽  
High Flow ◽  
Low Flow ◽  
Distributed Network ◽  
Reduction Mechanism ◽  
Flow Rates ◽  
Transmission Electron

Many studies have focused on the drag reduction performance of slick-water, but the microdrag reduction mechanism remains unclear since the microstructure of the drag reducer and its effect on this mechanism have not been well studied. In this study, the microstructure of the drag reducer in slick-water was effectively characterized by transmission electron microscopy. The viscoelasticity and drag reduction performance of the drag reducer with different microstructures were then investigated. Further, the effects of the microstructure of the drag reducer on the viscoelasticity and drag reduction performance of slick-water were analyzed. The results demonstrated that the viscoelasticity of slick-water is governed by the microstructure of the drag reducer, which exhibits a network structure. In addition, the drag reduction performance is related to the viscoelasticity. At low flow rates, the drag reduction performance is dominantly influenced by viscosity, whereas, at high flow rates, it is governed mainly by elasticity. Furthermore, the drag reducer with a uniformly distributed network structure exhibits the most stable drag reduction performance. This drag reducer was used in a field test and the obtained results were consistent with those of a laboratory experiment.

scholarly journals Drag Reduction Mechanism of a Circular Cylinder by Arc Grooves

2004 ◽  
Vol 70 (697) ◽  
pp. 2363-2370 ◽  
Author(s):  
Shinichi TAKAYAMA ◽  
Takuya SHIMADA ◽  
Katsumi AOKI
Keyword(s):  
Circular Cylinder ◽  
Drag Reduction ◽  
Reduction Mechanism

scholarly journals Drag reduction mechanism of Paramisgurnus dabryanus loach with self-lubricating and flexible micro-morphology

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Liyan Wu ◽  
Huan Wang ◽  
Yuqiu Song ◽  
Benhua Zhang ◽  
Yan Xu ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Reduction Mechanism ◽  
Paramisgurnus Dabryanus ◽  
Micro Morphology
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