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Superhydrophobic stretchable sensors based on interfacially self-assembled carbon nanotube film for self-sensing drag-reduction shipping. [PDF]

RSC Adv
Wang S, Deng W, Yang W.
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Anisotropy in turbulent drag reduction

Physical Review Letters, 1990
We have studied turbulent drag reduction using the technique of photon-correlation homodyne spectroscopy to measure turbulent velocity gradients in a dilute polymer solution. A large anisotropic suppression of turbulent velocity differences is found in the bulk region of the turbulent fluid and along the direction of the mean flow.
Tong, Penger, Goldburg, Walter I., Huang, J.S., Witten, Thomas A.   +3 more
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Drag Reduction in Nature

Annual Review of Fluid Mechanics, 1991
Recent studies on the drag-reducing shapes, structures, and behaviors of swimming and flying animals are reviewed, with an emphasis on potential analogs in vehicle design. Consideration is given to form drag reduction (turbulent flow, vortex generation, mass transfer, and adaptations for body-intersection regions), skin-friction drag reduction ...
D. M. Bushnell, K. J. Moore
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Drag reduction with the slip wall

AIAA Journal, 1996
For rigid surfaces immersed in a flow, the no-slip condition on the wall holds. In simplistic terms, the basic idea of our slip wall is to release the no-slip condition to reduce drag. This is achieved with a belt that replaces the rigid wall. The moving belt, driven by the flow shear stress itself, reduces the velocity difference between mean flow and
Bechert, D. W., Hage, W., Bruse, M.
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Aerodynamic Drag and Drag Reduction

41st Aerospace Sciences Meeting and Exhibit, 2003
An assessment of the role of fluid dynamic resistance and/or aerodynamic drag and the relationship to energy use in the United States is presented. Existing data indicates that up to 25% of the total energy consumed in the United States is used to overcome aerodynamic drag, 27% of the total energy used in the United States is consumed by transportation
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Comparison Between Microbubble Drag Reduction and Viscoelastic Drag Reduction

2011
Both microbubble drag reduction (MBDR) and viscoelastic drag reduction (VEDR) are an effective method to reduce the frictional resistance of a turbulent boundary layer. The synergy effect of the combination of MBDR and VEDR puts more significance on the observation of the surfactant microbubbly flow. This paper reviews the main influencing factors, the
Li-Fang Jiao, Tomoaki Kunugi, Feng-Chen Li   +2 more
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The onset of drag reduction by dilute polymer additives, and the maximum drag reduction asymptote

Journal of Fluid Mechanics, 2000
Drag reduction due to dilute addition of high polymers has been known for about fifty years. In spite of this long history, many aspects of the problem remain poorly understood. Two of its features for pipe flow are considered here in the context of the elastic theory of de Gennes: the onset of drag reduction and the so-called maximum drag ...
Sreenivasan, Katepalli R., White, Christopher M.   +1 more
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Pumping or drag reduction?

Journal of Fluid Mechanics, 2009
Two types of wall actuation in channel flow are considered: travelling waves of wall deformation (peristalsis) and travelling waves of blowing and suction. The flow response and its mechanisms are analysed using nonlinear and weakly nonlinear computations.
Hœpffner, Jérôme, Fukagata, Koji
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Stokes’ Mechanism of Drag Reduction

Volume 2: Symposia, Parts A, B, and C, 2003
The mechanism of drag reduction due to spanwise wall oscillation in a turbulent boundary layer is considered. Published measurements and simulation data are analyzed in light of Stokes’ second problem. A kinematic vorticity reorientation hypothesis of drag reduction is first developed.
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Hydrobionic Principles of Drag Reduction

International Journal of Fluid Mechanics Research, 2003
The author considers characteristic features of submerged moving water animals from the point of view to reduce the energy consumption. Principles of functioning hydrobiont, peculiarities of morphology and physiology of a skeleton, muscles, skin covers, circulatory system and dolphin innervation with regard to the force action of biosphere to animals ...
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