Results 261 to 270 of about 37,322 (309)
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Aerodynamic Drag and Drag Reduction
41st Aerospace Sciences Meeting and Exhibit, 2003An 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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The onset of drag reduction by dilute polymer additives, and the maximum drag reduction asymptote
Journal of Fluid Mechanics, 2000Drag 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. +1 more
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Comparison Between Microbubble Drag Reduction and Viscoelastic Drag Reduction
2011Both 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 +2 more
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Stokes’ Mechanism of Drag Reduction
Volume 2: Symposia, Parts A, B, and C, 2003The 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, 2003The 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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1989
Over the past twenty-five years there has been extensive and sustained research aimed both at determining techniques for reducing skin friction drag and at explaining how successful techniques work. Certainly, one reason for pursuing this research is because of our need to drive systems faster and farther for the same power, but this is only part of ...
C. L. Merkle, S. Deutsch
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Over the past twenty-five years there has been extensive and sustained research aimed both at determining techniques for reducing skin friction drag and at explaining how successful techniques work. Certainly, one reason for pursuing this research is because of our need to drive systems faster and farther for the same power, but this is only part of ...
C. L. Merkle, S. Deutsch
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1995
The subject of turbulence is by far too complicated to be handled in an introductionary chapter. Therefore, the goal of these notes is to introduce those elements of a description of turbulence which are relevant for representing the interaction of a turbulent flow field with dissolved or suspended additives.
A. Gyr, H.-W. Bewersdorff
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The subject of turbulence is by far too complicated to be handled in an introductionary chapter. Therefore, the goal of these notes is to introduce those elements of a description of turbulence which are relevant for representing the interaction of a turbulent flow field with dissolved or suspended additives.
A. Gyr, H.-W. Bewersdorff
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AIChE Journal, 1975
AbstractDrag reduction by dilute solutions of linear, random‐coiling macromolecules in turbulent pipe flow is reviewed. The experimental evidence is emphasized in three sections concerned with the graphical display of established features of the phenomenon, data correlation and analysis, and the physical mechanism of drag reduction.
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AbstractDrag reduction by dilute solutions of linear, random‐coiling macromolecules in turbulent pipe flow is reviewed. The experimental evidence is emphasized in three sections concerned with the graphical display of established features of the phenomenon, data correlation and analysis, and the physical mechanism of drag reduction.
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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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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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2015
Abstract : National Center for Computational Engineering (SimCenter), University of Tennessee at Chattanooga, focused on the development of a computational procedure to evaluate various drag reduction strategies for hydrodynamically bluff-body vehicles.
Bruce Hilbert +2 more
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Abstract : National Center for Computational Engineering (SimCenter), University of Tennessee at Chattanooga, focused on the development of a computational procedure to evaluate various drag reduction strategies for hydrodynamically bluff-body vehicles.
Bruce Hilbert +2 more
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