Results 251 to 260 of about 550,989 (293)
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Three-dimensional instability of a two-layer Dean flow
Physics of Fluids, 2001Stability of a two-layer Dean flow in a cylindrical annulus with respect to three-dimensional perturbations is studied by a global Galerkin method. It is shown that for large inner radius of the annulus (i) the instability becomes three-dimensional if one of the fluid layers is thin, (ii) its onset is not affected by possible small deformations of the ...
Gelfgat, Alexander Yu. +2 more
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Dean vortices in turbulent flows: rocking or rolling?
Journal of Visualization, 2011Flows in pipe bends have been studied extensively over the last decades due to their occurrence both in the human respiratory and blood systems as well as in many technical applications.
Athanasia Kalpakli +2 more
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Resonant Interactions of Dean Vortices in a Curved Channel Flow
Journal of the Physical Society of Japan, 1998Summary: Stability of the flow in a curved channel is investigated with the Dean approximation by using the weakly nonlinear stability theory. A set of amplitude equations for the Dean vortices of wavenumber ratio \(1:2\) is derived. The amplitude equations describe the resonant interactions between the fundamental mode and the higher harmonic.
Mizushima, Jiro +2 more
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Neutral curve behaviour in Taylor-Dean flow
ZAMP Zeitschrift f�r angewandte Mathematik und Physik, 1987Numerical investigations reveal a class of neutral curve in infinite Taylor-Dean flow not previously observed. Based on the work of \textit{P. Hall} [J. Fluid Mech. 124, 475-494 (1982; Zbl 0503.76054)], asymptotic expansions at the high-wavenumber end of the neutral curves are given. Previously, an interpretation had been given by \textit{D. C. Raney},
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Three-dimensional hydrodynamic flow and particle focusing using four vortices Dean flow
Microfluidics and Nanofluidics, 2014We present a three-dimensional (3D) hydrodynamic focusing device built on a single-layer platform using single sheath flow. Despite the simple structure and operation, the device not only achieves narrow focusing of a sample fluid or particles but also switches the cross-sectional size and lateral position of the sample stream.
Byung Hang Ha +3 more
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Hydrodynamic stability of Taylor–Dean flow between rotating porous cylinders with radial flow
Physics of Fluids, 2003A linear stability analysis has been implemented for the Taylor–Dean flow between porous concentric rotating cylinders when radial flow is present. The stability equations with respect to both axisymmetric and nonaxisymmetric disturbances are derived and solved by a direct numerical procedure.
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Energetic effects on the stability of viscoelastic Dean flow
Journal of Non-Newtonian Fluid Mechanics, 2000The influence of energetics on linear stability of viscoelastic Dean flow is examined for non-isothermal Oldroyd-B fluid.
Al-Mubaiyedh, U. A. +2 more
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Dean Equations Extended to a Rotating Helical Pipe Flow
Journal of Engineering Mechanics, 2003In this paper, the fully developed laminar flow in a rotating helical elliptical pipe is examined theoretically. This study focuses on the combined effects of the rotation, the curvature, the torsion, and the shape of cross section. The secondary flow and the fluid particle trajectory are discussed for different elliptical cross sections in the range ...
Jinsuo Zhang, Benzhao Zhang
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Dean’s flow of aqueous solution of poly(ethylene oxide)
Korean Journal of Chemical Engineering, 1996In this research the flow of Newtonian and drag reducing fluids through a helical tube,i.e.. Dean’s flow, was experimentally studied. The primary concern was to investigate the effect of added polymer on the secondary motion caused by the centrifugal force. The poiymer chosen in this study was poly(ethylene oxide) with the molecular weights of 300,000,
Yonghak Kim, Mu Kwon Yi, Chongyoup Kim
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SPECTRAL NUMERICAL SIMULATION OF MAGNETO-PHYSIOLOGICAL LAMINAR DEAN FLOW
Journal of Mechanics in Medicine and Biology, 2014A computational simulation of magnetohydrodynamic laminar blood flow under pressure gradient through a curved bio-vessel, with circular cross-section is presented. Electrical conductivity and other properties of the biofluid (blood) are assumed to be invariant.
O. ANWAR BEG +4 more
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