An experimental study of transitional pulsatile pipe flow
نویسندگان
چکیده
منابع مشابه
Pulsatile Blood Flow in a Pipe
ÐThe unsteady ̄ow of blood in a straight, long, rigid pipe, driven by an oscillatory pressure gradient is studied. Three dierent non±newtonian models for blood are considered and compared. One of them turns out to oer the best ®t of experimental data, when the rheological parameters are suitably ®xed. Numerical results are obtained by a spectral collocation method in space and the implicit tr...
متن کاملLifetime statistics in transitional pipe flow.
Several experimental and numerical studies have shown that turbulent motions in circular pipe flow near transitional Reynolds numbers may not persist forever, but may decay. We study the properties of these decaying states within direct numerical simulations for Reynolds numbers up to 2200 and in pipes with lengths equal to 5, 9, and 15 times the diameter. We show that the choice of the ensembl...
متن کاملCoherent structures in transitional pipe flow
Leo H. O. Hellström, a) Bharathram Ganapathisubramani, b) and Alexander J. Smits c) Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, U.S.A. Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, U.K. Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, U.S.A., and Mechanical and Aerospace Engineer...
متن کاملTurbulent Pulsatile Pipe Flow with Multiple Modes of Oscillation
This study numerically investigates turbulent pipe flow driven by a pulsating pressure gradient. While studies of laminar and turbulent pulsatile pipe flow with a single mode of oscillating pressure gradient have been carried out extensively, there is scarce literature on pulsating pressure gradients with multiple temporal Fourier modes. In many real-life engineering applications, for example, ...
متن کاملRecurrence of Travelling Waves in Transitional Pipe Flow
The recent theoretical discovery of families of travelling wave solutions in pipe flow (Faisst & Eckhardt 2003; Wedin & Kerswell 2004; Hof et al. 2004) at Reynolds numbers lower than the transitional range naturally raises the question of their relevance to the turbulent transition process. Here a series of numerical experiments are conducted in which we look for the spatial signature of these ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics of Fluids
سال: 2012
ISSN: 1070-6631,1089-7666
DOI: 10.1063/1.3673611