Simultaneous Eulerian–Lagrangian velocity measurements of particulate pipe flow in transitional regime
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چکیده
منابع مشابه
Lifetime 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...
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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 کاملTransition to turbulence in particulate pipe flow.
We investigate experimentally the influence of suspended particles on the transition to turbulence. The particles are monodisperse and neutrally buoyant with the liquid. The role of the particles on the transition depends upon both the pipe to particle diameter ratios and the concentration. For large pipe-to-particle diameter ratios the transition is delayed while it is lowered for small ratios...
متن کاملHeat Transfer in the Transitional Flow Regime
Transitional flow, whereby the motion of a fluid changes from laminar to turbulent flow, was successfully identified by Reynolds (1883) almost 130 years ago. According to ASHRAE (2009), for a round pipe, in general, laminar flow exists when the Reynolds number is less than 2 300. Fully turbulent flow exists when the Reynolds number is larger than 10 000 and transitional flow exists for Reynolds...
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 ...
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ژورنال
عنوان ژورنال: Review of Scientific Instruments
سال: 2020
ISSN: 0034-6748,1089-7623
DOI: 10.1063/1.5129062