Electrokinetic-potential fluctuations produced by pipe flow turbulence
نویسندگان
چکیده
منابع مشابه
Turbulence Transition in Pipe Flow
Pipe flow is a prominent example among the shear flows that undergo transition to turbulence without mediation by a linear instability of the laminar profile. Experiments on pipe flow, as well as plane Couette and plane Poiseuille flow, show that triggering turbulence depends sensitively on initial conditions, that between the laminar and the turbulent states there exists no intermediate state ...
متن کاملTransition in localized pipe flow turbulence.
Direct numerical simulation of transitional pipe flow is carried out in a long computational domain in order to characterize the dynamics within the saddle region of phase space that separates laminar flow from turbulent intermittency. For Reynolds numbers ranging from Re=1800 to 2800, a shoot and bisection method is used to compute critical trajectories. The chaotic saddle or edge state approa...
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 کاملSelf-similarity of Mean Flow in Pipe Turbulence
Based on our previous modi…ed log-wake law in turbulent pipe ‡ows, we invent two compound similarity numbers (Y; U), where Y is a combination of the inner variable y + and outer variable , and U is the pure e¤ect of the wall. The two similarity numbers can well collapse mean velocity pro…le data with di¤erent moderate and large Reynolds numbers into a single universal pro…le. We then propose an...
متن کاملStable Manifolds and the Transition to Turbulence in Pipe Flow
Lower-branch traveling waves and equilibria computed in pipe flow and other shear flows appear intermediate between turbulent and laminar motions. We take a step towards connecting these lower-branch solutions to transition by deriving a numerical method for finding certain special disturbances of the laminar flow in a short pipe. These special disturbances cause the disturbed velocity field to...
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ژورنال
عنوان ژورنال: AIChE Journal
سال: 1967
ISSN: 0001-1541,1547-5905
DOI: 10.1002/aic.690130216