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Transient anomalous diffusion in Poiseuille flow

Published online by Cambridge University Press:  15 August 2001

MARCO LATINI
Affiliation:
Harvey Mudd College, Claremont, CA 91711, USA
ANDREW J. BERNOFF
Affiliation:
Harvey Mudd College, Claremont, CA 91711, USA

Abstract

We revisit the classical problem of dispersion of a point discharge of tracer in laminar pipe Poiseuille flow. For a discharge at the centre of the pipe we show that in the limit of small non-dimensional diffusion, D, tracer dispersion can be divided into three regimes. For small times (t [Lt ] D−1/3), diffusion dominates advection yielding a spherically symmetric Gaussian dispersion cloud. At large times (t [Gt ] D−1), the flow is in the classical Taylor regime, for which the tracer is homogenized transversely across the pipe and diffuses with a Gaussian distribution longitudinally. However, in an intermediate regime (D−1/3 [Gt ] t [Gt ] D−1), the longitudinal diffusion is anomalous with a width proportional to t [Lt ] Dt2 and a distinctly asymmetric longitudinal distribution. We present a new solution valid in this regime and verify our results numerically. Analogous results are presented for an off-centre release; here the distribution width scales as D1/2t3/2 in the anomalous regime. These results suggest that anomalous diffusion is a hallmark of the shear dispersion of point discharges at times earlier than the Taylor regime.

Type
Research Article
Copyright
© 2001 Cambridge University Press

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