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Published in: Experiments in Fluids 8/2019

01-08-2019 | Research Article

Entrainment in pulsing plumes

Authors: Danlan Huang, Nicholas Williamson, Steven W. Armfield

Published in: Experiments in Fluids | Issue 8/2019

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Abstract

Turbulent axisymmetric lazy plumes produced by discharging saline fluid downwards into a less dense uniform environment from a round pipe are examined experimentally. The plume development is controlled by the source flow rate \(Q_0\), momentum \(M_0\) and buoyancy \(F_0\). This study investigated plumes where the source flow rate, momentum and buoyancy are sinusoidal functions of time. The pulsing flow is generated by a programmable ISMATEC gear pump. The maximum frequency f of this pulsing plume is of \(\mathcal {O}(U_0/D)\), where \(D/U_0\) is the eddy turnover time scale at the source, D is the source diameter, and \(U_0\) is the average velocity at the source. Experiments with pulsing plumes were carried out with a flow rate amplitude A of up to \(80\%\) and with Strouhal number \(St=fD/U_0\) ranging from 0.012 to 1.2. The bulk dilution and entrainment measurements were made using the experimental approach of Hunt and Kaye (J Fluid Mech 435:377–396, 2001). Average entrainment is obtained via the integral relationship for Q(z) and M(z) from the model established by Morton et al. (Proc R Soc Lond A 234(1196):1–23, 1956) for continuous sources. The influence of the amplitude and Strouhal number St on the entrainment coefficient \(\alpha\) is examined, which was found to be very small over the entire range of source conditions considered.

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Metadata
Title
Entrainment in pulsing plumes
Authors
Danlan Huang
Nicholas Williamson
Steven W. Armfield
Publication date
01-08-2019
Publisher
Springer Berlin Heidelberg
Published in
Experiments in Fluids / Issue 8/2019
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI
https://doi.org/10.1007/s00348-019-2770-x

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