Characterising strongly advected discharges in the initial dilution zone |
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Authors: | G A Kikkert M J Davidson R I Nokes |
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Institution: | (1) Department of Civil Engineering, University of Canterbury, Private Bag 4800, Christchurch, New Zealand |
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Abstract: | Mean concentration fields of strongly advected non-buoyant discharges are characterised with a double-Gaussian assumption.
Comparisons with experimental data show that the approximation provides a reasonable representation of the cross-sectional
profiles. The self-similarity of these profiles enables their form to be represented by two additional parameters, one describing
the relative separation of the peaks and the other the ratio of the cross-sectional spreads. Values for these additional parameters
are determined from experimental data. This systematic approach to characterising the strongly advected flows provides a consistent
framework for determining spreading rates and concentration ratios, such as the peak to centreline maximum and the peak to
top hat. The double-Gaussian framework also provides a basis for comparisons with the CorJet and VisJet numerical models.
In addition the double-Gaussian assumption is employed to interpret data obtained using the Light Attenuation technique. This
is a relatively simple measuring system, which provides depth integrated concentration information. The data obtained using
this technique is shown to be generally consistent with that from previous studies. |
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Keywords: | Momentum puffs Advected thermals Double-Gaussian Experimental data |
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