Shedding some light on b-factors

Teakle, I. A. and Nielsen, P. (2004). Shedding some light on b-factors. In: M Behnia, W Lin and G d McBain, 15th Australasian Fluid Mechanics Conference. 15th Australasian Fluid Mechanics Conference, University of Sydney, (1-7). 13-17 December 2004.


Author Teakle, I. A.
Nielsen, P.
Title of paper Shedding some light on b-factors
Conference name 15th Australasian Fluid Mechanics Conference
Conference location University of Sydney
Conference dates 13-17 December 2004
Proceedings title 15th Australasian Fluid Mechanics Conference
Place of Publication Sydney, Australia
Publisher University of Sydney
Publication Year 2004
Sub-type Fully published paper
ISBN 1864876956
Editor M Behnia
W Lin
G d McBain
Volume CD Rom
Start page 1
End page 7
Total pages 7
Collection year 2004
Abstract/Summary The use of a Fickian (infinitesimal–mixing–length) framework for the case of turbulent mixing can necessitate the use of ad hoc modifications (e.g. β–factors) in order to reconcile experimental data with theoretical expectations. This is because in many cases turbulent mixing occurs on scales which cannot be considered infinitesimal. In response to this problem a Finite–Mixing– Length (FML) model for turbulent mixing was derived by Nielsen and Teakle. This paper considers the application of this model to the scenario of suspended sediment in steady, uniform channel flows. It is shown that, unlike the Fickian framework, the FML model is capable of explaining why β– factors are required to be an increasing function of ws/u*. The FML model does not on its own explain observations of β < 1, seen in some flat–bed experiments. However, some potential reasons for β < 1 are considered.
Subjects 290802 Water and Sanitary Engineering
770402 Land and water management
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Thu, 23 Aug 2007, 20:11:08 EST