Reference : Laminar flow in radial flow cell with small aspect ratios: Numerical and experimental...
Scientific journals : Article
Engineering, computing & technology : Chemical engineering
http://hdl.handle.net/2268/70978
Laminar flow in radial flow cell with small aspect ratios: Numerical and experimental study
English
Detry, Jean [Université de Liège - ULg > Gembloux Agro-Bio Tech > Unité de Technologie des IAA > >]
Deroanne, Claude [Université de Liège - ULg > Gembloux Agro-Bio Tech > Unité de Technologie des IAA > >]
Sindic, Marianne mailto [Université de Liège - ULg > Gembloux Agro-Bio Tech > Unité de Technologie des IAA > >]
Jensen, B. B. B. [> > > >]
2009
Chemical Engineering Science
Pergamon Press - An Imprint of Elsevier Science
64
1
31-42
Yes (verified by ORBi)
International
0009-2509
Oxford
United Kingdom
[en] Radial flow chamber ; Stagnation point flow chamber ; Hydrodynamics ; Computation ; Visualisation ; Fluid mechanics
[en] Studies on the effect of wall shear stress on soil and biofilm attachment and removal from a surface are one of the many applications of radial axisymmetrical flow. The particular nature of this flow allows taking advantage of a wide range of wall shear Stress applied at the analyzed surface in a single experiment. This type of experiments provides a critical radius up to which soil removal occurs. Good models are, however, still needed to convert the experimental data into critical wall shear stress. Analytical models are already available for creeping flow but Computational Fluid Dynamics must be applied for experiments performed at higher Reynolds numbers. The present study is a numerical analysis of the radial axisymmetrical flow for aspect ratios of 0.125, 0.25, 0.5 and 1 with inlet pipe Reynolds numbers varying from 0 to 2000, aiming at computing the wall shear stress distribution at any distance from the center. The simulations provided a thorough description of the complex flow pattern encountered close to the inlet section, which were validated for the laminar regime by dye injection. A total of up to four recirculation zones were identified in both numerical and experimental investigations. The experimental positions of these recirculation zones corresponded well to the numerical predictions. Based on this work, a map of the flow for the different aspect ratios was developed, which can be particularly interesting for the design of experimental devices involving axisymmetrical flow. (c) 2008 Elsevier Ltd. All rights reserved.
http://hdl.handle.net/2268/70978
10.1016/j.ces.2008.09.008

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