N. Subaschandar, J.N. Connor, A.V. Deev, I.R. McNeilly and D. Druskovich
Process Engineering and Light Metals Centre, Central Queensland University, Gladstone, Queensland, 4680 Australia
EXCERPT
The generally accepted approach for laboratory corrosion testing in flowing liquids is to use simple geometries that generate predictable flow that can be related to fluid- flow in complex plant situations. Common laboratory geometries include the rotating disc, rotating cylinder and the impinging jet technique. Although these techniques can model flow for a wide range of fluid velocities, only rarely do they permit quantitative modeling of plant corrosion rates. The obstacles to improving the accuracy of corrosion testing data are inherently a consequence of the very complex nature of turbulent flow. However, there is a real demand for corrosion testing under very severe flow conditions with Reynolds numbers of the order of 107 and wall shear rates as high as 105 to 107 s-1. It has been widely accepted that both wall shear stress and mass transfer coefficient are key parameters when investigating the condition of similarity between laboratory corrosion data and corrosion in the plant environment [4]. In 2005 we reported a Parallel Disc Device (PDD) that allows the generation of high wall shear rates, while maintaining laminar flow conditions
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