Resumo

GARDEA-VILLEGAS, H. Two proposals for pumping calculations of non-newtonian fluids, water treatment plants disposal sludges case. Ing. invest. y tecnol. [online]. 2008, vol.9, n.2, pp.87-97. ISSN 2594-0732.

This paper presents two ways to calculate the pumping power of non Newtonian fluids and especially yield pseudoplastics which are the kind of disposal fluids from Water Treatment Plants. Fluids called sludges. The proposals included here, are based in methods suggested by Levenspiel (1986) applicable to determine the performance of Bingham plastics and pseudoplastic fluids using a graphical approximation of the rheological behavior of these materials. This approach has the advantage that is appropriate to any kind of regime. Otherwise, Levenspiel underlines, that there is not yet a chart who relates the roughness coefficient with the Reynolds number for general plastics, so it is not possible by now to calculate the yield pseudoplastic fluid. Its calculation is the aim of this study. Levenspiel proposes an approach subject to the assessment of the project manager, and will therefore entail personal observations, with the limitations that this can cause. The results obtained by both propositions, are very similar. This is part of a doctorate study done by the author under the direction of Dr. Rafael B. Carmona in the Faculty of Engineering of the National Autonomous University of Mexico.

Palavras-chave : Non-Newtonian fluids; sludges; algorithms to calculate pumping; yield pseudoplastic; water treatment plants; fluid regime.

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