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Evidences of turbulent mixing in multi-pumping flow systems

By Paula R. FORTES, Mario A. FERES, Milton K. SASAKI, Evandro R. ALVES, Elias A. G. ZAGATTO, Joao A. V. PRIOR, Joao L. M. SANTOS and Jose L. F. C. LIMA

Abstract

Multi-pumping flow systems exploit pulsed flows delivered by Solenoid pumps. Their improved performance rely on the enhanced radial mass transport inherent to the pulsed flow, which is a consequence of the establishment of vortices thus a tendency towards turbulent mixing. This paper presents several evidences of turbulent mixing in relation to pulsed flows. such as recorded peak shape, establishment of fluidized beds, exploitation of flow reversal, implementation of relatively slow chemical reactions and/or heating of the reaction medium. In addition, Reynolds number associated with the GO period of a pulsed flow is estimated and photographic images of dispersing samples flowing under laminar regime and pulsed flow conditions are presented. (C) 2009 Elsevier B.V. All rights reserved

Topics: Flow analysis, Multi-pumping, Turbulent mixing, Sample dispersion, Pulsed flow, TOTAL REDUCING SUGARS, INJECTION ANALYSIS, SPECTROPHOTOMETRIC DETERMINATION, BEAD INJECTION, TOTAL ACIDITY, PULSED FLOWS, OPEN TUBES, DISPERSION, INSTRUMENTATION, OPTIMIZATION, Chemistry, Analytical
Publisher: ELSEVIER SCIENCE BV
Year: 2009
DOI identifier: 10.1016/j.talanta.2009.01.062
OAI identifier: oai:www.producao.usp.br:BDPI/17084
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