Fortes Paula R, Feres Mario A, Sasaki Milton K, Alves Evandro R, Zagatto Elias A G, Prior João A V, Santos João L M, Lima José L F C
Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, P.O. Box 96, Piracicaba 13400-970, Brazil.
Talanta. 2009 Sep 15;79(4):978-83. doi: 10.1016/j.talanta.2009.01.062. Epub 2009 Feb 13.
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.
多泵流动系统利用电磁泵输送的脉冲流。其性能的提升依赖于脉冲流固有的增强径向质量传输，这是由于形成了漩涡，进而产生了湍流混合的趋势。本文给出了与脉冲流相关的湍流混合的若干证据，如记录的峰形、流化床的形成、流动反转的利用、相对缓慢化学反应的实施和/或反应介质的加热。此外，还估算了与脉冲流的GO期相关的雷诺数，并给出了在层流状态和脉冲流条件下流动的分散样品的照片图像。
