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Numerical and Experimental Investigation of the Effect of Geometrical Parameters on the Performance of a Contraction-Expansion Helical Mixer. INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING 2014. [DOI: 10.1515/ijcre-2014-0026] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In this study, the mixing efficiency of a passive contraction-expansion helical mixer, which combines several features, such as helical pipes for induction of secondary flows and sudden expansion and contraction array for expansion vortices, was numerically and experimentally studied. We employed the method of Box–Behnken to select the appropriate design points. Then, various configurations were investigated via computational fluid dynamics (CFD) simulations. The extent of mixing was evaluated by monitoring the residence time distribution (RTD) and observing the shape of the RTD curves. A fast competitive-consecutive diazo coupling reaction is carried out to validate the RTD results. The influences of radius of curvature of the helical mixer, ratio of the length of the contraction part to expansion part, pitch of helical mixer, and the Reynolds number (Re) on mixing efficiency, and pressure drop were also investigated. As expected, the radius of curvature of the helical mixer, ratio of the length of the contraction part to expansion part, and the Reynolds number affected significantly the mixing efficiency, while the pitch of helical mixer had little influence on mixing efficiency. Quadratic models for mixing efficiency and pressure drop were then proposed and could be used for designing the optimal contraction-expansion helical mixer for the required pumping power.
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Xia H, Shu C, Chew Y, Wang Z. Approximate mapping method for prediction of chaotic mixing in spatial-periodic microchannel. Chem Eng Res Des 2010. [DOI: 10.1016/j.cherd.2010.02.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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A new adaptation of mapping method to study mixing of multiphase flows in mixers with complex geometries. Comput Chem Eng 2008. [DOI: 10.1016/j.compchemeng.2007.06.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Boesinger C, Le Guer Y, Mory M. Experimental study of reactive chaotic flows in tubular reactors. AIChE J 2005. [DOI: 10.1002/aic.10455] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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