STATIC MIXER COMPRISING A STATIC MIXING ELEMENT, METHOD OF MIXING A FLUID IN A CONDUIT AND A FORMULA FOR DESIGNING SUCH A STATIC MIXING ELEMENT
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United States of America Patent
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Issued Date -
May 3, 2012
app pub date -
Dec 10, 2009
filing date -
Dec 10, 2008
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Abandoned
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Abstract
Using the Mapping Method different designs of SMX motionless mixers are analyzed and optimized. The three design parameters that constitute a specific SMX design are: the number of cross-bars over the width of channel, Nx, the number of parallel cross-bars per element, Np, and the angle between opposite cross-bars θ. Optimizing Nx, somewhat surprisingly reveals that in the standard design with Np=3, Nx=6 is the optimum using both energy efficiency as well as compactness as criteria. Increasing Nx results in under-stretching and decreasing Nx leads to over-stretching of the interface. Increasing Np makes interfacial stretching more effective by co-operating vortices. Comparing realized to optimal stretching, we find the optimum series for all possible SMX(n) designs to obey the universal design rule Np=(⅔)Nx−1, for Nx=3, 6, 9, 12, . . .
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