Benjamin Franklin & CFD - Cham

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Philadelphia CFD ConferenceApplication of MFM to a stirredchemical reactorApril 2010Here is an old CFD-benchmark problem: 3D, transient with a rotatingcentral paddle. We consider the mixing and rapid reaction of acid, in thebottom half, with alkali in the top half. The geometric grid is shown below.Two cases are considered, 1. neglecting and2. considering population effects.For case 2, the acid~alkali range is divided into eleven equal partsCase 1 is what most designers use today; but it is too optimistic.
Philadelphia CFD ConferenceApplication of MFM to a stirredchemical reactor: conclusionApril 20103D contour diagrams of productconcentration after 10 paddlerevolutions are shown forcases 1 and 2.The general patterns differ littlebut their quantitative scales do:namely from 3.2 to 2.4.So neglecting fluctuationsover-estimates reactorperformance.The explanation lies in the following calculated mixture-ratiohistograms, corresponding to a single: instant of time, vertical heightand circumferential angle, at six different radial locations.Product concentration is high only for the middle mixture ratios.
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Benjamin Franklin & CFD - Cham

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