CFD simulation of mixing for high?solids anaerobic digestion

AbstractA computational fluid dynamics (CFD) model that simulates mechanical mixing for high?solids anaerobic digestion was developed. Numerical simulations of mixing manure slurry which exhibits non?Newtonian pseudo?plastic fluid behavior were performed for six designs: (1) one helical ribbon impeller, (2) one anchor impeller, (3) one curtain?type impeller, (4) three counterflow (CF?2) impellers, (5) two modified high solidity (MHS 3/39o) impellers, and (6) two pitched blade turbine impellers. The CFD model was validated against measurements for mixing a Herschel?Bulkley fluid by ribbon and anchor impellers. Based on mixing time with respect to mixing energy level, three impeller types (ribbon, CF?2, and MHS 3/39�) stand out when agitating highly viscous fluids, of these mi...

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