Visual 3-D modelling of stirred vessel mixing for an inclined-blade impeller

The 3-D visualization of passive tracer mixing inside a stirred vessel offe rs a powerful means of validating computational models. Taken together, the forward elevation and underneath plan views (acquired by a 45 degrees mirr or) of the mixing of a visible tracer in space and time, captured on video, present approximately 0.1 Mb of data per video frame. This density of pote ntially quantitative concentration field information is very suitable for v alidation of computational fluid mixing (CFM) predictions for models compri sed of the order of 10(5) voxels. New results are presented for an axial pu mping 45 degrees inclined-blade turbine in a semi-tech 30 dm(3) vessel equi pped for 3-D visualization. Passive scalar mixing tests have been evaluated using an improved networks-of-zones model with 32,000 zones. Conformal str etching of the radial flow configuration of existing software provides a si mple way of accommodating the predominantly axial flow pattern. Good agreem ent between theory and experiment has been demonstrated using AVS graphics, giving see-through close to photo-realism reconciliation of mixing images for two different injection positions.