Non-Newtonian fluid flow through the Kenics static mixer for varying height/diam. ratio (H/D 1.0, 1.5, 2.0) was studied by using computational fluid dynamic (CFD) method. The simulations were carried out both for steady state and Reynolds nos. 5 and 15. Cross model was used. As a closure model for non-Newtonian fluid. The CFD data were compared with exptl data from laser Doppler anemomeby measurements carried out for mixing element with H/D 1.5. Applicability of the Cross model for eng. calcns. at low Reynolds nos. was confirmed.