Compressive squeeze flow of generalized Newtonian fluids with apparent wall slip

The compressive squeeze flow is encountered in various processes like compr ession molding and in rheometry. It involves a complex deformation field dr iven by both shear and normal stresses. Here the flow and deformation field generated during the compressive squeeze flow of generalized Newtonian flu ids, subject to wall slip, was analyzed using both numerical simulation bas ed on the 2-D Finite Element Method and the 1-D analytical model, which is based on the lubrication assumption. The agreement between the analytical a nd numerical solutions deteriorates wit increasing Navier's wall slip coeff icient and the increasing yield stress value of the viscoplastic fluid. The lubrication assumption is valid under various squeeze flow conditions but numerical analysis in conjunction with experimental studies are necessary t o determine the ranges of material parameters and operating conditions for which the lubrication assumption is valid.