The Dynamic Response of Periodically Deformed Non-Newtonian Fluid Films

摘要

Analysis has shown that a time average super-or subambient pressure is generated in a plane parallel squeeze film of a Maxwell fluid with shear dependent viscosity when subjected to skew periodic transverse deformation. The flow behavior index of the fluid, which indicates the deviation from the Newtonian regime, and the ratio of the period of the compression stroke to the total period determine whether the net pressure is superambient or subambient. Fluid consistency, and plate geometry and stroke affect the magnitude of the pressure values. The elastic properties of the fluid enter only into transient response terms and do not contribute to the net pressure. These effects are not obtained for Newtonian fluids or if the deformation is symmetric. Examples are given. (Author)