Shear flow of a heterophase liquid interlayer and its structural-rheological model

The shear flow of micrometer $n$-hexadecane interlayers is studied using a rotary viscometer. The viscosity of the flow in such interlayers differs from the viscosity of the liquid in the bulk, which is measured by capillary viscometers. This is due to the fact that surface structured layers with different viscosity play a significant role in thin interlayers. To describe the features of the flow of an inhomogeneous interlayer including such layers, its rheological models is considered, in which molecules in the layers are reoriented by the flow; accordingly, their viscosity is determined by the strain rate. The model is used to calculate the parameters of the structured layer.