MODELLING OF EXTENSIONAL FLOW BEHAVIOR OF POLYMERIC FLUID USING CAPILLARY THINNING EXPERIMENT

Abstract

The study presents the stretching behavior exhibits by the viscoelastic fluid with the scope of
investigating how the stretching flow method can be predicted from simple mathematical models
of polymeric fluids. However, the stretching flow technique is used to determine the extensional
properties of polymer liquids. Our results show that the stretching behavior of the polymeric
fluid causes a decline in radius. Moreover, we observed that the exponential decay curve plays a
significant contribution in determining the relaxation times. This was deduced from the
governing equations of the radially squeezed cylindrical fluid column with the use of distinct
non-dimensional parameters obtained from the force balance and three relaxation times were
achieved. The curve appears to be Newtonian at the initial stage and then changed to elastic and
cut-off in the final stage. The motive for this study is to provide a significant understanding of
fluid flow phenomenon of polymeric liquid by stretching techniques and computations. This
flow phenomenon was investigated with the view of understanding the rheological viewpoint
governing the stretching behavior in elastic fluids and the techniques employed in determining
these flow responses to deformation.