Effects of relaxation time of solutions and neighbor vortices on vortex deformation in two-dimensional turbulent flow

Abstract

An experimental study was performed to investigate the relationship between the extensional rheological properties of polymer solutions and vortex deformation in turbulent flow. In this study, we used 2D flow that is advantageous as it examines the effect of the extensional rheological properties of flows. Polyethyleneoxide was added to two-dimensional (2D) turbulent flow: Vortex shedding and vortex deformation in the 2D flow were visualized and analysed. The vortex shedding and deformation were categorized in three types, which was affected by relaxation time of each solution and neighbour vortices. Particle Image Velocimetry was also used to analyse variation of extensional rate in the velocity fields.