Abstract
Addition of a little amount of high-molecular-weight polymers in a Newtonian fluid reduces turbulent intensity, which causes the drag reduction in a pipe flow. When the drag reduction occurs in a flow, vortices generated in the flow deform. In this study, in order to understand the vortex formation and vortex deformation in turbulent flows affected by extensional rheological properties of polymer solution, we have observed the vortices in two-dimensional turbulence. Polyethylene oxide and hydroxypropylcellulose were used as polymers that have different extensional rheological properties. We investigated how the relaxation time of the polymer solution that is related to the extensional viscosity of the solution affected the vortex shedding in two-dimensional flow.
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