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Viscoelastic Merging Flow in a T-Shaped Tube

A viscoelastic merging flow in a T-shaped tube is examined using polymer (polyacrylamide) solutions. Streamlines near the junction were observed from the two-or three-dimensional standpoint of view.Upstream of the junction, we observed circulating secondary flows in the T-shaped tube as well as in a T-shaped channel which is composed of parallel plates.The streamline length changes according to the growth of circulating secondary flow.Curves of streamline length plotted with Weissenberg number present an elastic effect of viscoelastic liquid and nearly become one straight line for the various throttling ratio and polymer concentrations.Hence, the elastic property of polymer solution contributes to the growth of the circulating secondary flow.