Abstract
Transition in dilute polymer solutions was investigated in the same manner as in the first report. At first we investigated natumal transition at a minimum critical Reynolds number. The result suggested that the structural change of a turbulent spot resulted in polymer drag reduction. Subsequently, we maintained the flow laminar above the minimum critical Reynolds number and visualized the evolving process of spots artificially created in the laminar flow. The result showed that polymer additives reduced the spreading half angle. The striped streak lines of ink were observed around the spots. Jhis phenomenon is supposedly caused by the instability of polymer solutions.
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