Experimental study on effect of elasticity on drag reduction and turbulent fluctuations in laminar‐turbulent transition region in pipe flow of dilute polymer solutions

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<jats:title>Abstract</jats:title><jats:p>By utilizing the fact that physical properties exclusive of elasticity of dilute polyacrylamide solutions do not change with elapsed time after preparation, the effect of elasticity on drag reduction and turbulent fluctuations in pipe flow was investigated experimentally.</jats:p><jats:p>The oscillations of axial velocity and velocity gradient and the drag reduction in the laminar‐turbulent transition region are affected significantly by the value of elasticity. The laminar‐turbulent transition region moves to a higher Reynolds number as the value of elasticity increases.</jats:p>

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