Frictional Resistance of Rotating Disk in Dilute Polymer Solutions : Part 1, Enclosed Disk

概要

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The frictional resistances on a rotating smooth plane disk in an enclosure filled with various concentrations of polymer solutions have been investigated. The data were obtained on the torque in the laminar and turbulent flows, their range extending from disk Reynolds number 2×10^5 to 2×10^6 and axial clearane-disk diameter from s/d=0.529 to 0.118. Instantaneous photographs were taken of the flows near the surface of the disk in Newtonian fluids and polymer solutions. As a result of these observations, it has been revealed that the radial secondary flows which accompany the rotation of the disk and the disturbance they have caused are repressed by viscoelastic effect which is possessed by the polymer solutions. According to a Reiner-Rivlin model, the torque coefficients were arranged such that they might be dependent upon non-dimensional number (η_cω/η) in the laminar flows by approximate analysis, and upon (η_c/ρa^2) in the turbulent flows by experimental data.
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