Effect of Reflected Wave from the Wall of a Vessel and End Effect of the Plate in the Oscillating-plate Method.

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  • Iida Takamichi
    Department of Materials Science and Processing, Faculty of Engineering, Osaka University
  • Tanaka Toshihiro
    Department of Materials Science and Processing, Faculty of Engineering, Osaka University
  • Koike Masahiro
    Department of Materials Science and Processing, Faculty of Engineering, Osaka University

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The effect of reflected wave and the end effect of a new oscillating-plate viscometer, constructed by Sasahara et al., have been investigated experimentally over a wide range of viscosity. The results obtained are as follows:<br>(1) The resonant frequencies of the plate oscillations in liquid samples decrease with increasing ρμ values. However, the viscosity dependence of the resonant frequency is negligibly small when an adequate leaf-spring is used for chinning the plate attached to stem.<br>(2) The effect of reflected wave from the wall of a vessel is negligible when the distance between the plate and wall is kept over one wavelength of the wave produced by the plate oscillations.<br>(3) The end effect of the oscillating-plate increases with increasing not only the thickness of the plates but also the viscosity of liquids.<br>(4) The working formula for viscosity determination by the oscillating-plate method should be corrected by considering the above two effects.

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