Abstract
The characteristics of the new oscillating-plate viscometer have been investigated experimentally. The results obtained are as follows : (1) The resonant frequency of plate oscillation decreases with increasing viscosity. (2) The apparatus constant K determined experimentally includes the end and slipping effects. (3) The dimensions of the plate should be determined by referring to empirical relations between ρμ and Δ(≡{(Ea/E)-1} n) for various dimensions of the plate, where ρ is the density, μ the viscosity, Ea the resonant amplitude of plate in air, E the amplitude of plate in a liquid, and n a constant. (4) If the distance between the plate and the wall of vessel is longer than about one wavelength of the wave produced by plate, the effect of reflected wave from the wall can be neglected.
In conclusion, the theoretical working formula, i.e., ρμ=K{(Ea/E)-1}2, is mostly applicable to viscosity measured by the new viscometer. The empirical relation, i.e., ρμ=K{(Ea/E)-1} n, is eminently suitable for instantaneous and continuous viscosity measurement.
