About oscillation method to study liquid viscosity

TL;DR

This paper critiques the oscillation method for measuring liquid viscosity, highlighting its incorrect assumptions and the necessity to consider torsional vibrations for accurate results.

Contribution

It reveals fundamental flaws in the traditional oscillation method and proposes that torsional vibrations must be included for reliable viscosity measurements.

Findings

The method incorrectly accounts for additional liquid mass and surface forces.

Vibrations are not purely one-dimensional, requiring torsional analysis.

Results obtained with the method are unreliable and invalid.

Abstract

It is shown that the oscillation method to study liquid viscosity of [1-3,7-34] is based on incorrect consideration of one dimensional forced (constrained) )vibrations of plate in viscous liquid, because additional (apparent) mass of liquid and surface forces are incorrectly taken into account, and Archimedes force did not taken into account. It is shown the vibrations cannot be one dimensional, and torsional vibrations need to be take into account, the results obtained with the use of the method are not reliable and incorrect.