抄録
The measuring principle for the annular viscometer is systematically developed on the basis of Newton's laws of motion and of viscocity.
The viscometer can be constructed in three types ; that is fixed tube, movable outer tube and movable inner tube types. To determine the viscosity, pressure difference and volumetric flow-rate are to be measured in the case of the fixed tube type, and force and volumetric flow-rate in the cases of the movable outer tube and movable inner tube types.
Some experiments with viscometers of all types were carrid out. Each of the viscometers have auxiliary annuli pipes on the upstream and downstream sides of the main annuli pipes.
An advantage of the annular viscometer with auxiliary pipes over the capillary viscometer is that the so-called kinetic energy correction and end correction are not needed.
The experimental results by use of the standard viscosity sample JS 50 agree fairly well with the values given by National Research Laboratory of Metrology.
