Some aspects of steady and accelerated motion of rotating viscous fluids

An apparatus and its associated instrumentation, designed and built to study problems related to steady-state and-accelerated motion of rotating fluids are described. Experiments were conducted within the limitations of the existing equipment to determine the festive end reliability of the combined unit. Both sets of experiments were run under steady State Conditions. Through a theoretical treatment by Stokes and Brodmann in which the couple exerted on one cylinder is shown to be a function of the speed of the other, the fluid viscosity, and the cylinder radii, it was, found that an additional calibration was required before quantitative results could be obtained. The experiments, however, indicated excellent repeatability suggesting little random error and the probability of reliable data once the Calibration was completed. The equipment was used in the second group of experiments to detect the onset of fluid instability characterised by an increase in the frictional couple exerted on the fluid boundaries. It was possible to detect unstable conditions, however lack of sensitivity in the/the misting instrumentation prevented the recording of absolute values. With suitably-prepared solutions, the onset of instability, expressed as a ratio, was determined visually to within -2% of the estimated value. A theoretical analysis by Professor T H. forms the basis for proposed experiments in accelerated motion. In, the paper, Havelook considers be motion of a hollow cylinder pertaining a viscous fluid being accelerated from rest under the action of constant torque. A non-dimensional representation of the relevant parameters is suggested in the present paper as a means of Comparing theoretical end experimentally determine results. In order to simplify computation of the theoretical solution a programme rue written for the "DIME" computer and using a typical but hypothetical sat of values, a electrocurves was produced. A discussion of the theoretical solutions end of probable-experimental results is given followed by a suggested course of future Programme