Numerical Simulation of Fluid Ejection from a Spinning Cylinder,

A computer code, based on a convective flux approximation on a finite difference Eulerian grid, was to model the rate of fluid ejection from the opened end of an azimuthally rotating cylinder. The computer code, SOLA-VOFCSL is described in a previous support. A constantly rotating cylinder, with an 80 fluid fill, is set in equilibrium solid body rotation and one end is instantaneously removed, allowing the centrifugal force to drive the fluid from the opened end. Fluid parameters have been chosen to model the behavior of water and glycerin at 25 C. The ratio of the volume ejection rate to the volume rotation shows similarity when expressed as a function of the cylinder rotation time. The fluid viscosity is observed to have negligible effect on the ejection rate for the spin rates of interest. This behavior is shown to be consistent with a dimensional analysis of the flows considered.