The study of fine particle classification is common, especially since a well-defined particle size distribution is important in most processes and products. Many methods have been developed to classify micron-size particles, and although each has its own advantage, most cannot classify particles to an extremely narrow range. This is partly due to the cohesive nature of fine particles, which can be due to electrostatic attraction, moisture, or van der Waals forces. In order to overcome this problem, a wet method of classification has been chosen here. Taylor vortices, discovered in 1923, develop in the fluid contained in the annulus of two concentric rotating cylinders. It has been shown in recent years that Taylor vortices can be used to classify particles regardless of their size (which may range from a few microns to millimeters) and density difference between the particles and fluid. This method also allows for a semi-continuous throughput of particles. The present work outlines the use of Taylor vortices to classify fine particles to a narrower size distribution. The main objective here is to determine the parameters affecting classification of glass spheres from an initial distribution ranging from 10 microns to 30 microns. Factors such as annulus width, rotational velocity, and particle feed rate have been investigated. Preliminary numerical investigations have shown that up to 90% of particles larger than 25 microns can be removed using a Taylor-Couette device, and experimental work is being carried out to validate the results obtained numerically.