This report presents the results of a study that indicate how atomization of CWS can be improved through specification of fuel properties, and also through modification of current atomizer designs. The goals of this program are: spray single-phase, high viscosity Newtonian fluids, then incorporate the complication of non-Newtonian behavior by adding polymers to the liquids being sprayed, then spray CWS without additives, followed by CWS with additives; vary coal loading while trying to keep rheology fixed; vary coal grind while trying to keep loading and rheology fixed; investigate the effects of nozzle geometry through fuel film thickness and air gap width; and study the effects of AFR and V{sub rel}. Use the data from steps one through five to develop equations for the prediction of CWS SMD. Develop similar equations for use with high viscosity single phase fluids. Use the resulting equations and the data to explain the mechanisms responsible for CWS atomization. Provide similar explanations for the atomization of single phase, high viscosity fluids. Finally, suggest new methods of atomization. 15 refs., 65 figs., 10 tabs.