Microscale Emulsions And Suspensions Cells in the circulatory system, laboratory experiments, and pharmaceutical and food industry production processes interact with other cells and particles in suspension. For example, these interactions affect the viscosity of blood another physiological suspensions that in turn affect blood pressure and the power required to move suspensions through production processes and the immune system when considering the adhesion of white blood cells to target cells as well as the interaction of bacteria with blood cells. The viscosity of mixtures of animal red blood cells with different aggregation characteristics mixed with a Perflurocarbon emulsion that acts as a blood substitute are being measured in the lab. Hydrodynamic interactions affect the probability of cells aggregating with other cells and particles in free shear flows is being modeled numerically and used to predict the viscosity of different mixtures. The model of cell interactions will give us the capability to fine tune the design of pharmacological agents in the blood stream and design production processes to avoid cell damage. See animation of Tip-streaming Drop. [8.1 MB]