Emulsion flow is crucially important in numerous fluid mechanics and industrial applications. This paper investigates the flow structure and hydrodynamic parameters of emulsion flow in curved diffusers of rectangular cross section and different angles and curvature ratios. The work was undertaken using the general-purpose CFD package ANSYS FLUENT with proper verification and validation procedures. The CFD model utilized the turbulence model to close the RANS equation and a single phase fluid model. The emulsion flow was presented in the computational model via its physical properties assuming homogenous mixing between the primary and secondary fluid phases. The effects of Reynolds number and diffuser geometry on the hydrodynamic performance of the diffuser as well as the flow structure were investigated and discussed.