Description The cross-slot device is a device that consists of two bisecting channels, with two entrances and two exits, used to bring streams into contact. Cross-slot flows are ubiquitous in industrial and natural applications and generate regions of extensional flows that are very effective in stretching molecules and consequently changing the flow characteristics. In this project the flow through a cross-slot device will be studied numerically using computational fluid dynamics, with particular emphasis on the effect of geometrical parameters as well as the interfacial tension and viscosity ratio between the two fluids. Key Objectives Perform a literature survey on extensional flows Mesh the selected geometries with different levels of refinementPerform numerical simulations using OPENFOAM (or ANSYS)Validate the numerical results by comparison with data available in the literatureAnalyse the flow field and evaluate the effect geometric and hydrodynamic parameters, including viscosity ratio.