Numerical simulation for hydrodynamic characteristics of nozzle used in water jet machining

For manufacturing of any product machining is required to give final shape. Conventional and Non-conventional machining process are available. But non-conventional machining technologies such as EDM, laser, plasma, water jet, abrasive water jet are very popular now a days because of its high machining versatility, minimum stresses on the work piece, high flexibility no thermal distortion, and small cutting forces. Water jet machining is one of non-conventional machining process used for production process. Performance of water jet machining depends on various parameter but material removal depends upon design of water jet nozzle. Practically, it is difficult to understand internal flow characteristics of liquid used for machining and hence with the help of numerical simulation parameters affecting machining process can be studied. Numerical simulation is CFD analysis, which plays a vital role to understand flow characteristics within nozzle geometry and outside nozzle, which helps to design pure water jet machining phenomena. The present study is to understand effect of high velocity jet on flat surface. Pressure, velocity and stream line has been obtained by simulating problem in commercial CFD tool ANSYS-Fluent. Results showed that a velocity of 570 m/sec can be reached for pressure up to 160 MPa.