**5. Conclusion**

A numerical simulation of the phenomenon of cavitation in a 2D-axisymmetric configuration of a diesel injector nozzle has been presented. A turbulent mixture model has been adopted to simulate the multiphase flow. The study is carried out in two regimes, namely stationary and transient. The effect of the geometric parameters of the injector (e.g orifice length and the corner radius) on the cavitation phenomenon inside the nozzle has been studied.

Unsteady simulations have also been carried out. The space–time evolution of the vapor fraction is analyzed.

In the other hand, the entropy production inside the diesel injector is analyzed. Firstly, the local entropy distribution in the orifice is studied for a single phase and laminar flow under several average inlet velocity. In the second part, we analyzed the entropy production for a single phase and trubulent flow. In the same way, the effet of average inlet velocity on the entropy production is studied. Finally, the entropy production is studied for two-phase, turbulent and cavitating flow. In this case, the effet of cavitation number on local entropy production in the orifice is analyzed.

The main conclusions from the present study can be summarized as follows:


*Analysis of Geometric Parameters of the Nozzle Orifice on Cavitating Flow and Entropy… DOI: http://dx.doi.org/10.5772/intechopen.99404*

**Figure 19.** *Total entropy production in decimal logarithm as a function of cavitation number K.*


*Applications of Computational Fluid Dynamics Simulation and Modeling*
