بر رفتار اسپري در جريان دوفازي k تاثير مدل تلاطم غيرخطي

EFFECT OF NON-LINEAR k-E TURBULENCE MODEL ON THE SPRAY PERFORMANCE IN A TWO-PHASE FLOW

In this paper, two-phase gas-liquid flow together with the turbulent non-linear k-e model has been studied for the first time. The spray flow affects the gaseous environment and makes it turbulent. The turbulence intensity is influenced by the movement of droplet and its velocity. In this study, a new turbulent non-linear k-f model, SUGA, has been employed. Second order and third order models of the non-linear k-e are simultaneously studied and the outcoming results are compared with the ones of the standard k-e model. The consequent results of this research shows that in some parts of the chamber with the rotating flow, considering the rate of rotation, the non-linear k-e model works better than the standard one and leads to results closer to the experimental data. In this article, the main emphasis is on the comparison of standard k-e model and the non-linear k-e model and their effects on the rate of evaporation and penetration of the droplets. Results show that the non-linear k-e model is more capable than standard one when the velocity gradient in axial and radial directions change intensively.The flow close to the boundary, corners of the chamber and around the spray can be analyzed better than before. In this study, it is also revealed that the second and third order non-linear k-f models can work out better than the standard one and their results are closer to the experimental observations.