چكيده به لاتين
Cavitation is known as a phenomenon for the creation, growth, and collapse (cave) of micro-sized bubbles. A system in which cavitation occurs is called hydrodynamic cavitation reactors. These reactors are used in processes such as Purification processes, water disinfection, material decomposition, production of nanoparticles and so on. During the collapse of cavitation bubbles, a lot of temperature and pressure created. Due to the high temperature and pressure, free radicals are formed. These effects are favorable in some processes and in others undesirable. In this study, the prediction was made using Keller-Miksis equations, and mass and energy equations, the dynamic behavior of the bubble radius, temperature, pressure, penetration of permeable gas in the bubbles, was predicted. For this purpose, the parameters of outlet pressure, initial bubble radius, bottleneck diameter to downstream pipe diameter ratio, temperature, cavitation number, and impermeable gas type were investigated. Based on the analysis performed, it was concluded that the main factor affecting the bubble dynamics is the external pressure of the fluid bulk which can affect other parameters. Also, the permeability of permeable gases, the geometrical characteristics, and the fluid temperature have a significant impact on the life span of the bubble. The temperature and pressure obtained from the modeling were calculated to be about 5000-5000 K and 8000-4000 atm, respectively. Also, the number of permeable gases molecules inside the bubble are derived in 1017 scale
