Modeling of Expansion and Collapsion of a Single-Bubble Cavitation with Considering of Chemical Reactions and Heat Transfer

Formation of cavitation bubbles and their collapse regarding its advantages and disadvantages are some important engineering issues. We can point out to some cases like the presence of these bubbles in the satellite cooling system and the flow over hydrofoils، where cavitation bubbles are formed in fluid flows. Generally، when the fluid pressure decreases so close to the vapor pressure at a specific temperature، the bubbles are created together with the fluid vapor. One time، these bubbles enter the high pressure region، they collapse and their radius take the minimum size، simultaneously. In this case pressure and temperature increases in the bubbles such that the chemical reaction which lead to molecular dissociation becomes active and as a result of very high temperature، bubble emits light. Along with this numerical study، bubble changes and its characteristics in different conditions were investigated and the effects of various factors on bubble growth and collapse were studied.