Study on dynamic behavior of droplet impact on wall during flash spray cooling
Flash spray cooling technology is widely used in aerospace,laser medical,electric power and other fields due to its excellent cooling ability,and the kinetic behavior characteristics of the droplets after impacting the wall have an important in-fluence on the cooling process.The kinetic behavior of droplet impact on the wall surface during flash spraying was numerically simulated using the VOF method,and compared with the morphology change of droplet impact on the wall surface in conventional spray cooling without flash evaporation.The results show that the droplet impacting the wall during flash spray cooling would pro-duce bubbles and then fracture due to its own superheated phase transition;the droplet is more likely to fracture when the super-heat or wall temperature increases,and the droplet diameter or initial velocity decreases;the spreading coefficient of the droplet increases with the superheat,the initial diameter,the initial velocity,and the wall temperature,and there is a significant in-crease in the spreading coefficient when the fracture occurred.
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