AN EXPERIMENT ON THE BREAKUP OF IMPINGING DROPLETS ON A HOT SURFACE

Breakup characteristics of liquid droplets impinging on a hot surface are investigated experimentally with the wall temperatures in the Leid enfrost temperature range of 220-330 degrees C for n-decane fuel. Fact ors influencing droplet breakup are wall temperature, impinging veloci ty, droplet diameter and impinging angle. The 50% breakup probability shows that the impinging velocity decreases linearly with the droplet diameter increase and there exists an optimum impinging angle near 80 degrees having the minimum value in the impinging velocity for given w all temperature and droplet size. Near the wall. temperature of 250 de grees C corresponding to the Leidenfrost temperature, a peculiar nonli near behavior in the breakup probability is observed.