In order to eliminate the influence generated by ultrasonic scale removalin

the two-phase flow model

the cavitations model and the standard Κ-ε turbulence model in fluent software are adopted in the paper.The results showed the relationship between the variation regularities of flow field pressure and the time step

the flow field wave is a light like the fluctuation of sine wave.The concept of cavitation number is introduced，and the functional relationship which is deduced by π theorems between Reynolds number and cavitation number is programmed for these experiment.Experiments show that the Reynolds number decreases with the cavitation number increase.With the relation of the field synergy number and the cavitation number，the  field synergy number increases with the cavitation number increase，in that，it strengthens the heat-transfer efficiency between thermal exchanger and the environment.