Abstract
Based on pool film boiling, Heat transfer coefficient and cooling model are established when fogdrop jet into cutting zone to cool high temperature wall. Through the transient experiment of cryogenic gas atomization jet cool high temperature nickel-base alloy surface with different water dose. The water dose achieving the best cooling effect is 2 ml/min, 4ml/minand 6ml/min under the nickel-base alloy surface temperature at 300 ℃, 500 ℃and 650 ℃. Then the effect of water density to heat transfer coefficient is discussed. Water dose to the best cooling effect must be equivalent to the amount of water that materials can vaporize and participate in the phase-change heat transfer under certain temperature. When achieving optimal cooling effect, the number of fogdrops participating in phase-change heat transfer are the most , and heat transfer coefficient reaches the maximum.
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