Theoretical Analysis and Experimental Study on Heat-Transfer in Cryogenic gas atomization Jet Cooling Nickel-base Alloy

Based on the 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 cooling 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 degrees C, 500 degrees Cand 650 degrees C. Then the effect of water density to heat transfer coefficient is discussed. It is indicated that the 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 to cool high temperature wall are the most, and the heat transfer coefficient reaches the maximum.