Experimental Study on Cryogenic Gas Atomization Jet Cooling Difficult-to-Cut Material

Abstract

Based on pool film boiling, the model of boiling and vaporization to heat transfer is established When droplet jet into cutting zone to cool high temperature wall. Through the transient experiment of cryogenic gas atomization jet cooling high temperature nickel-base alloys and Titanium alloys surface with different water dose. The water dose achieving the best cooling effect is obtained at different temperature on surface of Nickel based alloys and TI-alloy. 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 amount of droplets participating in phase change heat transfer to cool high temperature wall are the most , while comparing the cold air cooling effect and spraying cooling effect at low and high temperature. Result is that either low or high temperature, spraying cooling effect is superior than cold air cooling effect, but at a specific temperature, no lower the temperature of air, the better cooling effect, there is also an optimal air temperature values.