Papers by Author: Xiao Yan Guan

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.

Abstract: Based on the pool film boiling, the paper discusses the heat transfer coefficient of fogdrop jet into cutting zone to cool high temperature wall and then founds the model. It can be concluded by transient test in cryogenic pneumatic mist jet cooling high temperature titanium surface with different water flow, that when reaching the best cooling effect, the water flow of cryogenic pneumatic mist jet cooling as well as the materials vaporizing and involving phase change heat-transfer under certain temperature must be equivalent, and at that time, the heat transfer coefficient of cryogenic pneumatic mist jet cooling will reach the maximum.

Abstract: Enhancing the cooling to spread heat in the process of the material cutting and milling has positive effect on increasing the efficiency of cutting and milling and assuring the apparent mass of test sample cut and milled. Basing on the experiment about the mixture of fixed pressure, fixed air and different quantity of water atomizing jet cooling the Ti alloy, this article discusses performance and regulation of phase transformation heat—transfer of simulating grinding Ti alloy forced air cooling by the mixture of fixed pressure, fixed air and little water.