基于稳态法的铝合金-金属铸型界面换热特性实验研究-材料加工工程专业论文.docxVIP

重庆大学硕士学位论文英文摘要 重庆大学硕士学位论文 英文摘要 PAGE PAGE IV ABSTRACT In the computer numerical simulation of casting process, the accuracy of the temperature field numerical simulations is premise in which other fields carries on the accurate simulation. The accurate material properties, initial and boundary conditions are essential to the simulation, It’s difficult to acquire the accurate parameters only by experiments. Especially, one of the boundary conditions that be called interfacial heat transfer coefficient. Its mainly occurs in the solidification process of heat transfer because the metal shrinks during solidification while the mould expands when heated, so an air-gap develops at metal-mould interface that heat can not pass by an ideal state, hence cause a temperature drop between the two surfaces accordingly resulting in a thermal resistance. The reciprocal of a thermal resistance between casting-mould is defined as the interfacial heat transfer coefficient. The interfacial heat transfer coefficient is only comprehensive inflection that the numerous influencing factors. Owing to the complexity of the interfacial heat transfer mechanism, therefore, many researchers in this aspect have not been a satisfactory solution. Moreover, the existing fundamental research to handle heat transmission mechanism with air gap is very still defective, opinions are widely divided. Based on the above situation, this article mainly study heat transfer coefficient applying to steady-state method between the commonly used casting alloy ZL101 and mould steel H13, it’s necessary to choose an small air gap as a breakthrough point and develop a new equipment to study the small air gap when conduct the experimental study. The main work in this subject is embodied as follows: ① The article systematically review the domestic and foreign heat transfer research condition, and summarize some basic viewpoints as well as the research methods in this area. ② This article turn to stud