金属铸造界面传热系数的试验研究及其确定

金属铸造凝固过程中,在接触界面间会产生热阻.热阻的大小随空间和时间变化,常常主导着热传导的过程,通常将热阻的影响表示为界面传热系数,在温度场数值模拟中,铸件与铸型间的界面传热系数是关键的参数.利用有限元分析软件ANSYS结合试验数据,模拟了铸造凝固过程的温度场,分别考虑了不同界面传热系数对模拟结果的影响,并将模拟数据与试验结果进行了比较,发现了金属型铸造界面传热系数随时间变化的规律,以及铸件与铸型的接触位置对界面传热系数的影响.

Experimental research on coefficients of interface heat transfer in metals casting and its determination

Thermal resistance could be generated among the contacting interfaces during the solidification course of metal casting.The magnitude of thermal resistance varies along with space and time and frequently dominant the process of heat conductance.The influence of thermal resistance would usually be expressed as the coefficient of interfacial heat transfer.During numerical value simulation of temperature field,heat transfer coefficient of the interface between casting and casting mould is the key parameter.Utilizing finite element analytical software ANSYS and combining the testing data,the temperature field of solidifying process of founding was simulated and the affects of heat transfer coefficient of different interfaces were considered separately.Comparison was carried out on the simulated data with the tested result,thus found out the law of interfacial heat transfer coefficient of metal mould founding that varies along with time and as well as the influence of contacting position of casting and casting mould on the interfacial heat transfer coefficients.