Thermophysical and Physicochemical Properties

Heat-transfer module

Heat-transfer module is used to determine the heat transfer coefficient at the metal/mould interface from cooling curves of actual casting process. The experimentally determined relationships between temperature and time within the mould and the casting are used in conjunction with finite difference technique to determine the magnitude of heat-transfer characteristics. The method, based on inverse solution, is well conditioned in the sense that it generates bounded solutions and never generates thermal characteristics oscillating with increasing amplitude.

Heat transfer is the driving force in solidification and also has a significant effect on the quality of the cast product. Knowledge of heat transfer phenomena is therefore essential for the improvement of production speed and productivity of the casting process.

The module can also be used to determine the heat transfer coefficient at the interface between two conducting media in other technological processes.

Input data

· Distance of thermocouples from casting/mould interface [m]

· Time step of solidification process [s]

· Input file name; text file; array of input data: maximum 1400 rows

· Type of alloy material

· Type of mould material

Columns of experimental data

· 1st column: Time [s]

· 2nd column: Temperature data at the location of Sensor 1 in mould [°C]

· 3rd column: Temperature data at the location of Sensor 2 in mould [°C]

· 4th column: Temperature data at the location of Sensor 3 in mould [°C]

· 5th column: Temperature data at the location of Sensor 4 in mould [°C]

· 6th column: Temperature data at the location of Sensor 0 in melt [°C]

Note: Columns are separated by space. Five sensors are needed to gather temperature data.

Condition

· Distance of sensors from casting/mould interface must satisfy condition:
Sensor0 < Sensor1 < Sensor2 < Sensor3 < Sensor4

Output data

· Heat transfer coefficient [W/m²K] as a function of time or temperature