高温电加热下电阻率与导热系数随温度变化的传热过程模拟

The Heat Transfer Process Simulation of the Resistivity and Thermal Conductivity Changing with the Temperature under High Temperature Electric Heating

高温、电加热条件下电阻率与导热系数随温度变化明显,因此研究在此条件下的热传导具有十分重要的意义。运用MATLAB中的PDE工具箱,对高温条件下,几种不同材料的发热导体电加热过程中导热系数、电导率变化所引起的导热等问题进行了数值求解。结果表明:当发热导体半径>5cm时,温度的变化对发热导体的导热系数和电导率影响显著。

It is obvious that both resistivity and thermal conductivity change with the temperature under high temperature electric heating condition. So that it is impotant to study the heat conduction at this condition. The heat conduction case caused by changing of thermal conductivity and electric condnctivity in the process of electric heating for some different electric heater using the PDE tool box in MATLAB has been calculated. The result shows that the changing of temperature seriously exerts influence on the thermal conductivity and electric conductivity of the electric heater when the electric heater radius is bigger than 5cm.