Using the home made device, the relationship between the 3ω voltage and the heating frequency is obtained by Lock-in Amplifier, thus the thermal conductivity of the fluid is calculated with the least square fit method.
Using the home made device, the relationship between the 3ω voltage and the heating frequency is obtained by Lock-in Amplifier, thus the thermal conductivity of the fluid is calculated with the least square fit method.
自行研制了流体导热系数的测量装置，采用锁相放大器获取3ω电压与频率的关系，并借助最小二乘法，算出待测试样的导热系数。