Measuring thermal conductivity of low-melting point solids based on hot-strip method
The steady-state method of thermal conductivity measurement has the clarity of experi-mental principle but takes a long time and is inconvenient to test materials with a low-melting point.To achieve the effective thermal conductivity measurement of such sample,an attempt was made to develop a transient thermal conductivity tester based on hot-strip method,which utilized a metal strip(so called hot-strip)not only as a heating source but also as a temperature detector.An experimental platform including a testing circuit and a refrigerating system was constructed,and the experimental data were processed by Gauss-Newton iterative method.The result of the property test showed that the hot-strip had a high linearity in sensing property;only around 30 s was taken for each test;tem-perature from-15～0 ℃ in testing area was provided,thus some materials with low-melting point could be tested.The measures to reduce the deviation of thermal conductivity measurement were given from the heat absorption of hot-strip heat capacity,heat dissipation of hot-strip end and temperature drift of matching resistance.
thermal conductivityhot-strip methodlow-melting point solid
万方数据
维普
