The formula for measuring thermal conductivity by calorimeter is used to determine the test parameters that affect the test results. The influence of the water flowrate per unit time of the central calorimeter and the temperature difference between the cold and hot surfaces of the sample on the thermal conductivity is verified through the test. The test shows that the thermal conductivity of the sample increases with the rise of water flowrate per unit time of the central calorimeter at the test temperature. However,when the water flowrate per unit time of the central calorimeter exceeds a certain value,the increase trend of the thermal conductivity slows down. The thermal conductivity measured by the calorimeter is related to the temperature difference between the cold and hot surfaces of the sample. The thermal conductivity within the curve range or at the extrapolated temperature can be calculated by the fitted curve between the thermal conductivity and Δt/ΔT.
关键词
水流量平板法/热导率/冷热面温差/测试条件
Key words
Calorimeter/Thermal conductivity/Temperature difference between cold and hot surfaces/Test conditions
维普
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