Tada Y, Harada M, Tanigaki M, Eguchi W
Institute of Atomic Energy, Kyoto University, Uji, Kyoto, Japan.
Rev Sci Instrum. 1978 Sep;49(9):1305. doi: 10.1063/1.1135573.
A laser flash method developed for the measurement of thermal conductivity of solids was applied to liquids of low thermal conductivity. The sample liquid was sandwiched in between a small thin metal disk and a sample holder. When the laser beam is absorbed in the front surface of the metal disk, the temperature of the disk quickly rises about 2 K and heat then flows downwards through the sample liquid as one-dimensional heat flow. The thermal conductivity of liquid can be obtained from the temperature fall of the disk without employing any reference materials and also without measuring the thickness of the sample liquid layer. Thermal conductivities of water and toluene near room temperature were measured by this method with a mean deviation of 2.6%. This laser flash method may be applied to the measurement of the thermal conductivity of liquids such as molten salts at elevated temperatures.
一种为测量固体热导率而开发的激光闪光法被应用于低导热率的液体。样品液体夹在一个小的薄金属盘和一个样品架之间。当激光束被金属盘的前表面吸收时，盘的温度迅速上升约2K，然后热量作为一维热流向下通过样品液体。液体的热导率可以从盘的温度下降中获得，而无需使用任何参考材料，也无需测量样品液体层的厚度。用这种方法测量了室温附近水和甲苯的热导率，平均偏差为2.6%。这种激光闪光法可应用于测量高温下的液体如熔盐的热导率。
