Jpn. J. Appl. Phys. 45 (2006) pp. 6455-6461 |Previous Article| |Next Article| |Table of Contents|
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Development of Hot-Disk Sensor for Molten Metal, and the Thermal Conductivity Measurement of Molten Bismuth and Tin using Hot-Disk Method
National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
(Received February 2, 2006; accepted April 19, 2006; published online August 4, 2006)
The thermal conductivities of molten bismuth and tin were measured using the hot-disk method. A hot-disk sensor was made of molybdenum foil (thickness, 20 µm; radius of sensor region, 3.05 mm) cut in a conducting pattern and placed between two aluminum nitride plates (plate thickness, 0.05 mm). Aluminum nitride did not corrode because of its contact with a molten metal and thus the molybdenum foil was protected from the molten metal. The thermal conductivities of molten bismuth and tin were measured during a short-duration of microgravity using a 10 m drop tower, to confirm the thermal convection effect during the measurement. The thermal conductivities measured in normal gravity were found to be approximately equal to those measured during the microgravity (during microgravity, thermal convection is suppressed), up to 977 K. Moreover, at 1083 K, normal gravity results were found to be higher than microgravity results.
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