LASER FLASH THERMAL DIFFUSIVITY DETERMINATION PROCEDURE FOR HIGH-TEMPERATURE LIQUID METALS
作者:
Jennifer Murphy,
Yildiz Bayazitoglu,
期刊:
Numerical Heat Transfer, Part A: Applications
(Taylor Available online 1992)
卷期:
Volume 22,
issue 1
页码: 109-120
ISSN:1040-7782
年代: 1992
DOI:10.1080/10407789208944761
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A method is proposed for determining the thermal diffusivity of high-temperature liquid metals by levitating a small sample in microgravity conditions, melting it, and predicting Us response to a laser pulse. The solution is obtained by determining the initial temperature distribution in the thermal penetration depth created by the laser pulses and then solving the two-dimensional conduction equation in spherical coordinates for the cooling history of the droplet. The solution is obtained by assuming a short duration for the experiment. The correct diffusivity is obtained by minimizing the difference between the predicted and the experimentally obtained temperatures. The method is demonstrated for nickel, iron, and copper using analytical data, and is shown to have good accuracy.
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