Measurements of thermophysical properties of liquid metals relevant to Marangoni effects
Measurements of thermophysical properties of liquid metals relevant to Marangoni effects
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DOI：
10.1098/rsta.1998.0191
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发表时间：
1998-04-15
期刊：
影响因子：
5
通讯作者：
Lohofer, G
中科院分区：
文献类型：
--
作者：
Egry, I;Langen, M;Lohofer, G
Marangoni对流是由表面张力沿自由液面的梯度沿着引起的。控制对流强度的无量纲Marangoni数包含其他热物理参数。对于液态金属，这些量最好在无容器条件下使用电磁悬浮和非接触式诊断工具进行测量。在微重力下，小的电磁场足以定位液体样品。有些实验只能在这样的环境中进行，大多数其他实验都大大受益于微重力，并导致更高精度的结果。本文报告了过冷液态金属热物理性质的地面和微重力测量，包括比热、密度、表面张力、粘度和电导率。
Marangoni convection is caused by a gradient in the surface tension along a free liquid surface. The dimensionless Marangoni number, which controls the strength of this convection, contains additional thermophysical parameters. For liquid metals, these quantities are best measured under containerless conditions using electromagnetic levitation and non-contact diagnostic tools. In microgravity, small electromagnetic fields are sufficient to position a liquid sample. Some experiments can only be performed in such an environment, most others greatly benefit from microgravity and lead to results of higher precision. This paper reports on both terrestrial and microgravity measurements of thermophysical properties of undercooled liquid metals, including specific heat, density, surface tension, viscosity and electrical conductivity.