Abstract
Experimental determination of the thermophysical properties (thermal
and electrical conductivity, viscosity, and surface tension) of
lithium iodide was carried out in the temperature range starting
slightly above the melting point and extending to about 950 K. These
measurements are motivated by the search for a transparent
substance, the Prandtl number Pr of which approaches or is even less
than unity, and which shows a stable Marangoni effect with respect
to potential contamination of the melt. Such a combination of
material properties is mandatory in the attempt of physical
modelling of laser welding processes where optical access to the
bulk of the fluid is needed in order to measure the flow field. In
an extension to these basic studies, the electrical conductivity and
the influence of the admixture of other iodides on Pr was also
studied.
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