 |
The transient hot-wire technique (THW) has been applied very successfully to the measurement of the thermal conductivity of melts. The sensor is composed of two platinum wires, coverred by a thick layer of alumina on both sides (0.3 mm thick). The sensor is lowered in the melt. Solving the full theoretical equations for this exact geometry enables the absolute determination of the thermal conductivity with a very low uncertainty. At low times the heat wave sees only the alumina. Thus the properties of the alumina are obtained by FEM. Consequently at longer times, FEM modelling produces the thermal conductivity of the melt. |
Peralta-Martinez M.V. Assael M.J., Dix M., Karagiannidis L., Wakeham W.A., “A Novel Instrument for the Measurement of the Thermal Conductivity of Molten Metals. Part I. Instrument’s Description”, Int. J. Thermophys. 27:353-375 (2006) Peralta-Martinez M.V. Assael M.J., Dix M., Karagiannidis L., Wakeham W.A., “A Novel Instrument for the Measurement of the Thermal Conductivity of Molten Metals. Part II. Measurements”, Int. J. Thermophys. 27:681-699 (2006). Sakonidou E.P., Assael M.J., Nieto de Castro C.A., van den Berg H.R., and Wakeham W.A., "A Review of the Experimental Data for the Thermal Properties of Liquid Mercury, Gallium and Indium", Thermal Conductivity 24:516-530 (1999). Assael M.J., Dix M., Drummond I., Karagiannidis L., Lourenco M.J., Nieto de Castro C.A., Papadaki M., Ramires M.L., van den Berg H. and Wakeham W.A. "Towards Standard Reference Values for the Thermal Conductivity of High Temperature Melts", Int.J.Thermophys. 18:439-446 (1997).