This function returns the thermal conductivity. The expression is obtained from Ramires et al. (1995).
Ramires, Maria L. V. and Nieto de Castro, Carlos A. and Nagasaka, Yuchi and Nagashima, Akira and Assael, Marc J. and Wakeham, William A. Standard Reference Data for the Thermal Conductivity of Water. Journal of Physical and Chemical Reference Data, 24, p. 1377-1381, 1995. DOI:10.1063/1.555963.