Intuitively I would expect the thermal and electric conductivity to be positively related, and since electric conductivity increases with salinity, so should thermal. But according to this table (p.10) it decreases. Why is this?
Related: is there such a thing as the Wiedemann-Franz law for liquids like water?
There's a paper that has theoretical derivations about it, but it's nowhere to be found:
Predvoditelev, A. S., "Some invariant Quantities in the Theories of Heat Conductance and the Viscosity of Liquids," Russian Journal of Physical Chemistry, Vol. 22, p. 339 (1948)