ln(mu) = sum_i=1^N(a[i]*ln(T)^(i-1))
    ln(kappa) = sum_i=1^N(b[i]* ln(T)^(i-1))

Based on patch provided by Armin Wehrfritz

Resolves feature-request http://www.openfoam.org/mantisbt/view.php?id=978