  We present an algebraic model for turbulent scalar-flux vector that stems
from tensor representation theory. The resulting closure contains direct
dependence on mean velocity gradients and on frame rotation tensor that
accounts for Coriolis effects. Model coefficients are determined from Direct
Numerical Simulations (DNS) data of homogeneous shear flows subjected to
arbitrary mean scalar gradient orientations. This type of tuning process
renders the proposed model to be objective towards inhomogeneous applications.
Model performance is evaluated in several heated channel flows in both
stationary and rotating frames, showing good results. To place the performance
of the proposed model into context, we compare with Younis algebraic model,
which is known to provide reasonable predictions for several engineering flows.
