  Effects of ballistic transport on the temperature profiles and thermal
resistance in nanowires are studied. Computer simulations of nanowires between
a heat source and a heat sink have shown that in the middle of such wires the
temperature gradient is reduced compared to Fourier's law with steep gradients
close to the heat source and sink. In this work, results from molecular
dynamics and phonon Monte Carlo simulations of the heat transport in nanowires
are compared to a radiator model which predicts a reduced gradient with
discrete jumps at the wire ends. The comparison shows that for wires longer
than the typical mean free path of phonons the radiator model is able to
account for ballistic transport effects. The steep gradients at the wire ends
are then continuous manifestations of the discrete jumps in the model.
