In this paper we present the results of nonequilibrium molecular dynamics simulations of an
atomic fluid undergoing planar Poiseuille flow through a narrow slit pore. In particular we
examine the heat flux vector for such a fluid and find that it displays weak oscillations with
wavelengths that are characteristic of the van der Waals particle diameter. Furthermore, we
examine the possibility of a coupling of the heat flux vector with the gradient of the square of
the strain rate tensor and find that if such a coupling exists it would be undetectable by an …