Configurational temperature profile in confined fluids. II. Molecular fluids

In an earlier paper, we applied configurational expressions of the temperat ure to the calculation of temperature profiles within a confined atomic flu id. This paper focuses on the application of these expressions to confined molecular fluids using ethane and hexane as examples. We first give configu rational expressions for the temperature for these constrained systems. The configurational temperature profiles so obtained are compared to the kinet ic temperature calculated using the equipartition principle, in equilibrium systems. These expressions are then used in nonequilibrium molecular dynam ics (NEMD) simulations of fluids undergoing planar Poiseuille flow. We show that these configurational expressions provide a direct and accurate deter mination of the temperature profile for these systems. (C) 2001 American In stitute of Physics.