Structure and dynamics of nanofluids: Theory and simulations to calculate viscosity

The simplified expression of the Pozhar-Gubbins (PG) rigorous, nonequilibri um statistical mechanical theory of dense, strongly inhomogeneous fluids is used to calculate the viscosity of model fluids confined in a slit pore of several molecular diameters in width in terms of the equilibrium structure factors (i.e., the number density and pair correlation functions) of these nanofluids obtained by means of the equilibrium molecular dynamic simulati ons. These results are compared to those obtained by means of the nonequili brium molecular dynamic simulations of the planar Poiseuille flow of the mo del nanofluids, and to the results supplied by several heuristic expression s for the nanofluid viscosity. This comparison proves that the PG transport theory provides a reliable, quantitatively accurate description of the vis cosity coefficients of the model nanofluids while all the heauristic approa ches fail. This success of the PG prediction of the nanofluid viscosity is because the theoretical expression accounts accurately for the nanofluid st ructure.