Volumetric Properties of Nanofluids by a Perturbed Hard-sphere Chain Equation of State

A perturbed hard-sphere chain equation of state (PHSC) is employed to predict the volumetric properties of some nanofluids containing Co3O4 in ethylene glycol (EG), SnO2 in EG, TiO2-anatase (-A) in EG, TiO2-rutile (-R) in EG, Al2O3 in EG/H2O, Sb2O5-SnO2 in EG/H2O, ZnO in polyethylene glycol (PEG)/H2O and CuO in H2O. Two temperature-dependent parameters in the proposed EoS were expressed in terms of molecular scaling constants  effective hard-sphere diameter, and ε; non-bonded interaction energy. The mentioned scaling constants were correlated with melting temperatures and densities which show the rationality of them. It is also indicated in this study without knowledge of potential energy function can able to illustrate the volumetric properties of nanofluids. Comparisons between the calculated liquid densities and the experimental values over the temperature range from 273.15 to 363.15 K and the pressure range from 0.1 to 45 MPa show that the average absolute deviation is 1.49%.