Abstract
This work aimed to develop a new empirical model for density and derived properties of nanofluids using a new empirical equation based on Pack-Cho scheme. The previously developed Tammann-Tait based model by the author has suffered a mathematical drawback to properly represent isothermal compressibility and isobaric expansivity confident values with respect to the nanoparticle fraction. Then, that drawback has been fixed through the above-mentioned approach. The base fluid contributions were obtained from Tammann-Tait equation of earlier work, whereas the nanoparticle contribution was expressed in terms of both fraction and density of nanoparticle as well as some binary parameter. High-pressure densities of 8 nanofluids based on ethylene glycol, poly ethylene glycol, water, poly ethylene glycol + water and ethylene glycol + water were correlated using the new empirical equation mentioned above in 273–363 K range and pressures up to 45 MPa. From 2115 data points examined, the AARD of 0.049% was obtained. The derived thermodynamic coefficients of studied nanofluids were also estimated by the proposed approach. Finally, results of the present empirical model have also been compared with the earlier work and Tammann-Tait type equations of literature, as well.