New version of Tammann-Tait equation: Application to nanofluids

摘要

It has been one hundred years, since Tammann-Tait equation was widely employed to correlate high-pressure density behaviour of liquids against the temperature. Nevertheless, in the case of suspensions containing dispersed nanoparticles, called nanofluids, the applicability of above-mentioned equation is limited to the fitting of numerous coefficients at any nanoparticle concentration of interest This paper aims to overcome this problem through developing a Tammann-Tait like equation, in which the number of adjustable coefficients is reduced by introducing a nanoparticle concentration-dependent function to the original scheme. High pressure densities of some ethylene glycol, water, and ethylene glycol + water-based nanofluids were predicted using new version of Tammann-Tait equation over the temperature range within 273-363 K and pressures up to 45 MPa. From 1215 data points examined, the AARD of the correlated and predicted densities from the experimental values was found to be 0.061%. The thermodynamic coefficients of studied nanofluids were also estimated by the proposed equation. (c) 2016 Elsevier B.V. All rights reserved.