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Influence of Nanofluid Instability on Thermodynamic Properties near the Critical Point

Published

Author(s)

Joe W. Magee, Nikolai Polikhronidi, Rabiyat Batyrova, Ilmutdin Abdulagatov

Abstract

Thermodynamic properties (isochoric heat capacity, critical and phase transition temperatures, pressure and thermal-pressure coefficient) of nanofluid (2-propanol+TiO2) were experimentally studied near the critical point of the pure base fluid (2-propanol). Measurements were made using a high-temperature, high-pressure, nearly constant-volume adiabatic piezo-calorimeter that was designed for simultaneous measurements of caloric (C_vVT) and density (PVT) properties for pure fluids along the near-critical isochores as a function of temperature in the two- and single-phase regions. The combined expanded (k = 2) uncertainty of the density, temperature, pressure, thermal- pressure coefficient, and heat capacity measurements at the 95 % confidence level is estimated to be 0.2 %, 15 mK, 1.0 %, 2 %, and 3 %, respectively. The measurements were made along a selected near- critical isochore of 282.68 kg·m-3 for a concentration of 0.132 wt. % of TiO2 in the temperature range from (314 to 511) K. The measured C_v and critical temperature data were interpreted in terms of finite-size scaling theory of critical phenomena for fluids confined in the finite-size media. The influence of finite-size on the thermodynamic properties of the near- and supercritical fluid has been studied, along with thermal instability of the nanofluid (2-propanol+TiO2) at high temperatures (around 500 K).
Citation
Journal of Chemical Thermodynamics

Keywords

adiabatic calorimeter, critical point, isochoric heat capacity, finite-size scaling, nanofluids, 2-propanol, titanium dioxide

Citation

Magee, J. , Polikhronidi, N. , Batyrova, R. and Abdulagatov, I. (2018), Influence of Nanofluid Instability on Thermodynamic Properties near the Critical Point, Journal of Chemical Thermodynamics, [online], https://doi.org/10.1016/j.jct.2018.12.009 (Accessed February 11, 2025)

Issues

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Created December 6, 2018, Updated February 4, 2025