Prediction of nanofluids properties: the density and the heat capacity

• Published in: Journal of physics. Conference series 2017-11, Vol.891 (1), p.12347
• Main Authors: Zhelezny, V P, Motovoy, I V, Ustyuzhanin, E E
• Format: Article
• Language: English
• Subjects: Additives; Aluminum oxide; Ambient temperature; Density; Mathematical analysis; Molar volume; Nanofluids; Nanoparticles; Photon correlation spectroscopy; Physics; Specific heat
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/891/1/012347

The results given in this report show that the additives of Al2O3 nanoparticles lead to increase the density and decrease the heat capacity of isopropanol. Based on the experimental data the excess molar volume and the excess molar heat capacity were calculated. The report suggests new method for predicting the molar volume and molar heat capacity of nanofluids. It is established that the values of the excess thermodynamic functions are determined by the properties and the volume of the structurally oriented layers of the base fluid molecules near the surface of nanoparticles. The heat capacity of the structurally oriented layers of the base fluid is less than the heat capacity of the base fluid for given parameters due to the greater regulation of its structure. It is shown that information on the geometric dimensions of the structured layers of the base fluid near nanoparticles can be obtained from data on the nanofluids density and at ambient temperature - by the dynamic light scattering method. For calculations of the nanofluids heat capacity over a wide range of temperatures a new correlation based on the extended scaling is proposed.