SURFACE TENSION, VISCOSITY, AND THERMAL CONDUCTIVITY OF NANOLUBRICANTS AND VAPOR PRESSURE OF REFRIGERANT/NANOLUBRICANT MIXTURES
DOI:
https://doi.org/10.15587/1729-4061.2012.4566Keywords:
refrigerant/lubricant mixture, thermophysical properties, saturated vapor pressure, nanoparticles, nanolubricant.Abstract
The results of thermophysical property and vapor-liquid equilibria studies for the systems mineral oil ISO 9 + MoS2 (70 nm) and Cu (50 nm) nanoparticles, and R600a + nanolubricant are presented. Series of measurements: surface tension (maximum bubble pressure method), thermal conductivity (steady-state hot-wire method), viscosity (capillary tube method), and saturated vapor pressure (static method) were carried out. The size and the concentration of nanoparticles in the lubricant were determined by dynamic light scattering (laser correlation spectroscopy). Experimental data demonstrate some positive effect of nanoparticles doping on the refrigerant properties such as the decreasing of nanolubricant surface tension, thermal conductivity growth, and the shift of vapor pressure curve in refrigerant/lubricant blends. Thus, the use of nanorefrigerants shows clearly the energy efficiency enhance for the vapor compression refrigerating systems.References
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Copyright (c) 2014 Dmitry Nikitin, Vitaly Zhelezny, Vadym Grushko, Dmytro Ivchenko
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