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- Experimental study on the density of graphene nanofluid: effects of concentration, temperaturePublication . Vilão, G.; Soares, F.; Ramos, C.A.; Iglesias, T.P.(Introduction) Thermal and physical properties of fluids are crucial factors in the design and development of heat transfer equipment that operates with high efficiency. These properties determine how effectively a fluid can transfer heat, how it behaves under different temperatures and pressures, and its overall performance in heat exchange processes. The density of fluids is an essential physical-chemical property that plays a vital role in mass and heat transfer. The experimental values of the density compared to the initial models existing in the literature present significant deviations, this difference increasing with the increase of the volume fraction. The most used model for calculating density is the mixture model of Pak and Cho [1], however, this equation is still an approximation. As the density of the nanofluid is affected by numerous factors, one of which is the shape and size of the nanoparticle, we will present the study considering this factor [2].
- Behavior of dielectric permittivity in squalane Graphene Nanofluid at 333.15KPublication . Vilão, G.; Ramos, C.A.; Iglesias, T.P.(Introduction) The global demand for energy is constantly growing, requiring the development of efficient systems to ensure sustainable consumption and prevent long-term environmental damage. Carbon-based materials, such as graphene, have been extensively studied due to their environmentally friendly properties, structure, and availability. Squalane is also a component with significant physiological effects in fields like nutrition, pharmacy, and medicine [1]. However, both graphene and squalane are relatively new in the field of nanofluids. While research on thermal conductivity has been prioritized, studies on permittivity and electrical conductivity remain limited. In this study, we analyzed the dielectric permittivity of graphene nanofluid at temperatures of 333.15K and 343.15K. The nanofluid was prepared using squalane as base fluid with a volumetric concentration of 0.75% of graphene nanoparticles, without adding surfactants to avoid interference.