What is it about?
Hybrid nanofluids are novel fluids that can be prepared by suspending various kinds of nanoparticles in a base fluid. In this paper, various syntheses of Au with Ag, TiO2, Al, and Ni nanoparticles are prepared and employed in some sets of experiments to investigate effects of pressure and nanoparticle type and concentration on heat of evaporation of the fluid. The experiments are implemented at temperatures ranging from 90 to 155°C and solid volume fraction range of 0–3%. Experiments indicate that effects of hybrid nanofluids in increasing the latent heat of evaporation can be sensible at high pressures. The maximum variation in the magnitude of latent heat of evaporation for the Au-based hybrid nanofluid is about 26.9% corresponding Au-TiO2 synthesis.
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Why is it important?
Some of the specific applications of nanofluids are in engine cooling and transmission oil, diesel electric generators as jacket water coolants, boiler exhaust flue gas recoveries, heating and cooling of buildings, cooling of electronics, cooling of welding, transformer cooling oils, nuclear systems cooling, solar water heating, drilling, refrigeration, high-power lasers, microwave tubes, biomedical applications, lubrications, thermal storage, and drag reductions.
Perspectives
An interesting advantage of using nanofluids for heat transfer applications is the ability to alter their properties. That is, the thermal conductivity and surface wettability, for example, can be adjusted by varying the particle type and concentration in the base fluid, hence allowing nanofluids to be used for a variety of different applications. However, it is also important to note that the addition of nanoparticles to a base fluid also changes the viscosity, density, and even the effective specific heat; these properties also have a direct effect on the heat transfer effectiveness.
mehdi mashayekhi
Read the Original
This page is a summary of: Evaporative Behavior of Gold-Based Hybrid Nanofluids, Journal of Thermophysics and Heat Transfer, October 2017, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/1.t5220.
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