Abstract Recently, Rice University of the United States has developed a heat transfer application of mineral oil doped with diamond nanoparticles, which is better than general thermal fluids. The research results were published in the American Chemical Society Journal Applied Materials and Interfaces. ...
Recently, Rice University of the United States has developed a mineral oil heat transfer application with diamond nanoparticles, which is better than general thermal fluids. The research results were published in the American Society of Chemistry journal Applied Materials and Interfaces . 
Mineral oil doped with nanodiamonds is better than other general nanofluids in heat transfer applications, shown as 0.1% strength nanodiamond mineral oil.
Rice's research team incorporated 6 nanometers of diamond into mineral oil at very low concentrations, and then tested the thermal conductivity of the nanofluid and the temperature-viscosity relationship. The results show that this new type of thermal fluid is better than those containing oxides, nitrides, carbide ceramics, metals, semiconductors, carbon nanotubes and other composite materials.
Thermal control is critical to equipment maintenance and operation, while thermal fluids can be used to reduce wear between components, stamping and drilling wear during machining operations, as well as power transmission systems, solar cells, air conditioning, microelectronics, and A range of applications from engines to nuclear reactors, such as nanoelectromechanical systems and cooling systems.
The thermal fluid used in equipment generally requires some properties to maintain heat transfer during the flow process. Fluids such as water and ethylene glycol have good fluidity but are not thermally conductive; while some conventional thermal fluids are susceptible to Its stability, viscosity, surface charge, fluid stratification, solidification and agglomeration and other factors.
Scientists have been exploring new and effective thermal fluid materials since the 1990s, trying to incorporate 100 mesh fine nanoparticle materials into mineral oil at just enough concentration, without affecting fluid flow and maintaining thermal conductivity. . Continuous experimentation has finally made scientists successful. The choice of nanodiamond materials makes the thermal conductivity of new thermal fluids 100 times higher than that of copper thermal fluids.
Diamond nanoparticles suspended in mineral oil under an electron microscope are shown as diffractive faces of diamond nanoparticles.
In the experiment, the researchers evenly sprinkled the nano-diamond into the mineral oil. It was found that only 0.1% of the diamond fluid increased the heat transfer efficiency by 70% at 211 degrees Fahrenheit; in the comparison group, the same concentration of the diamond hot fluid at the low temperature Although the heat transfer efficiency is not as good as the former, it has also increased by nearly 40%.
Taha-Tijerina added that Brownian motion and nanoparticle-fluid interaction play an important role in nanodiamond thermal fluid experiments. The phenomenon that suspended particles never stop moving irregularly is called Brownian motion. The higher the temperature, the more Brownian motion obvious. In the experiment, the increase of temperature and the increase of nano-diamond concentration significantly enhanced the heat transfer effect of the hot fluid, which proves that the thermal conduction of nano-diamond mineral oil is not only related to the seepage mechanism, but also affected by Brownian motion. (Compiled from 'Diamonds are an oil's best friend')
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