Enhanced thermal properties of nanodiamond nanofluids

Abstract Nanodiamond (ND) particles dispersed in ethylene glycol/water mixtures have been reported for their thermal properties and potential heat transfer applications. Commercially available ultra-dispersed diamond soot was treated with sulfuric acid⿿nitric acids to form single ND particles ⿿ characterized by various techniques ⿿ then prepared ND nanofluids and then measured thermal conductivity and viscosity by experimentally. The enhanced thermal conductivity for 1.0% of ND/20:80, ND/40:60 and ND/60:40 nanofluids is 17.8%, 14.2% and 11.4%; enhanced viscosity is 2.74-times, 1.73-times and 1.92-times at temperature of 60 °C, respectively. The heat transfer benefits of ND nanofluids in laminar to turbulent flow have been analyzed theoretically by using thermal properties.

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