Thermal and Hydraulic Performances of Carbon and Metallic Oxides-Based Nanomaterials

Abstract

For companies, notably in the realms of energy and power supply, the essential requirement for highly efficient thermal transport solutions has become a serious concern. Current research highlighted the use of metallic oxides and carbon-based nanofluids as heat transfer fluids. This work examined two carbon forms (PEG@GNPs & PEG@TGr) and two types of metallic oxides (Al2O3 & SiO2) in a square heated pipe in the mass fraction of 0.1 wt.%. Laboratory conditions were as follows: 6401 ≤ Re ≤ 11,907 and wall heat flux = 11,205 W/m2. The effective thermal–physical and heat transfer properties were assessed for fully developed turbulent fluid flow at 20–60 °C. The thermal and hydraulic performances of nanofluids were rated in terms of pumping power, performance index (PI), and performance evaluation criteria (PEC). The heat transfer coefficients of the nanofluids improved the most: PEG@GNPs = 44.4%, PEG@TGr = 41.2%, Al2O3 = 22.5%, and SiO2 = 24%. Meanwhile, the highest augmentation in the Nu of the nanofluids was as follows: PEG@GNPs = 35%, PEG@TGr = 30.1%, Al2O3 = 20.6%, and SiO2 = 21.9%. The pressure loss and friction factor increased the highest, by 20.8–23.7% and 3.57–3.85%, respectively. In the end, the general performance of nanofluids has shown that they would be a good alternative to the traditional working fluids in heat transfer requests.

Heat Transfer and Fluids Properties of Nanofluids

“…The evaluation of the convective heat transfer performance of nanofluids is very crucial for their thermal management applications, particularly as advanced cooling media. In this regard, Afan et al [ 10 ] reported a forced convection study on the thermal and hydraulic performances of nanofluids containing carbon (graphene nanoplatelets (GNPs) and thermally treated graphene (T-Gr)) and two oxides (Al 2 O 3 and SiO 2 ) nanoparticles in pentaethylene glycol (PEG) in a fully developed turbulent flow in a square, heated pipe. The thermal and hydraulic performances of these nanofluids were evaluated in terms of pumping power, performance index (PI), and performance evaluation criteria (PEC).…”