Al2O3-water nanofluid heat transfer enhancement of a twin impingement jet

Abstract

Heat transfer enhancement is a prominent field which has tremendous demands in all aspects of life, especially in industry and engineering applications. For this and other unseen reasons, a heat transfer enhancement in twin circular jet was studied experimentally by using Al2O3 water nanofluid for various concentrations (0.05, 0.1, 0.15, 0.2, and 0.25) kg/m3. The current study primarily aimed to clarify the effect of major parameters such as nanoparticle concentrations and nozzles height to diameter (Z/D) of such arrangement on heat transfer enhancement. The validation was conducted thoroughly and it showed acceptable deviation with analogous studies. The obtained results indicated that the maximum increase in Nusselt number comparing to base fluid (water) was observed to be about 200% higher than the base fluid at nanoparticle concentration (φ) οf 0.25 kg/m3, Re=2000 and Z/D=4. While the minimum was about 18% higher than the base fluid and detected at φ=0.05 kg/m3, Re=400, and Z/D=7. Keywords: Nanofluid, Heat transfer, Twin jet, Volume fraction, Al2O3-water, Nusselt number