Experimental Study of Pool Boiling Characteristic of Al2O3-coated Aluminum Surfaces
J. Environ. Nanotechnol., Volume 14, No 2 (June 2025) pp. 265-273
Abstract
The current study investigates the pool boiling performance of bare Al and Al2O3 nano-coated heating surfaces using refrigerant R-600a. The sol-gel technique was used to prepare Al2O3 nano-coatings. Using scanning electron microscopy, the crystal structure of coated surfaces was examined, and element percentage distribution across the coated surfaces was studied using energy-dispersive spectroscopy technology. The prepared heating surfaces S-100 nm, S-200 nm, and S-300 nm showed a maximum increase in heat transfer coefficient of around 29%, 36%, and 46%, respectively, as compared to plain Al heating surface. The improvement in heat transfer coefficient observed on Al2O3 nano-coated surfaces is primarily attributed to the presence of a high density of nucleation sites and increased surface roughness. This study will become increasingly important in the upcoming years due to the advancement of surface modification in energy conversion regulation and thermal applications.
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