Experimental Study of Pool Boiling Enhancement Using a Two-Step Electrodeposited Cu-GNPs Nanocomposite Porous Surface With R-134a

The fabrication of porous metallic composite coating on the heating surface to improve pool boiling heat transfer (BHT) performance has received significant attention in recent years. In this work, Cu-GNPs nanocomposite coatings, which were prepared on a copper substrate using various current densities through a two-step electrodeposition technique, were used as heating surfaces to study the pool BHT performance of refrigerant R-134a. The surface morphology, elemental composition, thickness, surface roughness, and porosity of prepared Cu-GNPs nanocomposite coatings are studied and presented in detail. All Cu-GNPs nanocomposite coated surfaces exhibited improved boiling performance compared to the plain Cu surface. The heat transfer coefficient (HTC) values for Cu-GNPs nanocomposite coated Cu surfaces prepared at 0.1, 0.2, 0.3, and 0.4 A/cm(2) were improved up to 1.48, 1.67, 1.82, and 1.97, respectively, compared with the plain Cu surface. The enhancement in the HTC is mainly associated with the increase in surface roughness, active nucleation site density, and micro/nanoporosity of the heating surface.

Automated summary

Porous metallic composite coatings have been fabricated on heating surfaces to improve pool boiling heat transfer performance. Cu-GNPs nanocomposite coatings prepared using different current densities exhibited enhanced boiling performance compared to plain Cu surfaces, attributed to increased surface roughness, active nucleation site density, and micro/nanoporosity.