... of refrigerants and nanolubricants, that is, nanoparticles dispersed in the lubricant oils, have potentials to augment heat transfer exchange effectiveness. However, the nanoparticle mechanisms leading to such heat transfer changes are still unclear and not well included in the models. In this work, an existing...

... was investigated. Nanolubricants containing roughly 10 nm diameter Al 2 O 3 nanoparticles of various volume fractions with a polyolester lubricant were mixed with R134a at two different mass fractions. The study showed that nanolubricants can significantly improve R134a/lubricant boiling on a rectangular finned...