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In this experimental study the thermal conductivity of a new hybrid nanofluid formulated fromthe additionof nanoparticles of alumina (Al203) and multi walled carbon nanotubes (MWCNTs) in POE oil was investigated. Nanoparticles of Al203 and MWCNTs were dispersed in POE oil at the mass ratio of 50/50 with gravimetricconcentrations of 0.10 g / L, 0.25 g / L, 0.50 g / L and 1.00 g / L. The hybrid nanofluids MWCNTs-Al2O3/POEweresubjected to ultrasonic sonication processes with immersion probe and rotating magnetic stirring toimprovestability. The thermal conductivity was measured at temperatures of 20 °C to 50 °C. The thermal conductivityof thehybrid nanofluid at the concentration of 1.00 g / L was slightly higher than the base fluid (POE oil) throughout thetemperature range.

Autores: Cleiton Rubens Formiga Barbosa Júnior – cleitonformiga@gmail.com

Universidade Federal do Rio Grande do Norte, Departamento de Engenharia Mecânica

Thiago da Silva André – thiagoandreengmec@hotmail.com

Instituto Federal de Educação Tecnológica do Rio Grande do Norte

Francisco de Assis Oliveira Fontes – franciscofontes@uol.com.br

Universidade Federal do Rio Grande do Norte, Departamento de Engenharia Mecânica

Cleiton Rubens Formiga Barbosa – crfb2019@gmail.com.br

Universidade Federal do Rio Grande do Norte, Departamento de Engenharia Mecânica

Ângelo Roncalli Oliveira Guerra – profroncalli@gmail.com

Universidade Federal do Rio Grande do Norte, Departamento de Engenharia Mecânica