Naslov
Thermal properties of nanofluids based on PAO 4 base oil

Autori
Vidović, Elvira ; Faraguna, Fabio ; Stublić, Krešimir ; Jukić, Ante

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Lubricants 2015 Book of Abstracts / Croatian Society for Fuels and Lubricants Symposium Proceedings / Jukić, Ante - Zagreb : GOMA - Hrvatsko društvo za goriva i maziva, 2015, 48-P-8

ISBN
978-953-97942-6-0

Skup
48th Lubricants and Base Oils Symposium

Mjesto i datum
Rovinj, Hrvatska, 14.10.2015. - 16.10.2015

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
nanofluids; PAO base oil; thermal properties

Sažetak
One way to improve the efficiency of the cooling process streams is to improve the thermal properties of cooling fluids which results in improving the overall efficiency of production processes. In this work we studied nanofluids based on PAO 4 oil with multiwall carbon nanotubes (MWCNTs) and with different surfactants (PAT). After choosing the most compatible surfactant (PD), properties of nanofluids prepared with PD concentrations: 0.1, 0.5 and 1 wt. % are investigated. The concentration of MWCNT was varied as well (0.0023 to 1 wt. %). Prepared nanofluids are examined regarding their stability, viscosity, and contact angle between the solid-liquid-gas phases, tribological wear properties and thermal conductivity. The transfer of heat is a complex mechanism that involves conduction and convection. In the prepared nanofludis the convection was measured, which is characteristic for the moveing fluids and heat exchange between the fluid and solid phase. Contrary to expectation, by measuring the thermal conductivity of the samples the decrease in thermal conductivity of MWCNTs was observed ranging from 3 % to 40 %. Reason for reducing the thermal conductivity is likely inadequate length of MWCNTs. Furthermore, it was found that the present PD (shares 0.5 and 1.0 wt. %) increases the viscosity of the PAO 4 oil. Because of the chemical compatibility of the PD with PAO 4 oil and with metal surface, the addition of the PD to the oil reduces the contact angle at the metal-liquid-air interface.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA