Heat transfer during quenching in graphene and multiwall carbon nanotubes nanofluids under agitated quench conditions

Abstract

Distilled water and aqueous graphene nanofluids of concentrations 0.01, 0.1 and 0.3 vol.% and MWCNT nanofluids of 0.0003, 0.003 and 0.3 vol.% were used as quench media and studied their heat transfer characteristics. ISO 9950 inconel metal probe was used to obtain the thermal history during quenching. The quenching media were agitated in a standard Tensi agitation system at impeller speeds of 0, 500, 1000 and 1500 rpms. Spatiotemporal heat flux was obtained by inverse heat conduction method. The rewetting characteristics of nanofluids were obtained and compared with distilled water. Heat transfer analysis showed highest mean heat flux of 3.23 MW/m2 and fastest heat extraction with 0.1 vol.% graphene nanofluid. © 2019 by American Scientific Publishers.