Backward-facing step heat transfer of the turbulent regime for functionalized graphene nanoplatelets based water-ethylene glycol nanofluids
Document Type
Article
Publication Date
1-1-2016
Abstract
Herein, an experimental study on thermo-physical properties of ethylene glycol-functionalized graphene nanoplatelets/water-ethylene glycol nanofluids (EGGNP-WEG) and a numerical study on the convective heat transfer over a backward-facing step are performed. Accordingly, EGGNP was first synthesized covalently to achieve a stable colloidal solution in water-ethylene glycol mixture. Some characterizations were applied to analyze the surface functionality and morphology of EGGNP-flakes. To study the convective heat transfer coefficient in turbulent regime, a numerical study is performed at different weight fractions of EGGNP. According to the results, a higher weight concentration of EGGNP in basefluid indicates a greater extent of convective heat transfer coefficient and thermal conductivity, implying higher heat transfer rate over a backward-facing step.
Keywords
Backward-facing step, Heat transfer, Turbulent, Ethylene glycol, Functionalization, Graphene nanoplatelets
Divisions
fac_eng
Funders
Faculty of Engineering, University of Malaya, Malaysia: High Impact Research Grant UM.C/625/1/HIR/MOHE/ENG/45 and UMRG Grant RP012B-13AET
Publication Title
International Journal of Heat and Mass Transfer
Volume
97
Publisher
Elsevier