Backward-facing step heat transfer of the turbulent regime for functionalized graphene nanoplatelets based water–ethylene glycol nanofluids. (June 2016)

• Record Type: Journal Article
• Authors: Amiri, Ahmad; Arzani, Hamed Khajeh; Kazi, S.N.; Chew, B.T.; Badarudin, A.
• Is Part Of: International journal of heat and mass transfer. Volume 97(2016:Jun.)
• Page Start: 538
• Page End: 546
• Publication Date: 2016-06
• Subjects: Backward-facing step -- Heat transfer -- Turbulent -- Ethylene glycol -- Functionalization -- Graphene nanoplatelets; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2016.02.042
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: Introducing a promising method for functionalization of GNP. Preparing of GNP-based water–ethylene glycol nanofluids. Investigation of the thermophysical properties of the synthesized samples. Prediction of the convective heat transfer and performance index. Numerical investigation of heat transfer in an backward-facing step. 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.