TY - JOUR
T1 - Experimental study on heat transfer augmentation of graphene based ferrofluids in presence of magnetic field
AU - Sadeghinezhad, Emad
AU - Mehrali, Mohammad
AU - Akhiani, Amir Reza
AU - Tahan Latibari, Sara
AU - Dolatshahi-Pirouz, Alireza
AU - Metselaar, Hendrik Simon Cornelis
AU - Mehrali, Mehdi
PY - 2017/3/5
Y1 - 2017/3/5
N2 - The effect of a permanent magnetic field on the heat transfer characteristics of hybrid graphene-magnetite nanofluids (hybrid nanofluid) under forced laminar flow was experimentally investigated. For this purpose, a reduced graphene oxide-Fe3O4 was synthesized by using two-dimensional (2D) graphene oxide, iron salts and tannic acid as the reductant and stabilizer. Graphene sheets acted as the supporting materials to enhance the stability and thermal properties of magnetite nanoparticles. The thermo-physical and magnetic properties of this hybrid nanofluid have been widely characterized and it shows that the thermal conductivity increased up to 11%. The hybrid nanofluid behaves as a Newtonian fluid with liquid like behavior with superparamagnetic properties as was evident from its magnetic saturation value at 45.9 emu/g. Moreover, the experimental heat-transfer results indicated that the heat transfer enhancement of the hybrid nanofluid compared to the control fluid (distilled water) was negligible when no magnetic field was applied. Additionally, the convective heat transfer was significantly improved under the influence of a magnetic field with a maximum enhancement of 82% in terms of the convective heat transfer properties of the hybrid nanofluid.
AB - The effect of a permanent magnetic field on the heat transfer characteristics of hybrid graphene-magnetite nanofluids (hybrid nanofluid) under forced laminar flow was experimentally investigated. For this purpose, a reduced graphene oxide-Fe3O4 was synthesized by using two-dimensional (2D) graphene oxide, iron salts and tannic acid as the reductant and stabilizer. Graphene sheets acted as the supporting materials to enhance the stability and thermal properties of magnetite nanoparticles. The thermo-physical and magnetic properties of this hybrid nanofluid have been widely characterized and it shows that the thermal conductivity increased up to 11%. The hybrid nanofluid behaves as a Newtonian fluid with liquid like behavior with superparamagnetic properties as was evident from its magnetic saturation value at 45.9 emu/g. Moreover, the experimental heat-transfer results indicated that the heat transfer enhancement of the hybrid nanofluid compared to the control fluid (distilled water) was negligible when no magnetic field was applied. Additionally, the convective heat transfer was significantly improved under the influence of a magnetic field with a maximum enhancement of 82% in terms of the convective heat transfer properties of the hybrid nanofluid.
KW - Convective heat transfer
KW - Graphene
KW - Magnetic field
KW - Magnetic nanofluid
U2 - 10.1016/j.applthermaleng.2016.11.199
DO - 10.1016/j.applthermaleng.2016.11.199
M3 - Article
AN - SCOPUS:85002870586
SN - 1359-4311
VL - 114
SP - 415
EP - 427
JO - Applied thermal engineering
JF - Applied thermal engineering
ER -