Experimental investigation on stability, thermal conductivity and rheological properties of rGO/ethylene glycol based nanofluids

Shah, Syed Nadeem Abbas; Shahabuddin, Syed; Sabri, Mohd Faizul Mohd; Salleh, Mohd Faiz Mohd; Ali, Mohamad Azlin Bin; Hayat, Nasir; Sidik, Nor Azwadi Che; Samykano, M.; Saidur, R.

doi:10.1016/j.ijheatmasstransfer.2019.118981

Cited by 69 publications

(29 citation statements)

References 64 publications

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“…This maybe one of the reason for enhancement of thermal conductivity and other rheological properties. Network structures are formed in the nanofluids at higher particle concentrations at lower stresses or frequencies as reported by some studies [39]. It is noted from the plots that the critical external strain is independent of all concentrations of the fluids.…”

Section: Amplitude Sweepsupporting

confidence: 72%

Experimental Investigation on Rheological Properties of Water Based Novel Ternary Hybrid Nanofluids

Zayan¹,

Rasheed²,

John³

et al. 2021

Preprint

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This study presents the rheological characterization of deionised water dispersed with two different ternary-hybrid nanoparticles namely, GO-TiO2-Ag and rGO-TiO2-Ag. The stability of 0.05 wt% nanofluid samples are serially diluted by 10 fold in 5 levels is determined using zeta potential measurements. The non-linear viscoelastic measurements at temperatures ranging from 25oC to 50oC reveal that the graphene based ternary hybrid nanoparticle nanofluids exhibit Newtonian behaviour at higher concentrations. However, it displays shear thinning or pseudo-plastic fluid characteristics at lower concentration, suggesting a potential influence of nanoparticle aggregation on the viscosity. The experimental results are found to be in good agreement with the existing water based viscosity models. In addition, the effect due to shear stress, angular sweep, frequency sweep and damping factor ratio is also plotted.

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Section: Amplitude Sweepsupporting

confidence: 72%

Experimental Investigation on Rheological Properties of Water Based Novel Ternary Hybrid Nanofluids

Zayan¹,

Rasheed²,

John³

et al. 2021

Preprint

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“…On the other hand the NFs also depict the decreasing trend of predicted thermal conductivity beyond certain temperature as shown in Figure S4B‐D. In addition the irregular variation of thermal conductivity with temperature and concentration has also already been reported 58 …”

Section: Resultssupporting

confidence: 54%

“…The possible reason is the orientation of the NPs dispersion and high zero shear viscosity of base fluid due to strong hydrogen bonding. As the particles are added into base fluid network, they may oppose the spindle motion of measuring system due to continuous state of Brownian motion 58 . Nevertheless at the solid/liquid interface of the dispersion flow systems, the particles may align in flow direction due to hydrodynamic slip effects when shear rate increase 63 .…”

Section: Resultsmentioning

confidence: 99%

Thermal conductivity, rheology and stability analysis of 2D tungsten disulphide‐doped polyaniline‐based nanofluids: An experimental investigation

et al. 2020

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Summary In this study, polyaniline (PANI) nanocomposite‐based nanofluids (NFs) in ethylene glycol were obtained with a two‐step method by varying volume concentrations from 0.005% to 0.02%. Tungsten disulphide (WS2) nanoparticles were doped in PANI having different weight percentage (1%, 2% and 5%) via oxidative in situ polymerization employing ammonium persulphate oxidant in an acidic environment. The nanocomposites were comprehensively characterised using various techniques, such as Fourier transform infrared spectroscopy, thermogravimetric analysis, field emission scanning electron microscopy and high‐resolution transmission electron microscopy. The formulated NFs were extensively investigated with zeta‐sizer, particle size analyzer, thermal property analyzer and rheometer in a temperature range of 25°C to 70°C. The zeta potential results (up to 54.5 mV) were evident of extraordinary stability of NFs at all targeted temperatures along with polydispersity index <30% and mean particle/agglomerate size in the range of 335.8 to 489 nm. Additionally, a remarkable thermal conductivity improvement (~20.7%) was achieved with intrinsic PANI‐based NFs at an operating temperature of 50°C. Subsequently, it varied substantially with WS2 doping within PANI matrix and reached to 117.9%. Furthermore, the rheological measurements have revealed the viscoelastic nature of NFs along with a remarkable reduction in apparent viscosity (up to 8.4%). The temperature sweep viscosity indicated the transition of relative viscosity from high to low at a critical temperature of about 55°C. The NF10 (WS2 + PANI 5, at 0.005 vol%) was found to be the best candidate with 63.8% thermal conductivity enhancement and 6.4% viscosity reduction as compared with the base fluid at an operating temperature of 50°C. Thus, WS2 doping within PANI has proved to be crucial in the proliferation of thermal conductivity and mitigation of viscosity.

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“…13.4%, 14.4% and 15.8% are the maximum viscosity values at 25°C, 50°C and 70°C correspondingly. After 4 days testing, Viscosity of nanofluid recorded less values as compared with base fluid [42].…”

Section: Thermal Conductivitymentioning

confidence: 90%

“…While using 1 vol% of SDS (Sodium dodecyl sulfate) surfactant, the value of zeta potential increased 30.7 mV to 52.2 mV. Enhancement from 2.6% to 3.9% is exhibited for thermal conductivity, reduction in viscosity progressed from 8.8% to 12.2% [42]. The Graphene Oxide (GO) and Graphene Nano Ribbons (GNR) nano-fluids were obtained by using pure water as base fluid.…”

Section: The Volume Concentration Of the Fluidmentioning

confidence: 99%

Heat transfer performance of a radiator with and without louvered strip by using Graphene-based nanofluids

Sandhya

Ramasamy

Sudhakar

et al. 2021

Journal of Thermal Engineering

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The present work is focused on the Graphene-based nanofluids with high thermal conductivity which helps to improve the performance and enhance heat transfer. The thermal systems emphasis on the fluid coolant selection and statistical model. Graphene is a super-material, lighter than air, high thermal conductivity, and chemical stability. The purpose of the research is to work up with Graphene-based Nanofluids i.e., Graphene (G) and Graphene oxide (GO). Nanoparticles are dispersed in a base fluid with a 60:40 ratio Water & Ethylene Glycol and at different volume concentrations ranging from 0.01%-0.09%. Radiator model is designed in modelling software and louvered strip is inserted. The simulation (Finite Element Analysis) is performed to evaluate variation in temperature drop, enthalpy, entropy, heat transfer coefficient and total heat transfer rate of the considered nanofluids, results were compared by with and without louvered strip in the radiator for the temperature absorption. 58-60% enhancement of enthalpy observed when Graphene and Graphene oxide nanofluid was utilized. 1.8% enhancement of entropy is observed in 0.09% volume concentration of the Graphene and Graphene oxide nanofluid when louvered strips are inserted in the radiator tube at a flow rate of 3 LPM. With louvered strip inserted in the radiator, heat transfer coefficient enhanced by 236% for Graphene and 320% enhancement is identified for Graphene oxide nanofluid when compared to without louvered strip insert. The results stated that high performance is observed with the utilization of louvered strip in the radiator tube.

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Experimental investigation on stability, thermal conductivity and rheological properties of rGO/ethylene glycol based nanofluids

Cited by 69 publications

References 64 publications

Experimental Investigation on Rheological Properties of Water Based Novel Ternary Hybrid Nanofluids

Experimental Investigation on Rheological Properties of Water Based Novel Ternary Hybrid Nanofluids

Thermal conductivity, rheology and stability analysis of 2D tungsten disulphide‐doped polyaniline‐based nanofluids: An experimental investigation

Heat transfer performance of a radiator with and without louvered strip by using Graphene-based nanofluids

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