Experimental investigation of cooling performance with graphene based nano-fluids in a vehicle radiator

Kılınç, Ferhat; Buyruk, Ertan; Karabulut, Koray

doi:10.1007/s00231-019-02722-x

Cited by 31 publications

(9 citation statements)

References 26 publications

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“…According to the x-ray diffraction patterns Co 2+ , Ni 2+ and Fe 3+ ions were occupied Zn 2+ tetrahedral sites substantially. SEM images exhibited that agglomerative formations were observed by TM doping due to fast growth in calcination although sedimentation was not observed in graphene based nano-fluids [32]. M-H measurements revealed that ZnO was transformed from paramagnetic to ferromagnetic state by Fe, Ni and Co doping.…”

Section: Resultsmentioning

confidence: 98%

Geçiş Metali Katkılı ZnO’in Ferromanyetizma ve Büyüme Korelasyonunun İncelenmesi

Sarf

Asikuzun

Yakar

2021

International Journal of Advances in Engineering and Pure Sciences

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In this study, a series of 3d transition metal (TM) (Co, Ni and Fe) doped ZnO particles synthesized by simple co-precipitation method. Structural, morphological and magnetic properties were investigated to determine correlation between growth process and ferromagnetism of metal doped ZnO samples. All samples had ZnO hexzagonal würtzite structure and slightly shift of ZnO indexed peaks was observed by TM incorporation in ZnO. Although ZnO samples had granular forms, agglomerative forms had emerged in TM:ZnO samples due to the fast growth process. The pure ZnO sample transformed paramagnetic to ferromagnetic by TM incorporation due to carrier mediated exchange interaction between TM ions. The results demonstated that doping with Fe 3+ ions in ZnO structure had enhanced ferromagnetism although fast growth and high particle agglomeration.

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Section: Resultsmentioning

confidence: 98%

Geçiş Metali Katkılı ZnO’in Ferromanyetizma ve Büyüme Korelasyonunun İncelenmesi

Sarf

Asikuzun

Yakar

2021

International Journal of Advances in Engineering and Pure Sciences

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“…GNR and water nanofluids obtained 15.62% and 20.64% enhancement values for 0.01% and 0.02% vol. concentrations respectively [43]. The studied results of Hamze, Berrada [44] stated that the concentration of FLG (Few layer Graphene) nanosheets varies between 0.05 and 0.5% in mass.…”

Section: The Volume Concentration Of the Fluidmentioning

confidence: 96%

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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“…Pendyala et al 12 performed CFD analysis on a car radiator with nanofluids as coolants and reported that the radiator performance was increased using nanofluids and the heat transfer, heat transfer coefficient was increased with increasing nanofluid concentration. Kılınç et al 13 experimentally investigated the effectiveness of graphene‐based nanofluids in a vehicle radiator and reported the heat transfer enhancement of the nanofluid by calculating the overall heat transfer coefficient and by comparing it with pure water. Elsaid et al 14 investigated and reported the thermophysical properties of different graphene‐based nanofluids like thermal conductivity, heat capacity, density, and viscosity, and also reported that graphene‐based nanofluids have better thermophysical properties compared to other metal oxides and metal nanofluids and the properties are achieved with very low concentrations.…”

Section: Introductionmentioning

confidence: 99%

CFD analysis of a flat tube with semi‐circular fins using graphene nanofluid and to compare performance with square type of fins

2022

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CFD analysis on a flat tube with semi‐circular fins under laminar flow conditions was performed with graphene‐based nanofluids considering the nanofluids as incompressible. Different simulations were performed at four different concentrations of nanofluids (0.01%, 0.1%, 0.2%, and 0.4%) and at different volume flow rates (4, 6, 8, and 10 LPM) and at four different forced convective heat transfer coefficients at different wind velocities at 300 K (50, 100, 150, and 200 W/m2 K). It was observed that with an increase in the concentration of nanoparticles in nanofluids, the thermal conductivity of base fluid water was increased (at 353 K the nanofluid of 0.4% volume concentration, the thermal conductivity of nanofluid increased by 200% with respect to base fluid). Graphene‐based nanofluids have higher effectiveness than most nanofluids hence it is considered for the analysis, at 0.4% concentration of nanofluid the effectiveness observed was 36.84% at 4 LPM, and for water, the effectiveness was 28.22% under similar conditions. The effect of flow rate on temperature drop was significant. At 4 LPM and at 0.4% of nanofluid, an outlet coolant temperature of 333 K was observed whereas the water outlet temperature at 10 LPM is 346.13 K. The effect of forced convective air heat transfer coefficient was significantly high. At h = 50 W/m2 K the outlet temperature of 0.4% nanofluid at 4 LPM was 345.25 K and at h = 200 W/m2 K, the outlet coolant temperature was 333.47 K. A single tube of the radiator was considered for the analysis whereas the original radiator consists of 50 tubes due to problems of Ansys in meshing.

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Experimental investigation of cooling performance with graphene based nano-fluids in a vehicle radiator

Cited by 31 publications

References 26 publications

Geçiş Metali Katkılı ZnO’in Ferromanyetizma ve Büyüme Korelasyonunun İncelenmesi

Geçiş Metali Katkılı ZnO’in Ferromanyetizma ve Büyüme Korelasyonunun İncelenmesi

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

CFD analysis of a flat tube with semi‐circular fins using graphene nanofluid and to compare performance with square type of fins

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