Multiscale modelling of ceramic nanoparticle interactions and their influence on the thermal conductivity of nanofluids

Mahmoud, Bashar; Mortimer, L. F.; Fairweather, Michael; Peakall, Jeff; Harbottle, David; Rice, Hugh P.

doi:10.1088/1361-6463/ab45ce

Cited by 6 publications

(6 citation statements)

References 53 publications

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“…However, with the increase in concentration mean free path decrease. This suggested that with an increase in the concentration the reduction in mean free path could reduce the thermal transport as compared to the low concentration 53 . Similarly in another study, a critical concentration (0.0011 vol%) of MWCNTs has been reported where maximum thermal conductivity enhancement was observed.…”

Section: Resultsmentioning

confidence: 63%

“…This suggested that with an increase in the concentration the reduction in mean free path could reduce the thermal transport as compared to the low concentration. 53 Similarly in another study, a critical concentration (0.0011 vol %) of MWCNTs has been reported where maximum thermal conductivity enhancement was observed. Beyond 0.0011%, a reduction in thermal conductivity was also noted up to certain limit of concentration.…”

Section: Thermal Conductivity Of Nfsmentioning

confidence: 62%

“…This causes an increased mean free path of high‐frequency vibrations which transfer more heat in the liquid 60 . Another plausible reason may be the reduction in mean free path of aggregates with concentration and increase with temperature as reported in the literature 53 …”

Section: Resultsmentioning

confidence: 77%

“…At this point, it was realized that the Brownian motion had played a dynamic role in improvement for certain concentrations 52 . However the role of clustering phenomenon may be least contributing factor as there was no apparent increase in the agglomerate size with temperature 53 . Moreover the basic energy carriers in PANI are electron and phonon.…”

Section: Resultsmentioning

confidence: 99%

“…52 However the role of clustering phenomenon may be least contributing factor as there was no apparent increase in the agglomerate size with temperature. 53 Moreover the basic energy carriers in PANI are electron and phonon. Whereas it has been reported that the phonon only thermal conductivity plays a major role in the PANI as compared to the electron.…”

Section: Thermal Conductivity Of Nfsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 63%

Section: Thermal Conductivity Of Nfsmentioning

confidence: 62%