Study of the Effect of Volume Fraction Concentration and Particle Materials on Thermal Conductivity and Thermal Diffusivity of Nanofluids

Ali, Faris Mohammed; Yunus, Wan Mahmood Mat

doi:10.1143/jjap.50.085201

Cited by 9 publications

(3 citation statements)

References 23 publications

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“…Similar results have been reported in the literature for metal nanofluids measured by hot wire method [14,15]. This dependency can be attributed to the volumetric increase of the nanoparticles that effectively decreases the specific heat of the nanofluids; consequently, the thermal diffusivity of the colloidal suspension increases.…”

Section: Resultssupporting

confidence: 88%

Thermal diffusivity measurement for urchin-like gold nanofluids with different solvents, sizes and concentrations/shapes

et al. 2012

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The thermal properties of nanofluids are an especially interesting research topic because of the variety of potential applications, which range from bio-utilities to next-generation heat-transfer fluids. In this study, photopyroelectric calorimetry for measuring the thermal diffusivity of urchin-like colloidal gold nanofluids as a function of particle size, concentration and shape in water, ethanol and ethylene glycol is reported. Urchin-like gold nanoparticles were synthesised in the presence of hydroquinone through seed-mediated growth with homogeneous shape and size ranging from 55 to 115 nm. The optical response, size and morphology of these nanoparticles were characterised using UV-visible spectroscopy and transmission electron microscopy. The thermal diffusivity of these nanofluids decreased as the size of the nanoparticles increased, and the enhancement depended on the thermal diffusivity of the solvent. The opposite effect (increase in thermal diffusivity) was observed when the nanoparticle concentration was increased. These effects were more evident for urchin-like gold nanofluids than for the corresponding spherical gold nanofluids.

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Section: Resultssupporting

confidence: 88%

Thermal diffusivity measurement for urchin-like gold nanofluids with different solvents, sizes and concentrations/shapes

et al. 2012

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“…[23,86]. Based on the study carried out by Ali et al [87], who showed that a nanofluid's thermal conductivity coefficient increases with the size of the NPs, and considering the similarity between heat and mass transfer, it may be argued that the better performance of the Al 2 O 3 (II) NF was due to the increase in the NPs.…”

Section: Resultsmentioning

confidence: 99%

Experimental Investigation of Mass Transfer Intensification for CO2 Capture by Environment-Friendly Water Based Nanofluid Solvents in a Rotating Packed Bed

2022

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In this research, two intensification approaches for CO2 capture via a rotating packed bed (RPB) and nanofluids were examined simultaneously to maximize the experimental mass transfer coefficient. The two intensification approaches were done by using water as a green, environmentally friendly absorption solvent and as the base fluid for preparing nanofluids and also by using centrifugal acceleration in an RPB. Physicosorption of CO2 in an RPB was carried out by applying Al2O3, TiO2, and SiO2 nanofluids to intensify the mass transfer in water, and the operation parameters such as the angular speed of the rotor, concentration and type of nanoparticles, gas and liquid flow rates, and CO2 concentration in mass transfer intensification were evaluated and several nanofluids were selected to survey investigate how they affect the mass transfer at low pressure. The results show that the Al2O3 nanofluid was more effective than other nanofluids and that the 40 nm nanofluid of this type was more efficient than the 20 nm size. Therefore, a correlation is proposed in this paper for liquid volumetric mass transfer coefficient prediction that includes the microconvection of nanoparticles and surface tension.

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“…The comparative analysis between circular and flat tubes in this study adds a layer of complexity, underscoring the need for custom solutions tailored to the specific geometry of heat exchangers. Ali and Yunus [4] contributed valuable insights into how particle size affects the thermal properties of Al 2 O 3 nanofluids. The study's consideration of factors such as the interfacial layer between solids and liquids, the ballistic energy involved, and the mechanisms of heat transfer within nanoparticles lays the groundwork for a comprehensive understanding of nanofluid behavior.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Thermal Performance of Shell and Tube Heat Exchangers Using TiO2/Water Nanofluids: An SST Turbulence Model Analysis

Musinguzi,

2023

JSE

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Over recent years, nanotechnology's landscape has witnessed transformative advancements, heralding new research opportunities in scientific and engineering domains. A notable innovation in this evolution is the development of nanofluids, comprising nanoparticles (each under 100 nm in diameter) suspended in conventional heat transfer fluids such as ethylene glycol and water. Distinguished from traditional heat transfer fluids, nanofluids are posited to offer substantial enhancements, particularly in thermal characteristics. The dispersion of nanoparticles, even in minimal quantities, within base fluids markedly improves the thermal properties of these fluids. This study focuses on evaluating the thermal performance of a shell and tube heat exchanger utilizing the shear stress transport (SST) turbulence model. ANSYS CFX, acclaimed for its accuracy, robustness, and expedience in various turbulence models, is employed for this analysis. The SST model is particularly effective in non-equilibrium turbulent boundary layer flows, enabling accurate heat transfer predictions. ANSYS CFX's approach to near-wall equations mitigates the stringent grid resolution requirements often encountered in computational fluid dynamics (CFD) applications. The investigation encompasses the use of water and TiO 2 /water nanofluid at varying concentrations (1%, 2%, 3%, 4%, 5%) in a 3D model and CFD simulation. Enhanced efficiency and cooling performance are observed with the introduction of nanofluids in the shell and tube heat exchanger.

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Study of the Effect of Volume Fraction Concentration and Particle Materials on Thermal Conductivity and Thermal Diffusivity of Nanofluids

Cited by 9 publications

References 23 publications

Thermal diffusivity measurement for urchin-like gold nanofluids with different solvents, sizes and concentrations/shapes

Thermal diffusivity measurement for urchin-like gold nanofluids with different solvents, sizes and concentrations/shapes

Experimental Investigation of Mass Transfer Intensification for CO2 Capture by Environment-Friendly Water Based Nanofluid Solvents in a Rotating Packed Bed

Enhanced Thermal Performance of Shell and Tube Heat Exchangers Using TiO2/Water Nanofluids: An SST Turbulence Model Analysis

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