Particle size and concentration effect on thermal diffusivity of water-based ZnO nanofluid using the dual-beam thermal lens technique

Ramya, M.; Nideep, T. K.; Nampoori, V. P. N.; Kailasnath, M.

doi:10.1007/s00340-019-7294-9

Cited by 26 publications

(11 citation statements)

References 58 publications

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“…For NPs with high optical absorption (quantum dots, metal NPs, etc. ), a significant change in thermal diffusivity is observed at a concentration of 0.01-0.1 mg/mL [14,17]. In our case, even though silicon oxide nanoparticles weakly absorb radiation, it is clearly shown that a significant change in D occurs at concentrations above 5 mg/mL.…”

Section: Ludoxsupporting

confidence: 44%

Thermal Diffusivity of Aqueous Dispersions of Silicon Oxide Nanoparticles by Dual-Beam Thermal-Lens Spectrometry

Khabibullin¹,

Usoltseva²,

Mikheev³

et al. 2023

Preprint

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The growing interest in heat-conducting nanofluids requires highly sensitive methods for analyzing thermal properties. Thermal-lens spectrometry, despite its advantages over classical methods, does not have a general approach to measuring and interpreting results for dispersed systems. In this paper, by the example of nanofluids of silicon oxide in water in a wide range of concentrations and sizes, the selection of measurement parameters for transient and steady-state thermal lensing is justified, and the interpretation of the results of thermal diffusivity measurements is substantiated. The features of measurements of thermal diffusivity by thermal lens spectrometry under stationary state for dispersed systems are considered. Using this approach, it is possible to detect and distinguish thermal effects with high accuracy. For dispersions of silicon oxide, with increasing concentration, the thermal diffusivity passes through a minimum. Silicon oxide dispersions can be used both as a coolant or as a heat-removing liquid by selecting the particle size and concentration.

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Section: Ludoxsupporting

confidence: 44%

Thermal Diffusivity of Aqueous Dispersions of Silicon Oxide Nanoparticles by Dual-Beam Thermal-Lens Spectrometry

Khabibullin¹,

Usoltseva²,

Mikheev³

et al. 2023

Preprint

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“…53 From Figure 7a, it can also be seen that irrespective of the base fluid, the thermal diffusivity of the nanofluids increases with the concentration of the nanoparticle dispersed in it, which is in agreement with the literature reports. 26,27,54 In low viscous media, the particle dynamics become significant due to the low viscous drag force. This offers greater freedom of movement, resulting in a faster rate of heat transfer.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Thermal Lensing of Multi-walled Carbon Nanotube Solutions as Heat Transfer Nanofluids

Swapna

Raj

Cabrera

2021

ACS Appl. Nano Mater.

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This paper unwraps nanofluids' particle dynamics with multi-walled carbon nanotubes (MWCNTs) in base fluids such as acetone, water, and ethylene glycol. Having confirmed the morphology and structure of the MWCNTs by field emission scanning electron microscopy, X-ray diffraction, and Raman spectroscopic analyses, the nanofluids are prepared in three different concentrations. The nonzero absorbance at the laser wavelength, revealed through the UV−visible spectrum, makes the thermal diffusivity study of the sample by the sensitive nondestructive single beam thermal lens (TL) technique possible. The TL signal analysis by time series and fractal techniques divulges the complex particle dynamics, through phase portrait, sample entropy, fractal dimension, and Hurst exponent. The study unveils the effect of the amount of nanoparticles and the viscosity of the medium on thermal diffusivity and particle dynamics. The observed inverse relation between thermal diffusivity and viscosity is in good agreement with the Sankar−Swapna model. The complexity of particle dynamics in MWCNT nanofluids reflected through sample entropy, and fractal dimension shows an inverse relation to the base fluid's viscosity. This paper investigates the role of viscosity of the base fluid on particle dynamics and thermal diffusivity of the nanofluid to explore its applicability in various thermal systems, thereby suggesting a method to tune the sample entropy through proper selection of base fluid.

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“…It depends on the thermal conductivity, density, and speci c heat of the material. Thermal diffusivity of the material decreases with temperature rise (Stanger et al 2013;Deng et al 2017b) and increases with increase in the particle size (Ramya et al 2019). Material with high thermal diffusivity has the ability of rapid heat transfer.…”

Section: Effect Of Particle Size On Thermal Diffusivitymentioning

confidence: 99%

Effects of intrinsic properties, particle size, bulk density, and specific gravity on thermal properties of coal dusts

Sahu

Mishra

2023

Environ Sci Pollut Res

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Thermal properties of pulverized coal govern the heat transfer and greatly in uence the coal dust explosion and spontaneous combustion processes. This study measures the thermal properties of ve coal samples at six distinct particle sizes using an advanced Thermal Property Analyzer. The thermophysical properties of coal dust positively correlated with particle size. Thermal conductivity, diffusivity and speci c heat capacity increased with increase in the ash percentage, bulk density, and speci c gravity of coal dust, whereas they negatively correlated with xed carbon and volatiles content of coal.Empirical relations between the thermo-physical properties were developed. The thermal conductivity, diffusivity, and speci c heat capacity of coal dusts varied in the ranges of 0.091-0.147 W/mK, 0.125-0.164 mm²/s, and 0.715-0.945 MJ/m³K, respectively. With increase in particle size from < 38 to 500-1000 µm, thermal conductivity, thermal diffusivity and speci c heat capacity increased in the range of 25.60-32.89%, 9.76-22.11%, and 9.57-20.80%, respectively for different coal samples.

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Particle size and concentration effect on thermal diffusivity of water-based ZnO nanofluid using the dual-beam thermal lens technique

Cited by 26 publications

References 58 publications

Thermal Diffusivity of Aqueous Dispersions of Silicon Oxide Nanoparticles by Dual-Beam Thermal-Lens Spectrometry

Thermal Diffusivity of Aqueous Dispersions of Silicon Oxide Nanoparticles by Dual-Beam Thermal-Lens Spectrometry

Thermal Lensing of Multi-walled Carbon Nanotube Solutions as Heat Transfer Nanofluids

Effects of intrinsic properties, particle size, bulk density, and specific gravity on thermal properties of coal dusts

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