Rheology and thermal conductivity of graphene oxide and coal fly ash hybrid nanofluids for various particle mixture ratios for heat transfer applications: Experimental study

Kanti, Praveen; Maiya, Manoor Prakash

doi:10.1016/j.icheatmasstransfer.2022.106408

Cited by 31 publications

(9 citation statements)

References 51 publications

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“…X-ray diffraction patterns of the pure CeO 2 with indexing of all the diffraction peaks confirms the phase purity of CeO 2 . 26,27 The diffraction pattern of doped CeO 2 also plotted in Figure 6 and a clear shift in peak position found. According to bragg's law, shift of peak position toward higher theta value concludes decrease in a lattice parameter (lattice contraction).…”

Section: Resultsmentioning

confidence: 88%

“…The proportionality constant is the thermal conductivity (k) of the material. 5,13,26 By measuring the power input and the temperature difference, the thermal conductivity of the material can be determined. Schematic of experimental setup of Guarded Hot Plate instrument to measures the thermal conductivity are shown in Figure 2.…”

Section: Experimental and Theoretical Detailsmentioning

confidence: 99%

“…Experimental techniques, such as X-ray diffraction, scanning electron microscopy, and transmission electron microscopy, can be used to investigate the structural and morphological changes in doped CeO 2 . Kanti et al 19,26,27 conducted an experimental study to estimate the heat transfer coefficient and friction factor of fly ash (14.5 nm)/water nanofluid with varying concentrations (0.5-2.0 vol%) flowing in a horizontal copper tube subjected to uniform heat flux for a range of Reynolds numbers (7000-45,000). They observed the highest augmentation in Nusselt number and pressure drop to be 67.4% and 11.9%, respectively, for an inlet fluid temperature of 60°C and a nanofluid concentration of 2%.…”

Section: Introductionmentioning

confidence: 99%

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Doped CeO₂/water nanofluids analyzed the performance of thermal conductivity and heat transfer: An experimental and theoretical investigations

Pandey,

Tiwari,

Paliwal

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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A combined experimental and theoretical study on thermal conductivity, heat transfer specific heat, and electronic properties has been done for doped CeO2/water nanofluid. First, the sol-gel method was implemented for the synthesis of doped CeO2 nanoparticles and then a mixture of nanoparticles with different concentrations of nanofluid. X-ray diffraction and SEM analysis confirm the structural phase purity and homogeneous mixing of nanofluids. Experimental thermal conductivity and specific heat of pure and 4f-doped CeO2 were estimated and found very close to our theoretical calculations. Experimental investigations have been carried out for the measurement of heat transfer using pure and doped CeO2/water nanofluid as the coolant. The experiments were aimed at determining the heat transfer and other thermal properties with different concentrations and with various fluid with Reynolds number 2500 and 3500. The heat transfer coefficient of nanofluids increases not only with an increase in the volume flow rate of the hot water but also increases with increase in the atomic number of dopant elements in CeO2. Electronic states show variation in band gap with doping which may also play an important role in the improvement of solar collectors. It is clear from experimental and theoretical findings that the thermal and electronic properties depend on number of valance electrons. Hence doping of 4f-element in CeO2 plays a vital role to increase the thermal conductivity and tuning of electronic properties leads to many applications in thermal sensors and solar cell-based industries.

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Section: Resultsmentioning

confidence: 88%

Section: Experimental and Theoretical Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Doped CeO₂/water nanofluids analyzed the performance of thermal conductivity and heat transfer: An experimental and theoretical investigations

Pandey,

Tiwari,

Paliwal

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The thermal conductivity and convective heat transfer coe cients of the formulated rGO-Fe 3 O 4 nanocomposite-based nano uids represented signi cant enhancements of 83.44% and 845.4 W/m 2 .K, respectively, when evaluated at 0.2 vol% concentration and a temperature of 40°C. Kanti et al [21] successfully synthesized nanoparticles consisting of GO and coal y ash (CFA) to develop mono and hybrid nano uids (HNF) with a water base. Different particle mixture ratios of 50:50 and 30:70, and surfactant polyvinylpyrrolidone (PVP) were employed.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the impact of graphene oxide nanoparticles on enhancing heat transfer characteristics within the indirect heat exchanger of a natural city gate station

Khouri,

Goshayeshi,

Nami

et al. 2023

Preprint

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In this study, the heat transfer characteristics within the heat exchanger using water-based GO nanofluids were comprehensively assessed. An apparatus was constructed by scaling down an industrial heat exchanger. The nanofluid’s thermal conductivity, specific heat capacity, viscosity, density, Prandtl number, and Nusselt number were examined at varying temperatures and GO nanoparticle concentrations. The results revealed that the thermal conductivity of the nanofluid increased with both temperature and nanoparticle concentration, reaching its peak value of 0.380 W.m− 1. K− 1 at 85°C and 0.1%wt, leading to enhanced heat transfer rates through conduction and convection mechanisms. The specific heat capacity increased with temperature but decreased with higher GO nanoparticle contents, with a maximum value of 3403.821 J.kg− 1. K− 1 was recorded at 40°C and 0.01%wt. The viscosity of the nanofluid increased with higher concentrations of GO nanoparticles, and the minimum value of 0.83 mpa.s was observed at 85°C and 0.01%wt. The Prandtl number decreased with temperature but increased with increasing GO nanoparticles concentration, suggesting a transition from convective to conductive heat transfer. A newly derived correlation equation for the Nusselt number, Nu = 0.0059(1 + 7.62φ0.6886)Pe0.001Re0.9238Pr0.4, allows predicting heat transfer enhancement in nanofluids. The findings emphasize the potential of nanofluids for improving heat exchanger performance and offer valuable insights for optimizing nanofluid applications in thermal systems.

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“…The thermal conductivity and convective heat transfer coefficients of the formulated rGO-Fe3O4 nanocomposite-based nanofluids represented significant enhancements of 83.44% and 845.4 W/m 2 .K, respectively, when evaluated at 0.2 vol% concentration and a temperature of 40°C. Kanti et al [46] successfully synthesized nanoparticles consisting of GO and coal fly ash (CFA) to develop mono and hybrid nanofluids (HNF) with a water base. Different particle mixture ratios of 50:50 and 30:70, and surfactant polyvinylpyrrolidone (PVP) were employed.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Heat Transfer in Industrial Heat Exchangers with Water-Based GO Nanofluids: Comprehensive Analysis and Performance Optimization

Mousavi

2023

Preprint

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In this study, the heat transfer characteristics within the heat exchanger using water-based GO nanofluids were comprehensively assessed. An apparatus was constructed by scaling down an industrial heat exchanger. The nanofluid’s thermal conductivity, specific heat capacity, viscosity, density, Prandtl number, and Nusselt number were examined at varying temperatures and GO nanoparticle concentrations. The results revealed that the thermal conductivity of the nanofluid increased with both temperature and nanoparticle concentration, reaching its peak value of 0.380 W.m− 1. K− 1 at 85°C and 0.1%wt, leading to enhanced heat transfer rates through conduction and convection mechanisms. The specific heat capacity increased with temperature but decreased with higher GO nanoparticle contents, with a maximum value of 3403.821 J.kg− 1. K− 1 was recorded at 40°C and 0.01%wt. The viscosity of the nanofluid increased with higher concentrations of GO nanoparticles, and the minimum value of 0.83 mpa.s was observed at 85°C and 0.01%wt. The Prandtl number decreased with temperature but increased with increasing GO nanoparticle concentration, suggesting a transition from convective to conductive heat transfer. A newly derived correlation equation for the Nusselt number, Nu = 0.0059(1 + 7.62φ0.6886)Pe0.001Re0.9238Pr0.4, allows predicting heat transfer enhancement in nanofluids. The findings emphasize the potential of nanofluids for improving heat exchanger performance and offer valuable insights for optimizing nanofluid applications in thermal systems.

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Rheology and thermal conductivity of graphene oxide and coal fly ash hybrid nanofluids for various particle mixture ratios for heat transfer applications: Experimental study

Cited by 31 publications

References 51 publications

Doped CeO₂/water nanofluids analyzed the performance of thermal conductivity and heat transfer: An experimental and theoretical investigations

Doped CeO₂/water nanofluids analyzed the performance of thermal conductivity and heat transfer: An experimental and theoretical investigations

Evaluating the impact of graphene oxide nanoparticles on enhancing heat transfer characteristics within the indirect heat exchanger of a natural city gate station

Enhancing Heat Transfer in Industrial Heat Exchangers with Water-Based GO Nanofluids: Comprehensive Analysis and Performance Optimization

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Rheology and thermal conductivity of graphene oxide and coal fly ash hybrid nanofluids for various particle mixture ratios for heat transfer applications: Experimental study

Cited by 31 publications

References 51 publications

Doped CeO2/water nanofluids analyzed the performance of thermal conductivity and heat transfer: An experimental and theoretical investigations

Doped CeO2/water nanofluids analyzed the performance of thermal conductivity and heat transfer: An experimental and theoretical investigations

Evaluating the impact of graphene oxide nanoparticles on enhancing heat transfer characteristics within the indirect heat exchanger of a natural city gate station

Enhancing Heat Transfer in Industrial Heat Exchangers with Water-Based GO Nanofluids: Comprehensive Analysis and Performance Optimization

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Resources

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Doped CeO₂/water nanofluids analyzed the performance of thermal conductivity and heat transfer: An experimental and theoretical investigations

Doped CeO₂/water nanofluids analyzed the performance of thermal conductivity and heat transfer: An experimental and theoretical investigations