Experimental study on density and thermal conductivity properties of Indian coal fly ash water-based nanofluid

Kanti, Praveen; Sharma, K.V.; Ramachandra, C. G.; Sai, P. H. V. Sesha Talpa

doi:10.1080/01430750.2020.1751285

Cited by 22 publications

(17 citation statements)

References 19 publications

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“…It may be attributed to the greater surface area and larger number of particles at a concentration. [33][34][35][36] Figure 12 provides a comparison between the experimental results of the present study with others at different temperatures. The dynamic viscosity of 11.5-nm fly ash nanofluid sample is lower than the experimental data of Said et al 36 performed with various particle sizes in base liquid water.…”

Section: Thermal Conductivitymentioning

confidence: 73%

“…The improvement in energy leads to higher random motion and weakening of the fluid molecules carrying intermolecular forces. Such factors contribute to a decreased resistance of the fluid to the shearing flow and a decrease in viscosity is observed by inference 33‐36 …”

Section: Resultsmentioning

confidence: 98%

“…Results show that the viscosity increases with concentration and decreases with the particle size. It may be attributed to the greater surface area and larger number of particles at a concentration 33‐36 …”

Section: Resultsmentioning

confidence: 99%

“…Such factors contribute to a decreased resistance of the fluid to the shearing flow and a decrease in viscosity is observed by inference. [33][34][35][36] The variation in viscosity with volume concentration, particle size, and temperature is shown in Figure 11. Table 7 gives the viscosity for different particle sizes at various temperatures for a volume concentration of 0.1%.…”

Section: Thermal Conductivitymentioning

confidence: 99%

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Effect of ball milling on the thermal conductivity and viscosity of Indian coal fly ash nanofluid

Kanti¹,

Sharma

Ramachandra

et al. 2020

Heat Trans

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The present study investigates the effect of ball milling on thermal conductivity and viscosity of stable nanofluid of fly ash from Indian coal. The particle size of fly ash decreased from micron size to 89, 55.5, and 11.5 nm with reduction by 55, 90, and 434 times, respectively, due to ball milling for 30, 40, and 60 hours. The surfactant Triton X-100 was used to attain stability of 0.1% and 0.5% volume concentration of fly ash nanofluid. The samples were characterized by using scanning electron microscopy, dynamic light scattering, and zeta potential analysis. The outcome reveals that the thermal conductivity of fly ash nanofluid increases with temperature, volume concentration, and reduction in particle size. A maximum enhancement in thermal conductivity of 11.9% with 11.5-nm nanofluid sample and 5.4% with 89-nm nanofluid sample for 0.5% concentration at 60°C is observed. The viscosity of fly ash nanofluid increases with concentration and varies inversely with particle size and temperature. A difference of 1.6% in viscosity is observed between the values obtained with 11.5 and 89 nm nanofluid samples for 0.5% concentration at 30°C. K E Y W O R D S fly ash nanofluid, heat transfer, stability, thermophysical properties Nanofluids can be known as fluids in which solid particles smaller than 100 nm in dimension are dispersed and distributed randomly in a base fluid, such as water, oil, glycerin, and so forth. Nanofluids can be used as heat transfer fluids. 1-3 Nanofluids are shown to have notable thermophysical properties, that is, viscosity, thermal conductivity, density, specific heat, and so forth, which are crucial for applications involving single-phase convection heat transfer. The properties of nanoparticles and base fluid affect the thermophysical properties of nanofluids. Lee et al 4 used molecular dynamic simulation studies to examine the thermal conductivity and viscosity of copper nanoparticles dispersed in liquid argon. They studied the effect of particle size and temperature in the concentration range of 2.19% to 7.77% vol. Particle diameters of 1.5 and 2.0 nm were considered for testing the dependence of particle size at a temperature of 86K. For nanofluids with a particle diameter of 2.0 nm, the effect of temperature range from 86 to 101K has been further studied. They reported that thermal conductivity improves with particle size and is independent of temperature, but the viscosity varies inversely with particle size and temperature. Nguyen et al 5 examined the influence of particle size (36 and 47 nm) on Al 2 O 3-water nanofluid viscosity and reported no significant variation in the values for concentration lower than 4% vol. However, at higher concentration, the viscosity was higher for 47 nm. He et al 6 concluded that large agglomerated TiO 2 nanofluid had higher viscosity in contrast with a smaller cluster. Sozen et al 7 determined the thermal performance of a two-phase closed thermosyphon with fly ash nanofluid at various function states. They reported the efficiency of heat pipe increased by...

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Section: Thermal Conductivitymentioning

confidence: 73%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Thermal Conductivitymentioning

confidence: 99%

See 2 more Smart Citations

Effect of ball milling on the thermal conductivity and viscosity of Indian coal fly ash nanofluid

Kanti¹,

Sharma

Ramachandra

et al. 2020

Heat Trans

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“…The key cause for the increase in thermal conductivity could be due to a large number of interactions between the nanoparticles and the Brownian motion and its chemical composition. 40 Furthermore, the number of dispersed nanoparticles is greater at higher concentration. 31,32,37 The thermal conductivity of fly ash-Cu/water-based hybrid nanofluid at 60°C is compared with the values estimated with various correlation, as shown in Figure 12.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Thermophysical properties of fly ash–Cu hybrid nanofluid for heat transfer applications

Kanti¹,

Sharma

Revanasiddappa

et al. 2020

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The effect of temperature and concentration on the thermophysical properties of fly ash-copper (80% fly ash and 20% Cu by volume) water-based stable hybrid nanofluid is studied. The experiments are conducted for the volume concentration range of 0 to 0.5% in the temperature range of 30 to 60°C. The nanoparticles have been characterized by transmission electron microscopy and dynamic light scattering to determine an average nanoparticle diameter of 15 nm. The stability of nanofluid in the presence of surfactant Triton X-100 is examined with the help of zeta potential. The maximum enhancement in thermal conductivity and viscosity is 19% and 22%, respectively. The outcome of the present study showed that density, thermal conductivity, and viscosity of the hybrid nanofluid increased, whereas specific heat decreased with an increase in the nanofluid concentration. In addition, the specific heat and thermal conductivity increase, there is a decrease in density and viscosity of the hybrid nanofluid with an increase in temperature.

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A simulation approach in analyzing performance of fly ash nanofluid for optimizing battery thermal management system used in EVs

Thorat,

Sanap,

Gawade

et al. 2024

Energy Storage

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Electric vehicles (EVs) are a fundamental paradigm shift in the automotive industry, driven by the desire to achieve sustainable mobility, ameliorate climate change, and cut greenhouse gas emissions. Electric vehicle (EV) technology has advanced significantly in recent years, with improvements in battery efficiency, range, and charging infrastructure among them. Lithium‐ion battery technology has evolved tremendously, boosting energy density and cutting costs as the primary energy storage option for electric vehicles. The advancement of fast‐charging stations and smart grid integration, which have significantly resolved concerns with convenience and charging time, has also fostered a wider acceptance of EVs. Nonetheless, the operating temperature range of the lithium‐ion cells currently in use is 15°C‐35°C. The vehicle's range and battery performance can be impacted by temperatures above or below. For efficient cooling and to keep the cells within the operational temperature range, a suitable Battery Thermal Management System (BTMS) must be implemented. The utilization of fly ash nanoparticles dispersed in water‐ethylene glycol base fluid as coolant in indirect liquid cooling systems is the main topic of the current work. For 14 LFP cylindrical cells with a 2S7P configuration and a serpentine cooling channel between the cells, an ANSYS FLUENT model has been created. The goal of the current study is to comprehend the rise in temperature at the outlet for various flow velocities by using fly ash nanofluid with 5% particle concentration as cooling. When the fluid flow rate was 0.1 m/s, the cooling performance was better, resulting in an outlet temperature rise of 311.976 K and a 4% temperature rise above the 300 K inlet fluid flow temperature. Indicating efficient cooling at lower fluid flow velocities, the percentage difference between the rise in temperature of the fluid's outflow at 0.1 and 3 m/s is 3.07%. Compared to the current coolant, ethylene glycol, the average increase in temperature difference (∆T)% is between 0.9% and 1.2% using fly ash nanofluid. Thus, the use of Fly ash as a nanofluid in battery cooling applications will certainly help to reduce the temperature of the battery pack and can provide a sustainable solution leading to lesser degradation of the environment.

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Experimental study on density and thermal conductivity properties of Indian coal fly ash water-based nanofluid

Cited by 22 publications

References 19 publications

Effect of ball milling on the thermal conductivity and viscosity of Indian coal fly ash nanofluid

Effect of ball milling on the thermal conductivity and viscosity of Indian coal fly ash nanofluid

Thermophysical properties of fly ash–Cu hybrid nanofluid for heat transfer applications

A simulation approach in analyzing performance of fly ash nanofluid for optimizing battery thermal management system used in EVs

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