Study of thermal conductivity of synthesized Al2O3-water nanofluid by pulsed laser ablation in liquid

Riahi, Afifa; Khamlich, S.; Balghouthi, Moncef; Khamliche, T.; Doyle, T. B.; Dimassi, Wissem; Guizani, Amenallah; Mâaza, M.

doi:10.1016/j.molliq.2020.112694

Cited by 65 publications

(21 citation statements)

References 49 publications

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“…Laser Ablation Method, this method consists in the synthesis of nanoparticles during the interaction of a laser pulse with a solid target surface in a liquid environment. There are several promising advantages of laser ablation in liquids such as simplicity of the technique and rapidity compared to other methods [14]. Figure 2 shows the experimental equipment for the PLAL method.…”

Section: ) Physical Methodsmentioning

confidence: 99%

The Synthesis of CuO-Based Nanofluids as a Cooling Media

Esmawan¹,

Antarnusa²,

Lilmuttaqin³

et al. 2021

Advances in Social Science, Education and Humanities Research

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Nanofluids have received significant attention due to their increased thermal characteristics. This increase was due to the addition of nanoparticles in the basic fluid. This research uses literature study method. Based on the literature study that has been done, the thermal conductivity of water and CuO is high. However, the value of the thermal conductivity of water-CuO nanofluids also varies according to experiments conducted by Das et al., Sahooli et al., and Micali et al. This can occur due to several factors such as the size of the nanoparticles, agglomeration, pH value, and others. With this high thermal conductivity value, water-CuO nanofluid can be used as a cooling medium.

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Section: ) Physical Methodsmentioning

confidence: 99%

The Synthesis of CuO-Based Nanofluids as a Cooling Media

Esmawan¹,

Antarnusa²,

Lilmuttaqin³

et al. 2021

Advances in Social Science, Education and Humanities Research

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show abstract

“…When the temperature increases, the Brownian motion caused the particle in the base fluids to collide more frequently at higher rates, which help the particles to transport heat faster, increasing the overall thermal conductivity [ 121 ]. However, Riahi et al [ 122 ] stated that while the Brownian motion is the main mechanism that improves the thermal conductivity of nanofluids at low temperature, it is not the main effect that contributes the thermal conductivity enhancement at a higher temperature. Instead, it involves several other mechanisms such as layering, clustering, ballistic phonon motion, thermal boundary resistance, and mass difference scattering [ 123 ].…”

Section: Thermo-physical Properties Of Nanofluidsmentioning

confidence: 99%

“…Riahi et al [ 122 ] studied the effects of temperature on thermal conductivity of Al 2 O 3 /water nanofluids and found the thermal conductivity of nanofluids increased from 4.2% to 8.6% from the base fluid at a temperature range between 25 and 45 °C. They considered the Brownian motion as the primary reason behind this enhancement.…”

Section: Thermo-physical Properties Of Nanofluidsmentioning

confidence: 99%

Recent Progress on Stability and Thermo-Physical Properties of Mono and Hybrid towards Green Nanofluids

Zainon

Azmi

2021

Micromachines

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Many studies have shown the remarkable enhancement of thermo-physical properties with the addition of a small quantity of nanoparticles into conventional fluids. However, the long-term stability of the nanofluids, which plays a significant role in enhancing these properties, is hard to achieve, thus limiting the performance of the heat transfer fluids in practical applications. The present paper attempts to highlight various approaches used by researchers in improving and evaluating the stability of thermal fluids and thoroughly explores various factors that contribute to the enhancement of the thermo-physical properties of mono, hybrid, and green nanofluids. There are various methods to maintain the stability of nanofluids, but this paper particularly focuses on the sonication process, pH modification, and the use of surfactant. In addition, the common techniques to evaluate the stability of nanofluids are undertaken by using visual observation, TEM, FESEM, XRD, zeta potential analysis, and UV-Vis spectroscopy. Prior investigations revealed that the type of nanoparticle, particle volume concentration, size and shape of particles, temperature, and base fluids highly influence the thermo-physical properties of nanofluids. In conclusion, this paper summarized the findings and strategies to enhance the stability and factors affecting the thermal conductivity and dynamic viscosity of mono and hybrid of nanofluids towards green nanofluids.

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“…The alumina/water nanofluid shows strong enhancement on the thermophysical properties of the base fluid [59]. Moreover, Al 2 O 3 nanoparticles have other advantages, such as chemical and thermal stability and excellent dispersion properties in the base fluid [60]. Figure 1 schematically shows the counter flow double-pipe system equipped with overlapped twisted tapes in inner and outer tubes.…”

Section: Problem Statementmentioning

confidence: 99%

Evaluation of Multiple Semi-Twisted Tape Inserts in a Heat Exchanger Pipe Using Al2O3 Nanofluid

Zhu

Mashayekhi

et al. 2021

Nanomaterials

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The hydrothermal performance of multiple semi-twisted tape inserts inside a heat exchanger pipe is numerically examined in three-dimensions. This study aims to find the optimum case for having the highest heat transfer enhancement with the lowest friction factor using nanofluid (Al2O3/water). A performance evaluation criterion (PEC) is defined to characterize the performance based on both friction factor and heat transfer. It was found that increasing the number of semi-twisted tapes increases the number of swirl flow streams and leads to an enhancement in the local Nusselt number as well as the friction factor. The average Nusselt number increases from 15.13 to 28.42 and the average friction factor enhances from 0.022 to 0.052 by increasing the number of the semi-twisted tapes from 0 to 4 for the Reynolds number of 1000 for the base fluid. By using four semi-twisted tapes, the average Nusselt number increases from 12.5 to 28.5, while the friction factor reduces from 0.155 to 0.052 when the Reynolds number increases from 250 to 1000 for the base fluid. For the Reynolds number of 1000, the increase in nanofluid concentration from 0 to 3% improves the average Nusselt number and friction factor by 6.41% and 2.29%, respectively. The highest PEC is equal to 1.66 and belongs to the Reynolds number of 750 using four semi-twisted tape inserts with 3% nanoparticles. This work offers instructions to model an advanced design of twisted tape integrated with tubes using multiple semi-twisted tapes, which helps to provide a higher amount of energy demand for solar applications.

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Study of thermal conductivity of synthesized Al2O3-water nanofluid by pulsed laser ablation in liquid

Cited by 65 publications

References 49 publications

The Synthesis of CuO-Based Nanofluids as a Cooling Media

The Synthesis of CuO-Based Nanofluids as a Cooling Media

Recent Progress on Stability and Thermo-Physical Properties of Mono and Hybrid towards Green Nanofluids

Evaluation of Multiple Semi-Twisted Tape Inserts in a Heat Exchanger Pipe Using Al2O3 Nanofluid

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