Why can hybrid nanofluid improve thermal conductivity more? A molecular dynamics simulation

Guan, Haoqiang; Su, Qiaoming; Wang, Ruijin; Huang, Lizhong; Shao, Chun; Zhu, Zefei

doi:10.1016/j.molliq.2022.121178

Cited by 35 publications

(2 citation statements)

References 43 publications

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“…Based on the determination of the molecular radial distribution function around the added nanoparticles, and the diffusion coefficients of the base fluid and the Janus nanoparticles, the thermal conductivity improvement in the Janus nanoparticles containing nanofluids was attributed to the increased Brownian motion of the Janus nanoparticles that augments the likelihood of more inter-molecular collisions and enhances the heat transfer capability of the medium. Answering to the question of why can hybrid nanofluid improve thermal conductivity more, the authors Guan et al [20] evaluated the microscopic mechanism responsible for the enhancement in the thermal conductivity of hybrid nanofluids. The thermal conductivity and diffusion coefficient of copper-silver/argon hybrid nanofluid were estimated by molecular dynamics and the obtained results indicate that the peak enhancement in the thermal conductivity of nearly 70% was attained achieved for a hybrid nanofluid with copper-silver 50:50%/argon that was much larger than the around 48% and 26.4% achieved for the silver/argon and copper/argon nanofluids.…”

Section: Heat Transfer Mechanisms and Influencing Factorsmentioning

confidence: 99%

Noble Nanofluids and Their Hybrids for Heat Transfer Enrichment: A Review and Future Prospects Coverage

Pereira,

Moita,

Moreira

2023

Applied Sciences

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The novel class of fluids known by nanofluids is composed of colloidal suspensions of solid nanoparticles dispersed in a base fluid. When the solid nanoparticles are made of noble metals they can be named as noble metals nanofluids or noble nanofluids for short. This review attempts to offer a comprehensive survey along with a critical analysis of the noble metals nanofluids and their hybrids. Hence, the nanofluids having gold, silver, palladium, platinum, iridium, among others, nanoparticles are overviewed, giving emphasis to their superior thermophysical characteristics, stability, synthesis easiness, and potential applications. This work summarizes the published research findings about the noble metal nanofluids including the synthesis methods, heat transfer underlying mechanisms, and their performance evaluation in heat transfer and thermal energy storage purposes. This work intends also to provide practical insights in applications like Concentrated Solar Power systems, transformers, heat exchangers and heat pipes, cooling of electronics, among others. Also, it is highlighted the impact of the different formulations, temperature and pH values, and surfactants in the thermal conductivity, specific heat, and viscosity of these nanofluids. Besides, the interactions between the metal nanostructures and the base fluid molecules as viscosity and thermal conductivity determiners are discussed. Finally, the limitations, challenges, and prospects of the noble nanofluids are addressed such as their scalability and investment cost in large-scale applications.

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Section: Heat Transfer Mechanisms and Influencing Factorsmentioning

confidence: 99%

Noble Nanofluids and Their Hybrids for Heat Transfer Enrichment: A Review and Future Prospects Coverage

Pereira,

Moita,

Moreira

2023

Applied Sciences

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“…Based on the characteristics of metallic and non-metallic nanoparticles, it can be expected that the addition of metallic nanoparticles such as copper (Cu) into a nanofluid composed on a basis of Al 2 O 3 nanoparticles can enhance the thermophysical properties of this mixture. It has been determined that most hybrid nanofluids studied have a higher thermal conductivity than nanofluid, but Guan et al [ 7 ] further explored the reason why hybrid nanofluids have high thermal conductivity. The nanolayer densities and diffusion coefficients were calculated for various hybrid nanofluids to explain the underlying mechanism of the enhancement in the thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Mixed Convection Hybrid Nanofluid Flow Induced by an Inclined Cylinder with Lorentz Forces

et al. 2023

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Hybrid nanofluids may exhibit higher thermal conductivity, chemical stability, mechanical resistance and physical strength compared to regular nanofluids. Our aim in this study is to investigate the flow of a water-based alumina-copper hybrid nanofluid in an inclined cylinder with the impact of buoyancy force and a magnetic field. The governing partial differential equations (PDEs) are transformed into a set of similarity ordinary differential equations (ODEs) using a dimensionless set of variables, and then solved numerically using the bvp4c package from MATLAB software. Two solutions exist for both buoyancy opposing (λ < 0) and assisting (λ > 0) flows, whereas a unique solution is found when the buoyancy force is absent (λ = 0). In addition, the impacts of the dimensionless parameters, such as curvature parameter, volume fraction of nanoparticles, inclination angle, mixed convention parameter, and magnetic parameter are analyzed. The results of this study compare well with previously published results. Compared to pure base fluid and regular nanofluid, hybrid nanofluid reduces drag and transfers heat more efficiently.

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Developing a Novel Hybrid Nanofluid Preparation Method Using the Droplet Generation Method: Predicting the Thermal Conductivity, Viscosity, and Magnetic Properties Compared to the Conventional Two-Step Method

Li,

Hejazi Dehaghani,

Karimipour

2024

Int J Thermophys

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Why can hybrid nanofluid improve thermal conductivity more? A molecular dynamics simulation

Cited by 35 publications

References 43 publications

Noble Nanofluids and Their Hybrids for Heat Transfer Enrichment: A Review and Future Prospects Coverage

Noble Nanofluids and Their Hybrids for Heat Transfer Enrichment: A Review and Future Prospects Coverage

Mixed Convection Hybrid Nanofluid Flow Induced by an Inclined Cylinder with Lorentz Forces

Developing a Novel Hybrid Nanofluid Preparation Method Using the Droplet Generation Method: Predicting the Thermal Conductivity, Viscosity, and Magnetic Properties Compared to the Conventional Two-Step Method

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