Mechanisms for thermal conduction in molten salt-based nanofluid

Cui, Liu; Yu, Qingsheng; Wei, Gaosheng; Du, Xiaoze

doi:10.1016/j.ijheatmasstransfer.2022.122648

Cited by 20 publications

(5 citation statements)

References 38 publications

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“…This indicates that the change in heat conduction of aggregated nanofluids cannot be explained by the semi-solid layer. Similar results have been found in dispersed nanofluids [29,30].…”

Section: Semi-solid Layersupporting

confidence: 89%

“…As can be seen, the contribution of λ KK is small, which means Brownian motion has minimal effect on thermal conductivity. Similar results have been found in dispersed nanofluids [30]. Moreover, the enhancement in thermal conductivity of aggregated nanofluids is primarily dominated by λ CC , which is larger than 60%.…”

Section: Contributions Of Different Energy Compositions To Specific H...supporting

confidence: 86%

“…This indicates that the change in heat conduction of aggregated nanofluids cannot be explained by the semi-solid layer. Similar results have been found in dispersed nanofluids [29,30]. Apart from the addition of nanoparticles, the aggregate morphology can also provide a degree of freedom to promote the heat transfer and energy conversion efficiency of molten salt.…”

Section: Semi-solid Layersupporting

confidence: 80%

“…Due to the limitations of computer resources, four spherical SiO 2 nanoparticles with a diameter of 18 Å were created, as shown in Figure 1b. Nanoparticle diameters around 2 nm have been used in previous MD simulations [29,30]. The nanoparticles were randomly filled in the solar salt box to obtain a dispersed nanofluid, as shown in Figure 1c.…”

Section: Simulation Model and Methodsmentioning

confidence: 99%

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Effect of Morphological Characteristics of Aggregates on Thermal Properties of Molten Salt Nanofluids

Zhang,

Zhu,

Chen

et al. 2024

Energies

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Molten salt-based nanofluid is a thermal storage and heat transfer medium for concentrated solar thermal power plants formed by adding nanoparticles to molten salt, which can enhance the thermal performance of molten salt. However, the nanoparticles tend to aggregate in nanofluids, causing changes in thermal properties. In this work, molecular dynamics simulations were used to study the effect of morphological characteristics of aggregates on the thermal conductivity and specific heat capacity of molten salt-based nanofluids. The results show that the aggregated nanoparticles cause a greater increase in thermal conductivity and specific heat capacity than dispersed nanoparticles. Additionally, the increase in fractal dimension leads to thermal conductivity reduction, while there is no clear correlation between the fractal dimension and specific heat capacity. New insights into the thermal properties of aggregated nanofluids are provided by analyzing the contribution of material components, heat flux fluctuation modes, and energy compositions. It is found that the thermal conductivity of aggregated nanofluids is mainly dominated by the base liquid and collision term. However, the specific heat is not related to the variation in the contribution of different energy compositions. Moreover, compared to the dispersed nanofluid, the increased specific heat capacity of aggregated nanofluids is attributed to the thicker semi-solid layer. This study provides guidance for the design and control of the thermal properties of molten salt-based nanofluids.

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“…This indicates that the change in heat conduction of aggregated nanofluids cannot be explained by the semi-solid layer. Similar results have been found in dispersed nanofluids [29,30].…”

Section: Semi-solid Layersupporting

confidence: 89%

Section: Contributions Of Different Energy Compositions To Specific H...supporting

confidence: 86%

Section: Semi-solid Layersupporting

confidence: 80%

Section: Simulation Model and Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Morphological Characteristics of Aggregates on Thermal Properties of Molten Salt Nanofluids

Zhang,

Zhu,

Chen

et al. 2024

Energies

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“…In solar-thermal storage research directions, intensive efforts were mainly devoted to incorporating SiO 2 , Al 2 O 3 , MgO, and other nanoparticles into commercial solar-thermal molten salts that have been employed for thermal storage at medium-to-high temperatures [117,118]. For example, Nithiyanantham et al [119] found that while pure Al 2 O 3 and SiO 2 particles precipitated or floated within solar salts (NaNO 3 -KNO 3 ) after heating the nanofluids at 400 • C for 24 h (Figure 7b), the core-shell SiO 2 @Al 2 O 3 could create steric hindrance and obtain an intermediate density matching that of the molten salts thereby reducing agglomeration and sedimentation tendency.…”

Section: Molten Salt-based Nanofluidsmentioning

confidence: 99%

A Review on Recent Progress in Preparation of Medium-Temperature Solar-Thermal Nanofluids with Stable Dispersion

Zhang

Xia

et al. 2023

Nanomaterials

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Direct absorption of sunlight and conversion into heat by uniformly dispersed photothermal nanofluids has emerged as a facile way to efficiently harness abundant renewable solar-thermal energy for a variety of heating-related applications. As the key component of the direct absorption solar collectors, solar-thermal nanofluids, however, generally suffer from poor dispersion and tend to aggregate, and the aggregation and precipitation tendency becomes even stronger at elevated temperatures. In this review, we overview recent research efforts and progresses in preparing solar-thermal nanofluids that can be stably and homogeneously dispersed under medium temperatures. We provide detailed description on the dispersion challenges and the governing dispersion mechanisms, and introduce representative dispersion strategies that are applicable to ethylene glycol, oil, ionic liquid, and molten salt-based medium-temperature solar-thermal nanofluids. The applicability and advantages of four categories of stabilization strategies including hydrogen bonding, electrostatic stabilization, steric stabilization, and self-dispersion stabilization in improving the dispersion stability of different type of thermal storage fluids are discussed. Among them, recently emerged self-dispersible nanofluids hold the potential for practical medium-temperature direct absorption solar-thermal energy harvesting. In the end, the exciting research opportunities, on-going research need and possible future research directions are also discussed. It is anticipated that the overview of recent progress in improving dispersion stability of medium-temperature solar-thermal nanofluids can not only stimulate exploration of direct absorption solar-thermal energy harvesting applications, but also provide a promising means to solve the fundamental limiting issue for general nanofluid technologies.

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MS3, physical properties, and formation mechanism of TiV1/3Cr1/3Nb1/3AlC powders: Experimental and first-principles investigation

Zhang,

Zhou,

et al. 2023

Ceramics International

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Mechanisms for thermal conduction in molten salt-based nanofluid

Cited by 20 publications

References 38 publications

Effect of Morphological Characteristics of Aggregates on Thermal Properties of Molten Salt Nanofluids

Effect of Morphological Characteristics of Aggregates on Thermal Properties of Molten Salt Nanofluids

A Review on Recent Progress in Preparation of Medium-Temperature Solar-Thermal Nanofluids with Stable Dispersion

MS3, physical properties, and formation mechanism of TiV1/3Cr1/3Nb1/3AlC powders: Experimental and first-principles investigation

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