Effects of interfacial layer on thermal conductivity enhancement of solar salt-based nanofluids: Insights from molecular dynamics simulations

Rao, Zhenghua; Bai, Rui; Yang, Kai; Zhou, Tian

doi:10.1016/j.csite.2022.102087

Cited by 20 publications

(5 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is because of the formation of molecular adsorption layer on the surface of nanoparticles and the disturbance of nanoparticles reduces the height of boundary layer, which enhances the flow boiling heat transfer coefficient of the nanorefrigerant. 33 Exergy losses in the evaporator is also one of the factors in enhances the flow boiling heat transfer coefficient of nanorefrigerant. The exergy loss in the evaoprator is occurred due the irreversibilities of a process in refrigeration system.…”

Section: Resultsmentioning

confidence: 99%

The effects of Multiwalled Carbon Nanotube to the performance of a refrigeration system

Cassim,

Hairuddin,

Cut

2024

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

By incorporating nanofluid technology and nanolubricants into compressors, the performance can be enhanced while also lowering worldwide fuel consumption and aiming at developing cleaner, more efficient energy sources and uses. The globe is being confronted with energy security issues and heating, cooling and HVAC systems highly contribute to it. Hence, it is critical to save energy and improve the efficiency of the refrigeration cycle. This study presents experimental and theoretical findings in order to investigate the effect of Polyester (POE)-oil based multiwalled Carbon Nanotube (MWCNT) nanolubricant on the Coefficient of Performance (COP) of a refrigeration system. The objectives of this study is to analyze the stability of MWCNT nanofluids, to obtain the COP of a refrigeration cycle run with pure POE oil and MWCNT nanofluids with different concentrations respectively. The experiment was conducted by preparing 0.55, 0.65 and 0.70 g/l MWCNT nanofluid by using the two step method. The most effective concentration used in the refrigeration system was referred to the one that resulted in the highest COP. It was determined from the experiment that 0.55 g/l MWCNT nanofluid resulted in a higher COP of 5.766 as compared to the other two concentrations. Besides, it showed an improvement of 34.6% in COP as compared to the COP of using pure POE oil in the refrigeration system, which was found to be 4.285. The 0.65 g/l and 0.70 g/l concentration of MWCNT resulted in a COP of 5.618 and 5.617, respectively. The compressor work was also analyzed and was found to be reduced noticeably after adding MWCNT nanoparticles. Hence it can be concluded that the increment of MWCNT concentration in nanofluids increases the COP of the refrigeration system but only up to a certain limit of concentration.

show abstract

Section: Resultsmentioning

confidence: 99%

The effects of Multiwalled Carbon Nanotube to the performance of a refrigeration system

Cassim,

Hairuddin,

Cut

2024

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…This nanofluid's flow over a revolving disc served as the context for the analysis. Rao et al [13] conducted in-depth research on the interaction of an interfacial layer on the improvement of thermal conductivity in nanofluids made with solar salt as the base fluid. Sheikholeslami [14] provided numerical outcomes for the concentrated photovoltaic solar system in existence of paraffin adding MWCNT nanoparticle, which are relevant for studying the flow over the solar collectors.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic and ohmic effects on nanofluid flow via permeability rotative disk: significant interparticle radial and nanoparticle radius

Shamshuddin,

Panda,

Pattnaik

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

The significance of interparticle spacing and nanoparticle radius for the case of single-phase nanofluid flow has often been neglected. Tremendous applications of this phenomenon can be witnessed in different fields, especially in electron microscopes, heat exchange processes, and many others. This research highlights this vital aspect of Ohmic heating in nanofluid flow over a spinning disk. To ensure the novelty, a ferromagnetic nanoparticle (Manganese ferrite) has been incorporated to examine interparticle spacing and particle radius to explore the features of heat transfer. The ferromagnetic nanofluids are vital in carriers for drug delivery systems, in cancer treatment, design of systems for hyperthermia therapy, in microfluidic devices used for chemical synthesis, etc. The quantiles of dimensional equations are converted into dimensionless ones by adopting similarity transformations and to solve highly coupled nonlinear equations numerically, built-in bvp5c MATLAB tool is utilized. The effect of a few revealed factors, the velocity and temperature distributions, are examined via visualization. Furthermore, streamlined plots are also visualized. The outcomes produced showed excellent agreement with those made in the literature in the same direction by assuming some exceptional cases on different gradients. Further, the outstanding results are reported as; the permeability of the surface produces the suction velocity and the enhanced suction velocity attenuates the fluid velocity in either of the case of pure and nanofluid. The increase in thermal radiation boost up the heat transfer rate whereas the augmentation in the Eckert number retards it significantly.

show abstract

“…Thermal energy storage (TES) is a necessary part of a CSP plant, where stored heat can be used for continuous operation of the CSP plant during the night and on cloudy days [2] and, thus, help to improve power supply quality [3]. Molten salts are widely used as the thermal storage material and heat transfer medium in CSP systems due to their high latent heat, low vapor pressure, wide operating temperature range, and low cost [4]. However, the low thermal conductivity of molten salts reduces the charge-discharge rate and decreases the efficiency of TES systems.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang,

Zhu,

Chen

et al. 2024

Energies

View full text Add to dashboard Cite

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.

show abstract

Effects of interfacial layer on thermal conductivity enhancement of solar salt-based nanofluids: Insights from molecular dynamics simulations

Cited by 20 publications

References 46 publications

The effects of Multiwalled Carbon Nanotube to the performance of a refrigeration system

The effects of Multiwalled Carbon Nanotube to the performance of a refrigeration system

Ferromagnetic and ohmic effects on nanofluid flow via permeability rotative disk: significant interparticle radial and nanoparticle radius

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

Contact Info

Product

Resources

About