A review on molten-salt-based and ionic-liquid-based nanofluids for medium-to-high temperature heat transfer

Wang, Wei; Wu, Zan; Li, Bingxi; Sundén, Bengt

doi:10.1007/s10973-018-7765-y

Cited by 65 publications

(17 citation statements)

References 96 publications

(114 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As a result of these features and advantages, ILs are used in a wide range of applications such as catalyst [9][10][11][12][13][14], pre-treatment of biomass [15][16][17], absorbent [18][19][20], gas sensors [21], electrolyte [22][23][24], and membrane separation [25][26][27]. Among all of the applications, high-temperature utilization accounts for the vast majority, including high-temperature lubricants [28][29][30], solvents for high-temperature organic reactions [31], heat-transfer fluids [32,33], and thermal energy storage [34,35]. Although ILs are generally considered to be thermally stable, yet their stability is influenced seriously by a lot of factors.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability of Ionic Liquids: Current Status and Prospects for Future Development

Cheng

2021

Processes

110

View full text Add to dashboard Cite

Ionic liquids (ILs) are the safest solvent in various high-temperature applications due to their non-flammable properties. In order to obtain their thermal stability properties, thermogravimetric analysis (TGA) is extensively used to analyze the kinetics of the thermal decomposition process. This review summarizes the different kinetics analysis methods and finds the isoconversional methods are superior to the Arrhenius methods in calculating the activation energy, and two tools—the compensation effect and master plots—are suggested for the calculation of the pre-exponential factor. With both parameters, the maximum operating temperature (MOT) can be calculated to predict the thermal stability in long-term runnings. The collection of thermal stability data of ILs with divergent cations and anions shows the structure of cations such as alkyl side chains, functional groups, and alkyl substituents will affect the thermal stability, but their influence is less than that of anions. To develop ILs with superior thermal stability, dicationic ILs (DILs) are recommended, and typically, [C4(MIM)2][NTf2]2 has a decomposition temperature as high as 468.1 °C. For the convenience of application, thermal stability on the decomposition temperature and thermal decomposition activation energy of 130 ILs are summarized at the end of this manuscript.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal Stability of Ionic Liquids: Current Status and Prospects for Future Development

Cheng

2021

Processes

110

View full text Add to dashboard Cite

show abstract

“…Nanofluid physical properties are obtained from the Eqs. (15) , (16) , (17) , and (18) [ 19 , 33 , 34 ]:

where:…”

Section: Resultsmentioning

confidence: 99%

An optimisation study of a solar tower receiver: the influence of geometry and material, heat flux, and heat transfer fluid on thermal and mechanical performance

Shatnawi

Lim

Ismail

et al. 2021

Heliyon

View full text Add to dashboard Cite

The solar receiver is considered the cornerstone of the solar tower power system. In particular, it receives hightemperature heat flux rays, and extracts the maximum heat energy to be transferred to the heat transfer fluid, while minimising any thermal and mechanical stresses. Reducing the solar receiver size helps to reduce the loss of spillage; consequently, the thermal stress increases. Using a solar receiver with inserted triangular longitudinal fins enhances the heat transfer as well as strengthens the receiver tube. This study aims to optimise the number of fins, heat flux aiming point, heat transfer fluid, nanoparticle effect with molten salt as the base fluid, and type of receiver material. Non-uniform heat flux with the cosine and Gaussian effects have been considered. When the number of fins (N) increases, the maximum temperature (T max ) decreases and the heat transfer is enhanced. When N ¼ 20, T max ¼ 656.4 K and when N ¼ 1, T max ¼ 683.55, while the efficiency for N ¼ 1 is greater by 3% compared to when N ¼ 20. The cosine distribution of heat flux has a higher maximum temperature than the Gaussian distribution by 29% and is 102% higher in receiver efficiency. The thermal efficiency when the heat flux is aimed at the middle point of the receiver is higher by 10% compared with a lower or upper aiming point. Using Al 2 O 3 nanoparticles with a concentration of 0.5 wt.% increases the thermal efficiency by 14% more than when using pure molten salt when Re ¼ 38000. Using liquid sodium is not required to monitor the peak heat flux, and by adding triangular fins the displacement and thermal stress are 6.5 % lower compared to a smooth receiver.

show abstract

“…It appears that both ultrasonication time and its power are effective on dispersion and thermal conductivity enhancement. Also, the ultrasonic probe devices have better performance than ultrasonic bath devices [94,95]. Among the mentioned techniques, ultrasonic treatment is an optimal technique from operation cost and time point of view.…”

Section: -1 Preparation Des-based Nanofluidsmentioning

confidence: 99%

Deep eutectic solvents (DESs): A short overview of the thermophysical properties and current use as base fluid for heat transfer nanofluids

Jafari

Fatemi

Estellé

2021

Journal of Molecular Liquids

View full text Add to dashboard Cite

Nowadays, different types of strategies are proposed and tested to find the best scenario for upgrading the productivity of heat transfer fluids, especially nanofluids. Some optimum empirical conditions demonstrated that the best size, shape, and nature of nanoparticles and their appropriate dispersion have positive influences on nanofluid thermal conductivity improvements. Therefore, the specific physicochemical properties of the base fluid can be taken into account as one of the decisive factors in heat transfer operations. Deep eutectic solvents (DESs) are nominated as valuable materials to meet the demands for sustainable ecological processes and open opportunities for overcoming the limitations of conventional fluids.The purpose of this study is to briefly introduce the DESs for evaluating their thermal potential applicability and their use to produce nanofluids. DES-based nanofluids represent a new and creative type of heat transfer fluids that possess high potential in different target applications and are not harmful to the environment. This type of nanofluid has higher thermal properties than the base DESs. Increasing the temperature and the volume fraction of nanoparticles lead to further increment in their thermal properties. In this study, the chemical structure and preparation method have been addressed for the DES and DES-based nanofluids. Also, the theoretical approaches have been considered for modeling and predicting their behavior. A discussion was extended to investigate the usage of DES as host fluid for producing nanofluids, and its advantages and drawbacks are also presented. It is deduced that the DES-based nanofluids are one of the smart choices for the progression of nanofluids and give the most promising results for application in heat transport fluids. The contents may shed light on a detailed awareness of the heat transfer potential of the DESs.

show abstract

A review on molten-salt-based and ionic-liquid-based nanofluids for medium-to-high temperature heat transfer

Cited by 65 publications

References 96 publications

Thermal Stability of Ionic Liquids: Current Status and Prospects for Future Development

Thermal Stability of Ionic Liquids: Current Status and Prospects for Future Development

An optimisation study of a solar tower receiver: the influence of geometry and material, heat flux, and heat transfer fluid on thermal and mechanical performance

Deep eutectic solvents (DESs): A short overview of the thermophysical properties and current use as base fluid for heat transfer nanofluids

Contact Info

Product

Resources

About