Particle-shape-, temperature-, and concentration-dependent thermal conductivity and viscosity of nanofluids

Mirmohammadi, Seyed Aliakbar; Behi, Mohammadreza; Gan, Yixiang; Shen, Luming

doi:10.1103/physreve.99.043109

Cited by 35 publications

(10 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To exemplify the influence of nanoparticle shape, Figure 5a shows the results obtained with three different nanoparticle shapes in a TiO 2 water-based nanofluid [15]: cubic, rod and spherical. Passing from cubic to spherical nanoparticles, the thermal conductivity significantly enhances by around 20% at 303 K up to around 60% at 353 K. The authors suggest this result is related to the different surface to volume ratios for the different shapes, as highlighted also by [47], which enhance the heat transfer. At the same time, viscosity is also influenced by nanoparticle shape.…”

Section: Nanoparticle Shapementioning

confidence: 95%

“…Besides size, the shape of nanoparticles is another morphological aspect that can influence the properties of nanofluids. Some studies are available in the literature showing this effect on thermal conductivity and viscosity [15,17,47]. To exemplify the influence of nanoparticle shape, Figure 5a shows the results obtained with three different nanoparticle shapes in a TiO2 water-based nanofluid [15]: cubic, rod and spherical.…”

Section: Nanoparticle Shapementioning

confidence: 99%

See 1 more Smart Citation

Analysis of the Parameters Required to Properly Define Nanofluids for Heat Transfer Applications

Bobbo

Buonomo

Manca

et al. 2021

Fluids

View full text Add to dashboard Cite

Nanofluids are obtained by dispersing nanoparticles and dispersant, when present, in a base fluid. Their properties, in particular their stability, however, are strictly related to several other parameters, knowledge of which is important to reproduce the nanofluids and correctly interpret their behavior. Due to this complexity, the results appear to be frequently unreliable, contradictory, not comparable and/or not repeatable, in particular for the scarcity of information on their preparation. Thus, it is essential to define what is the minimum amount of information necessary to fully describe the nanofluid, so as to ensure the possibility of reproduction of both their formulation and the measurements of their properties. In this paper, a literature analysis is performed to highlight what are the most important parameters necessary to describe the configuration of each nanofluid and their influence on the nanofluid’s properties. A case study is discussed, analyzing the information reported and the results obtained for the thermophysical properties of nanofluids formed by water and TiO2 nanoparticles. The aim is to highlight the differences in the amount of information given by the different authors and exemplify how results can be contradictory. A final discussion gives some suggestions on the minimum amount of information that should be given on a nanofluid to have the possibility to compare results obtained for similar nanofluids and to reproduce the same nanofluid in other laboratories.

show abstract

Section: Nanoparticle Shapementioning

confidence: 95%

Section: Nanoparticle Shapementioning

confidence: 99%

Analysis of the Parameters Required to Properly Define Nanofluids for Heat Transfer Applications

Bobbo

Buonomo

Manca

et al. 2021

Fluids

View full text Add to dashboard Cite

show abstract

“…PCM is also combined by nanoparticle [26][27][28][29], heat pipe [13], fin, and mesh [30,31] because of its thermal properties. The concept of PCM for battery cooling was initially used by Al-Hallaj and Selman [32].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Passive Thermal Management Systems for Electric Vehicles

et al. 2021

View full text Add to dashboard Cite

Lithium-ion (Li-ion) batteries have emerged as a promising energy source for electric vehicle (EV) applications owing to the solution offered by their high power, high specific energy, no memory effect, and their excellent durability. However, they generate a large amount of heat, particularly during the fast discharge process. Therefore, a suitable thermal management system (TMS) is necessary to guarantee their performance, efficiency, capacity, safety, and lifetime. This study investigates the thermal performance of different passive cooling systems for the LTO Li-ion battery cell/module with the application of natural convection, aluminum (Al) mesh, copper (Cu) mesh, phase change material (PCM), and PCM-graphite. Experimental results show the average temperature of the cell, due to natural convection, Al mesh, Cu mesh, PCM, and PCM-graphite compared with the lack of natural convection decrease by 6.4%, 7.4%, 8.8%, 30%, and 39.3%, respectively. In addition, some numerical simulations and investigations are solved by COMSOL Multiphysics®, for the battery module consisting of 30 cells, which is cooled by PCM and PCM-graphite. The maximum temperature of the battery module compared with the natural convection case study is reduced by 15.1% and 17.3%, respectively. Moreover, increasing the cell spacing in the battery module has a direct effect on temperature reduction.

show abstract

“…Most LHTES suffers low efficiency of the thermal storage because of the low thermal conductivity of the PCMs [21,26]. The main thermo-physical properties of PCMs, including thermal conductivity and latent heat, highly affect the performance of the LHTES [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

“…A number of techniques have been utilized by researchers to increase efficiency enhancements of PCMs. Adding highly thermally conductive particles [32], nanomaterials [31,[33][34][35], fins [36], and heat pipes [37][38][39] are some examples of tools used to improve the thermal conductivity of the medium. Heat pipe systems have been widely used in various energy storage and heat transfer systems because of their suitability in the role of heat delivery and passive operation [40][41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the Thermal Energy Storage Using Heat-Pipe-Assisted Phase Change Material

Behi

Ghanbarpour

et al. 2021

Energies

Self Cite

View full text Add to dashboard Cite

Usage of phase change materials’ (PCMs) latent heat has been investigated as a promising method for thermal energy storage applications. However, one of the most common disadvantages of using latent heat thermal energy storage (LHTES) is the low thermal conductivity of PCMs. This issue affects the rate of energy storage (charging/discharging) in PCMs. Many researchers have proposed different methods to cope with this problem in thermal energy storage. In this paper, a tubular heat pipe as a super heat conductor to increase the charging/discharging rate was investigated. The temperature of PCM, liquid fraction observations, and charging and discharging rates are reported. Heat pipe effectiveness was defined and used to quantify the relative performance of heat pipe-assisted PCM storage systems. Both experimental and numerical investigations were performed to determine the efficiency of the system in thermal storage enhancement. The proposed system in the charging/discharging process significantly improved the energy transfer between a water bath and the PCM in the working temperature range of 50 °C to 70 °C.

show abstract

Particle-shape-, temperature-, and concentration-dependent thermal conductivity and viscosity of nanofluids

Cited by 35 publications

References 62 publications

Analysis of the Parameters Required to Properly Define Nanofluids for Heat Transfer Applications

Analysis of the Parameters Required to Properly Define Nanofluids for Heat Transfer Applications

Comprehensive Passive Thermal Management Systems for Electric Vehicles

Enhancement of the Thermal Energy Storage Using Heat-Pipe-Assisted Phase Change Material

Contact Info

Product

Resources

About