The enhancement of effective thermal conductivity and effective dynamic viscosity of nanofluids – A review

Azmi, W.H.; Sharma, K.V.; Mamat, Rizalman; Najafi, G.; Mohamad, Mahathir bin

doi:10.1016/j.rser.2015.09.081

Cited by 265 publications

(84 citation statements)

References 125 publications

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“…Equation (20) shows that the equivalent thermal conductivity increases with the increase in temperature and particle concentration, which qualitatively agrees with the results in many studies [25,29,32,53,54], and part of the experimental data of these literatures are shown in Figure 4. Furthermore, the enhancement of thermal conductivity also depends on the base fluid (agrees with the results in references [26,30]), which determines dielectric constant, ion charges and ion concentrations.…”

Section: Influence Factors Of Heat Transport In Nanofluidssupporting

confidence: 90%

“…When the direction of the magnetic field is not parallel to the particle velocity, the particle will suffer a magnetic force perpendicular to the particle velocity, and thus part of the vibration energy will transform into rotational kinetic energy, which will lead to a more intensive variation of the electric field. Therefore, an additional temperature rise caused by the rotational motion must be introduced into Equation (20). However, when the direction of the magnetic field is parallel to the particle velocity, the nanoparticle will not suffer magnetic force and thus Equation (20) remains the same.…”

Section: Influence Factors Of Heat Transport In Nanofluidsmentioning

confidence: 99%

“…Then, the preheated nanoparticle will heat up the local fluid leading to a higher equivalent thermal conductivity. Therefore, the temperature difference in Equation (20) is the governing parameter determining the enhancement of heat transport in nanofluids. In other words, the larger the ∆T, the larger the equivalent thermal conductivity.…”

Section: Influence Factors Of Heat Transport In Nanofluidsmentioning

confidence: 99%

“…According to Equation (20), the main factors determining the enhancement of equivalent thermal conductivity include temperature, particle charge ratio, particle mass ratio, particle concentration which is inversely proportional to 3 power of L, and the property of base fluid determined by dielectric constant, ion charges and ion concentrations. Equation (20) shows that the equivalent thermal conductivity increases with the increase in temperature and particle concentration, which qualitatively agrees with the results in many studies [25,29,32,53,54], and part of the experimental data of these literatures are shown in Figure 4.…”

Section: Influence Factors Of Heat Transport In Nanofluidsmentioning

confidence: 99%

“…For example, the thermal conductivity enhancement could reach 10%-60% or even exceed 100% in some situations [18][19][20]. Eastman et al [21] observed 44% and 60% enhancement of thermal conductivity for HE-200 oil-based Cu nanofluid (0.052%) and for water-based CuO nanofluid (5%), respectively.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Thermal-Electric Cross Coupling on Heat Transport in Nanofluids

Kang

Wang

2017

Energies

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Nanofluids have an enhanced thermal conductivity compared with their base fluid. Although many mechanisms have been proposed, few of them could give a satisfactory explanation of experimental data. In this study, a mechanism of heat transport enhancement is proposed based on the cross coupling of thermal and electric transports in nanofluids. Nanoparticles are viewed as large molecules which have thermal motion together with the molecules of the base fluid. As the nanoparticles have surface charges, the motion of nanoparticles in the high-temperature region will generate a relatively strong varying electric field through which the motion will be transported to other nanoparticles, leading to a simultaneous temperature rise of low-temperature nanoparticles. The local base fluid will thus be heated up by these nanoparticles through molecular collision. Every nanoparticle could, therefore, be considered as an internal heat source, thereby enhancing the equivalent thermal conductivity significantly. This mechanism qualitatively agrees with many experimental data and is thus of significance in designing and applying nanofluids.

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Section: Influence Factors Of Heat Transport In Nanofluidssupporting

confidence: 90%

Section: Influence Factors Of Heat Transport In Nanofluidsmentioning

confidence: 99%

Section: Influence Factors Of Heat Transport In Nanofluidsmentioning

confidence: 99%

Section: Influence Factors Of Heat Transport In Nanofluidsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Thermal-Electric Cross Coupling on Heat Transport in Nanofluids

Kang

Wang

2017

Energies

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Application of Nanofluid for Solar Stills

Asadabadi

Sheikholeslami

Momayez

2023

Nanotechnology Applications for Solar Energy Systems

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Ionic‐Liquid‐Based Nanofluids and Their Heat‐Transfer Applications: A Comprehensive Review

Lingala

2023

ChemPhysChem

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Due to their improved thermophysical characteristics, such as their strong ionic conductivity, negligible vapor pressure, and thermal stability at high temperatures, the ionic liquids (ILs) are being looked at viable contender for future heat transfer fluids. Additionally, the dispersing nanoparticles can further improve the thermophysical characteristics and thermal performance of ionic liquids, which is one of the emerging research interests to increase the heat transfer rates of the thermal devices. The latest investigations about the utilization of ionic liquid nanofluids as a heat transfer fluid is summarized in this work. These summaries are broken down into three types: (a) the thermophysical parameters including thermal conductivity, viscosity, density, and specific heat of ionic liquids (base fluids), (b) the thermophysical properties like thermal conductivity, viscosity, density, and viscosity of ionic liquids based nanofluids (IL nanofluids), and (iii) utilization of IL nanofluids as a heat transfer fluid in the thermal devices. The techniques for measuring the thermophysical characteristics and the synthesis of IL nanofluids are also covered. The suggestions for potential future research directions for IL nanofluids are summarized.

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The enhancement of effective thermal conductivity and effective dynamic viscosity of nanofluids – A review

Cited by 265 publications

References 125 publications

Effect of Thermal-Electric Cross Coupling on Heat Transport in Nanofluids

Effect of Thermal-Electric Cross Coupling on Heat Transport in Nanofluids

Application of Nanofluid for Solar Stills

Ionic‐Liquid‐Based Nanofluids and Their Heat‐Transfer Applications: A Comprehensive Review

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