Atomistic-mesoscale interfacial resistance based thermal analysis of carbon nanotube systems

Unnikrishnan, Vinu; Banerjee, Debjyoti; Reddy, J. N.

doi:10.1016/j.ijthermalsci.2007.10.012

Cited by 27 publications

(28 citation statements)

References 42 publications

(97 reference statements)

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“…A monotonic decay of the temperature, which follows an exponential order, is observed in these simulations. The interfacial thermal resistance value is estimated for single-walled nanotube embedded in LDPE as 5:05 Â 10 À8 m 2 K=W (Unnikrishnan et al 2008a(Unnikrishnan et al , 2009). The effect of the defects in single-walled nanotubes is found to decrease the interfacial thermal resistance values to 3.85 Â 10 À8 m 2 K/W and 4.42 Â 10 À8 m 2 K/W for one and two defects, respectively (Unnikrishnan et al 2008a(Unnikrishnan et al , 2009).…”

Section: Resultsmentioning

confidence: 99%

“…7.3 Cooling profiles of pristine single-walled nanotube in LDPE thermal conductivity, and the size of the nanoparticle (Unnikrishnan et al 2008a(Unnikrishnan et al , 2009. It should be noted that, because of the interfacial boundary resistance, there exists a strong anisotropy in the thermal behavior of the nanomaterials.…”

Section: Resultsmentioning

confidence: 99%

“…The effect of the size of the nanoparticles on the thermal properties was developed by Duan and Karihaloo (2007). The effect of the size of the nanoparticles on the thermal properties of nanocomposite systems was studied using atomistic simulations of the interfacial thermal resistance (Unnikrishnan et al 2008a(Unnikrishnan et al , b, 2009). This was further extended to the study of the size parameter for different types of nanotube composite systems (Unnikrishnan 2015).…”

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confidence: 99%

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Recent Developments in Multiscale Thermomechanical Analysis of Nanocomposites

Reddy

Unnikrishnan

2016

Advances in Nanocomposites

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Multifunctional nanocomposite materials have been used extensively in aerospace, mechanical, civil engineering industries, and other engineering applications. This is mainly due to the enhanced mechanical characteristics such as high strength-to-weight ratio and the unique thermal and physiochemical properties of these nanostructures. It has been reported that there are significant improvements in the thermal conductivity of composite structures with the addition of low volume fractions of graphene. To understand and develop efficient composite systems with desired thermal characteristics, it is necessary to develop accurate thermal transport models of these advanced composite systems. In this chapter, the authors discuss some of the recent developments in multiscale modeling of the thermal and mechanical properties of advanced nanocomposite systems. To enhance the theoretical model development discussed in this chapter, the authors have also included some relevant works from the literature.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Recent Developments in Multiscale Thermomechanical Analysis of Nanocomposites

Reddy

Unnikrishnan

2016

Advances in Nanocomposites

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“…Surprisingly, even though carbon nanotube has higher thermal conductivity than silicon, higher levels of enhancement of pool boiling heat flux (especially critical heat flux) was observed for heaters with silicon nanofins. 31 Subsequently, Singh et al 33 , Unnikrishnan et al 42 , and Singh 43 , and showed that the Kapitza Resistance ("R k ") for carbon nanotubes at the interface with the working fluid is ~1000 times higher than that for the silicon nanofin structures. 33,42,43 Therefore, Kapitza Resistance was identified as the dominant parameter for determining the level of heat flux enhancement for the nanocoatings.…”

Section: 32837mentioning

confidence: 99%

“…31 Subsequently, Singh et al 33 , Unnikrishnan et al 42 , and Singh 43 , and showed that the Kapitza Resistance ("R k ") for carbon nanotubes at the interface with the working fluid is ~1000 times higher than that for the silicon nanofin structures. 33,42,43 Therefore, Kapitza Resistance was identified as the dominant parameter for determining the level of heat flux enhancement for the nanocoatings. Hence, it is not surprising that the silicon nanofins yield higher values of critical heat flux than carbon nanotubes, despite the fact that carbon has a higher thermal conductivity than silicon.…”

Section: 32837mentioning

confidence: 99%

Numerical Investigation of the Effect of Chirality of Carbon Nanotube on the Interfacial Thermal Resistance

Hu¹

2013

J Nanofluids

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Concentrated Solar Power (CSP) systems are used widely as a stable and reliable renewable source of energy. However, intermittency of this power source and the variability in demand for electrical power creates challenges that necessitate the integration with energy storage for reliable dispatch of power. Thermal Energy Storage (TES) systems provide a cheap, cost-effective and reliable option for energy storage in renewable power delivery systems. Due to their low vapor pressures at elevated temperatures, molten salts and their eutectics are used in conventional high temperature thermal energy storage (TES) systems and also as coolants for energy conversion, such as in power tower configurations that are typically used in CSP applications. A major drawback of the molten salts is their relatively poor thermo-physical properties, which may lead to lower systemic efficiencies in CSP/TES. Recent reports in the literature have shown that doping molten salts with nanoparticles at minute concentrations (typically less than 5% mass fraction and ideally at less than 1-2% mass fraction) can significantly enhance the thermo-physical properties of these nanomaterial (also termed as "nanocomposites" in solid state and "nanofluids" in liquid state). The dominant factor that controls the resultant thermo-physical properties of these nanomaterials is the interfacial thermal resistance (or Kapitza Resistance "R k ") that impedes the heat transfer between the nanoparticle surface and the bulk solvent molecules.ii In this study, the interfacial thermal resistance between a carbon nanotube (CNT) and carbonate molten salt eutectics were calculated by using numerical models that were then implemented in Molecular Dynamics (MD) simulations. The estimates for "R k " obtained from these simulations enabled the prediction of the optimum dimensions of the nanoparticles for maximizing the thermo-physical properties of the mixture, i.e. thermal conductivity and specific heat capacity values of these nanomaterial. The simulations were restricted to the carbonate salt eutectic, which is composed of a molar ratio of 62:38 for lithium carbonate (Li 2 CO 3 ) and potassium carbonate (K 2 CO 3 ). In this study, parametric simulations were performed to estimate the values of "R k " by varying the chirality of a single walled CNT (i.e, for armchair, chiral, and zig-zag CNT). The results show that the Kapitza resistance of the CNT is significantly affected by the change in the chirality of the CNT.

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Laminates: Developments in the Multiscale Analysis of Multifunctional Nanocomposite Materials

Reddy

Unnikrishnan

2011

Wiley Encyclopedia of Composites

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Analysis of multiscale nanocomposite materials continues to evolve with new developments in several fronts. Most of the recent advances include theoretical developments in improving the accuracy and efficiency of multiple physics‐based mathematical and computational models, and also generation of new defect‐free nanomaterial systems for large‐scale applications. In this article, the authors discuss some of the recent developments on multiscale mechanical and thermal analysis of nanotube and nanocomposite systems. This article also examines the effect of interfacial thermal characteristics on the overall effective thermal properties of a composite system, using a multiscale computational strategy involving atomistic simulations coupled with mesoscale thermal analysis models. Apart from the various computational models described in this article, several relevant works from literature are also cited to enhance the developed theoretical models discussed in this article.

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Atomistic-mesoscale interfacial resistance based thermal analysis of carbon nanotube systems

Cited by 27 publications

References 42 publications

Recent Developments in Multiscale Thermomechanical Analysis of Nanocomposites

Recent Developments in Multiscale Thermomechanical Analysis of Nanocomposites

Numerical Investigation of the Effect of Chirality of Carbon Nanotube on the Interfacial Thermal Resistance

Laminates: Developments in the Multiscale Analysis of Multifunctional Nanocomposite Materials

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