Reconstruction and modeling of 3D percolation networks of carbon fillers in a polymer matrix

Chiavazzo, Eliodoro; Asinari, Pietro

doi:10.1016/j.ijthermalsci.2010.07.019

Cited by 31 publications

(18 citation statements)

References 26 publications

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“…Moreover, Brownian motion [89][90][91][92][93][94], interfacial thermal resistance (i.e. Kapitza Resistance) [95] and the formation of thermal percolation paths due to particle aggregation [96] were also proposed for understanding the anomalous thermal properties of nanofluids [38,[97][98][99]. After several experiments and some controversies, it is now well recognized that the two main features characterizing the effective thermal conductivity of nanofluids are the Kapitza resistance at the nanoparticlefluid interface [100] as well as the role of aggregation and aggregate morphologies [101].…”

Section: Dominating Heat and Mass Flow Mechanismsmentioning

confidence: 99%

A review on the heat and mass transfer phenomena in nanofluid coolants with special focus on automotive applications

Bigdeli

Fasano

Cardellini

et al. 2016

Renewable and Sustainable Energy Reviews

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116

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Engineered suspensions of nanosized particles (nanofluids) may be characterized by enhanced thermal properties. Due to the increasing need for ultrahigh performance cooling systems, nanofluids have been recently investigated as next-generation coolants for car radiators. However, the multiscale nature of nanofluids implies nontrivial relations between their design characteristics and the resulting thermo-physical properties, which are far from being fully understood. In this work, the role of fundamental heat and mass transfer mechanisms governing thermo-physical properties of nanofluids is reviewed, both from experimental and theoretical point of view. Particular focus is devoted to highlight the advantages of using nanofluids as coolants for automotive heat exchangers, and a number of design guidelines is reported for balancing thermal conductivity and viscosity enhancement in nanofluids. We hope this review may help further the translation of nanofluid technology from small-scale research laboratories to industrial application in the automotive sector.

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Section: Dominating Heat and Mass Flow Mechanismsmentioning

confidence: 99%

A review on the heat and mass transfer phenomena in nanofluid coolants with special focus on automotive applications

Bigdeli

Fasano

Cardellini

et al. 2016

Renewable and Sustainable Energy Reviews

Self Cite

116

View full text Add to dashboard Cite

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“…An example is given by some trends in the mesoscopic numerical methods. In particular, the lattice Boltzmann method [12][13][14][15][16] is a powerful numerical method applied much beyond rarefied flows, including thermal radiation [17], thermal conduction [18], combustion [19][20][21][22], porous media [23,24], multi-component flows [25,26] and turbulence [27], to mention a few. Pertinently to this paper, the entropic lattice Boltzmann method was invented by Ilya Karlin and co-workers in 1998, by applying the maximum entropy principle to lattice kinetic equations [28].…”

Section: Introductionmentioning

confidence: 99%

Overview of the entropy production of incompressible and compressible fluid dynamics

Asinari

Chiavazzo

2015

Meccanica

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In this paper, we present an overview of the entropy production in fluid dynamics in a systematic way. First of all, we clarify a rigorous derivation of the incompressible limit for the Navier-Stokes-Fourier system of equations based on the asymptotic analysis, which is a very well known mathematical technique used to derive macroscopic limits of kinetic equations (Chapman-Enskog expansion and Hilbert expansion are popular methodologies). This allows to overcome the theoretical limits of assuming that the material derivative of the density simply vanishes. Moreover, we show that the fundamental Gibbs relation in classical thermodynamics can be applied to non-equilibrium flows for generalizing the entropy and for expressing the second law of thermodynamics in case of both incompressible and compressible flows. This is consistent with the Thermodynamics of Irreversible Processes (TIP) and it is an essential condition for the design and optimization of fluid flow devices. Summarizing a theoretical framework valid at different regimes (both incompressible and compressible) sheds light on entropy production in fluid mechanics, with broad implications in applied mechanics.

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“…In this way, the heat cannot uniformly distribute through the baseplate, therefore limiting the convective cooling effect by the fins. Spreading resistance is progressively becoming an important issue in modern microelectronics, and it can be mitigated by either increasing the thickness of the baseplate or by adopting materials with higher thermal conductivity (e.g., novel micro-and nano-structured materials [41]). Here, a perfect thermal contact between case and heat sink baseplate (i.e., negligible thermal contact resistances) is assumed, and R spr is estimated following the work by Lee et al [42], where further details are available.…”

Section: Theoretical Analysismentioning

confidence: 99%

Unshrouded Plate Fin Heat Sinks for Electronics Cooling: Validation of a Comprehensive Thermal Model and Cost Optimization in Semi-Active Configuration

et al. 2016

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Plate Fin Heat Sinks (PFHS) are among the simplest and most widespread devices for electronics cooling. Because of the many design parameters to be considered, developing both cost and thermal effective PFHS is a critical issue. Here, a novel thermal model of PFHS is presented. The model has a broad field of applicability, being comprehensive of the effects of flow bypass, developing boundary layers, fin efficiency and spreading resistance. Experiments are then carried out to validate the proposed thermal model, and its good accuracy is demonstrated. Finally, an optimization methodology based on genetic algorithms is proposed for a cost-effective selection of the design parameters of PFHS, which is particularly effective with semi-active configurations. Such an optimization methodology is then tested on a commercial heat sink, resulting in a possible 53% volume reduction at fixed thermal performances.

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Reconstruction and modeling of 3D percolation networks of carbon fillers in a polymer matrix

Cited by 31 publications

References 26 publications

A review on the heat and mass transfer phenomena in nanofluid coolants with special focus on automotive applications

A review on the heat and mass transfer phenomena in nanofluid coolants with special focus on automotive applications

Overview of the entropy production of incompressible and compressible fluid dynamics

Unshrouded Plate Fin Heat Sinks for Electronics Cooling: Validation of a Comprehensive Thermal Model and Cost Optimization in Semi-Active Configuration

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