scholarly journals Thermal conductivity in porous media: Percolation‐based effective‐medium approximation

2016 ◽  
Vol 52 (1) ◽  
pp. 295-314 ◽  
Author(s):  
Behzad Ghanbarian ◽  
Hugh Daigle
Keyword(s):  
Thermal Conductivity ◽  
Porous Media ◽  
Effective Medium ◽  
Effective Medium Approximation

Effect of Particle Size and Aggregation on Thermal Conductivity of Metal–Polymer Nanocomposite

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Xiangyu Li ◽  
Wonjun Park ◽  
Yong P. Chen ◽  
Xiulin Ruan
Keyword(s):  
Thermal Conductivity ◽  
Effective Medium Theory ◽  
Low Cost ◽  
Polymer Nanocomposite ◽  
Theoretical Models ◽  
Effective Medium ◽  
Metal Nanoparticle ◽  
Effective Medium Approximation ◽  
Local Concentration ◽  
Aggregation Effect

Metal nanoparticle has been a promising option for fillers in thermal interface materials due to its low cost and ease of fabrication. However, nanoparticle aggregation effect is not well understood because of its complexity. Theoretical models, like effective medium approximation model, barely cover aggregation effect. In this work, we have fabricated nickel–epoxy nanocomposites and observed higher thermal conductivity than effective medium theory predicts. Smaller particles are also found to show higher thermal conductivity, contrary to classical models indicate. A two-level effective medium approximation (EMA) model is developed to account for aggregation effect and to explain the size-dependent enhancement of thermal conductivity by introducing local concentration in aggregation structures.

Temperature dependence of thermal conductivity in hybrid nanodispersions

RSC Advances ◽  
2015 ◽  
Vol 5 (4) ◽  
pp. 2768-2776 ◽  
Author(s):  
Arash Behrang ◽  
Miroslav Grmela ◽  
Charles Dubois ◽  
Sylvain Turenne ◽  
Pierre G. Lafleur
Keyword(s):  
Thermal Conductivity ◽  
Temperature Dependence ◽  
Effective Medium ◽  
Effective Medium Approximation

Modified Maxwell homogenization (also called modified effective medium approximation) is used to investigate temperature dependence of hybrid nanodispersions with particles of various shapes and sizes.

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