Thermal conductivity polymers

Initial width of fluid channel Final width of fluid channel Height of fluid channel Metal plate thickness Metal thickness at the edges Channel length Volumetric polymer flowrate Polymer inlet temperature Temperature of Dowtherm Polymer density Polymer heat capacity Polymer thermal conductivity Metal thermal conductivity... 

The increase in the polymer thermal conductivity is far from the predicted values resulting from a mixing law and actual data are low, for example ... 

The thermal characteristics of NR-metal composites are close to the properties of metals, whereas the mechanical properties and the processing methods are typical of polymers.Thermally conducting, but electrically insulating, polymer-matrix composites are increasingly important for electronic packaging because the heat dissipation ability limits the reliability, performance and miniaturization of electronics.Thermal properties such as thermal conductivity, thermal dilfusivity and specific heat of metal (copper, zinc, Fe and bronze) powder-filled polymer composites are investigated experimentally in the range of filler content 0-24% by volume. ... 

Class Polymer Thermal Conductivity (ASTM C177) Btu/(hr ffF)... 

Table 4. Polymer Thermal Conductivity, Density, at Room Temperature...

Anderson [2] and Knappe [3] have summarized most of the available polymer thermal conductivity data. Where possible, of course, experimental data should be used. In many instances, however, such data are not available. It therefore becomes necessary to use correlations for estimating the needed information. 

Fig. 4-2 Generalized curve for amorphous polymer thermal conductivities [4].

Fig. 4-3 Amorphous polymer thermal conductivities vs refractive index [5].

Molten polymer thermal conductivities represent a somewhat different case than that of the solid phase. In essence, the thermal conductivities of the melt vary little with temperature. Consequently, an acceptable value of k can be estimated from the relation... 

Fig. 4-5 Correlation polymer thermal conductivity with temperature and crystallinity [4].

In amorphous polymers thermal conductivity increases slowly in the glassy region, is constant or slowly decreasing in the rubbery region, again slowly increases in the melt flow region, and undergoes a more-or-less abrupt decrease in... 

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