Anisotropic thermal conductivity

Heat Conductivity Their outstanding anisotropic thermal conductivity allows them to be used when heat must be moved from one location to another. 

As indicated above, much interest exists in dynamic behavior of thin aligned layers of nematic liquid crystals. It is not surprising to find, therefore, that measurement of the anisotropy of transport properties has been the objective of many studies of thermotropic systems. The literature on anisotropic thermal conductivity in nematic liquid crystals has been reviewed recently by Rajan and Picot (12). Among the studies of anisotropic diffusion are those of Yun and Fredrickson (13), Bline... 

The thermal conductivity of a Si3N4 composite is controlled by the level of porosity, the P-phase content, the amount and conductivity of the reinforcement phase (Si3N4 vs. SiC), the amount of glassy phase and any orientation effect. In Si3N4-Si3N4(w), the thermal conductivity will increase with the density and with the amount of P-phase, as it possesses a higher thermal conductivity than a-phase. In addition, orientation of the whiskers produces an anisotropic thermal conductivity behaviour, where a higher thermal conductivity, up to... 

In separation processes and chemical reactors, flow through cylindrical ducts filled with granular materials is important. In such systems conduction, convection, and radiation all contribute to the heat flow, and thermal conduction in axial ke x and radial ke r directions may be quite different, leading to highly anisotropic thermal conductivity. For a bed of uniform spheres, the axial and radial elements are approximated by... 

Drach V, Wiener M, Reichenauer G, Ebert H.-P, Fricke J (2007) Determination of the Anisotropic Thermal Conductivity of a Carbon Aerogel-Fiber Composite by a Non-contact Thermographic Technique. Internal... 

Three-dimensional tensor of the thermal conductivity Tensor which, when multiplied by the temperature gradient vector according to the rules of matrix multiplication, gives the heat flux density vector, i.e., heat flux density and temperature gradient must not have the same orientation, which is the case in media with an anisotropic thermal conductivity Thiolate An organic molecule terminated with an functionality. An example is 4-fluorophenylthiolate, FCsIUS ... 

Thermal conductivity is an important parameter used for material thermal calculations in the injection molding simulation. A variation in the thermal conductivity will alter the cooling rate and hence cause a variation in the temperature this in turn will cause the viscosity, pressure, and frozen layer to vary. Classical Fourier theory, which assumes thermal conductivity to be a constant scalar value depending only on temperature alone, is inadequate to describe the heat conduction in deformed molten polymer. Van den Brule (1989, 1990) and van den Brule and O Brien (1990) suggested that heat transport mechanisms along the backbone of a polymer chain are more efficient than those between neighboring chains. Hence, the orientation of polymer chain segments induced by flow leads to an anisotropic thermal conductivity. To describe anisotropic thermal conduction, one... 

Dai SC (2006) Tanner RI Anisotropic thermal conductivity in sheared polypropylene. Rheol Acta 45 228-238... 

Zheng R, Kennedy PK (2006) Anisotropic thermal conduction in injection molding. Proc. 22nd Annual Conf Polym Process Soc, Yamagata... 

Kawabata S, Measurement of anisotropic thermal conductivity of single fibre , J. Textile Machin. Soc., Jpn, 1986, 39(12), 184. 

FIGURE 2.13 Filler orientation model to describe anisotropic thermal conductivity in injection-molded test specimens [77]... 

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