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  • 1
    Electronic Resource
    Electronic Resource
    Anisotropic conduction of heat caused by molecular orientation in a flowing polymeric liquid (1990)
    Springer
    Rheologica acta 29 (1990), S. 175-181 
    Details
    ISSN: 1435-1528
    Keywords: Anisotropy ; thermalconductivity ; orientation ; Graetz-Nusselt problem ; polymer processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract To demonstrate the influence of molecular orientation on the heat conduction in a flowing polymeric liquid, we consider a variant of the Graetz-Nusselt problem. A polymeric liquid is flowing between two flat, parallel plates with a sudden change in the wall temperature. The temperature distribution in the entrance region is calculated numerically taking viscous dissipation into account. It is assumed that the material properties are independent of the temperature. It is shown that the change in the temperature distribution in the fluid caused by molecular orientation is large enough to affect polymer processing significantly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01331353
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The non-isothermal elastic dumbbell: A model for the thermal conductivity of a polymer solution (1990)
    Springer
    Rheologica acta 29 (1990), S. 416-422 
    Details
    ISSN: 1435-1528
    Keywords: Thermal conductivity ; anisotropy ; elastic dumbbell ; polymer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract In a flowing polymeric liquid, molecular orientation will give rise to anisotropic conduction of heat. In this paper, a theory is presented relating the thermal conductivity tensor to the deformation history of the fluid. The basis of this theory is formed by the Hookean dumbbell. It is shown that the anisotropy of the thermal conductivity is proportional to the polymer contribution to the extra-stress tensor. This stress-thermal law makes it relatively simple to incorporate anisotropic heat conduction into the numerical simulation of a flowing polymeric liquid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01376792
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A network theory for the thermal conductivity of an amorphous polymeric material (1989)
    Springer
    Rheologica acta 28 (1989), S. 257-266 
    Details
    ISSN: 1435-1528
    Keywords: Thermalconductivity ; anisotropy ; network theory ; polymer ; rubber
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract A model to relate the thermal conductivity tensor to the deformation of an amorphous polymeric material above the glass transition temperature is presented. The basis of the model is formed by the transient network theory for polymer melts. With this theory it is possible to calculate the average orientation of the macromolecular segments as a function of the history of the deformation. Combined with an expression which relates the thermal conductivity to the orientation of the molecules, this provides us with the information needed to calculate the heat conduction tensor. Despite the fact that the simplest possible network model is chosen, there is good agreement with the sparse, experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01329335
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Anisotropic conduction of heat in a flowing polymeric material (1990)
    Springer
    Rheologica acta 29 (1990), S. 580-587 
    Details
    ISSN: 1435-1528
    Keywords: Anisotropy ; thermalconductivity ; polymerprocessing ; orientation ; viscousheating
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract In this paper a theory is presented which relates the thermal conductivity tensor of an amorphous polymeric material to the history of deformation of the material. The basis of the theory is formed by the network theory for polymeric materials. It will be shown that the results obtained here are in good agreement with experimental results on rubber. The effect of anisotropic heat conduction on the flow of a polymeric material will be demonstrated by the simple example of viscous heating in shear flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01329304
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    Paper (German National Licenses)
    Fulltext
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