Heat Transfer in Polymer Systems

The transfer of heat is an important aspect of every polymer processing operation. In fact, without heat transfer, the shaping and forming of polymers would not be possible. 

Although considerable progress has been made in understanding heat transfer in polymeric systems, much still remains to be done. There are a number of reasons why this is so, including lack of good physical data such as (thermal conductivities, specific heats, and rheological behavior), and failure to cope with such complexities of polymer behavior as elastic effects, compressibility, and viscous dissipation. 

The present effort will be directed to providing a fundamental and useful treatment of heat transfer in polymeric systems with the goals of affording both understanding and practical techniques. 

For a cylindrical coordinate system (as shown in Fig. 4-1), the equation of energy is  

= velocity components in the r 0, and z coordinates Trzf te = shear stresses 

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