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BASIC HEAT TRANSFER AND SOME APPLICATIONS IN …
1 BASIC heat TRANSFER AND SOME APPLICATIONS IN POLYMER PROCESSING (A version of this was published as a book chapter in Plastics Technician s Toolbox, Volume 2, Pages 21-33, SPE 2002) John Vlachopoulos and David Strutt heat TRANSFER is a branch of engineering science which seeks to determine the rate of energy TRANSFER between bodies as a result of temperature differences. The concept of rate is the BASIC difference between heat TRANSFER and thermodynamics. Thermodynamics deals with systems in equilibrium and is concerned with the amount of heat required to change a system from one state to another. Thermodynamics does not answer the question of how fast a change is accomplished.
this chapter: Special Heat Transfer Problems in Plastics Processing. HEAT TRANSFER MODES Temperature differences cause the flow of heat from a high temperature to a low temperature. There are three modes of heat transfer: conduction, convection, and radiation. The basic microscopic mechanism of conduction is the motion of molecules and electrons.
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