Finite size gap effects on the modeling of thermal contact conductance at polymer-mold wall interface in injection molding

Document Type

Article

Publication Date

1-1-2000

Abstract

Heat transfer in polymer processing by injection molding is affected by the thermal contact conductance at the interface between the polymer and the metal mold. The modeling of thermal contact conductance at such interfaces is simplified by the assumption of an isothermal condition at the two contacting surfaces. In this study we examine the validity of such an assumption for the case of an interface involving plastic (a low thermal conductivity material) and metal (a high thermal conductivity material). The study shows that at such an interface between materials of widely varying thermal conductivity, the conditions at the interface depart from the isothermal assumption, with the heat flux becoming more uniform and the temperature difference varying by a larger magnitude across the contact plane. This effect is more pronounced as the width of the gaps increases for the same area of contact. This suggests that the modeling of the contact conductance should be based on average temperatures for the contacting surfaces.

Identifier

0033892333 (Scopus)

Publication Title

Journal of Applied Polymer Science

External Full Text Location

https://doi.org/10.1002/(SICI)1097-4628(20000401)75:14<1776::AID-APP12>3.0.CO;2-G

ISSN

00218995

First Page

1776

Last Page

1782

Issue

14

Volume

75

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