Numerical simulation of blown-film process of plastics provides a tool for air ring designs and suitable polymer properties. Although cooling-air plays a key role in the process ability and film properties, there have been few research works taking correct account of the cooling-air effect. Numerical analyses of heat transfer from the surface of molten polymer to cooling-air were conducted using precise turbulence models and then simulations of bubble shape of blown-film process were performed under the air pressure and the thermal boundary conditions estimated from the numerical analyses of cooling-air. The film bubble shape predicted has coincided well with experimental data and it is confirmed that the bubble stability is strongly dominated by characteristics of cooling-air flow and heat transfer near the bubble surface.
From O. Akaike | T. Tsuji | Y. Nagano
Department of Mechanical Engineering, Nagoya Institute of Technology, Nagoya, JAPAN
Appeared in International Polymer Processing 1999/02, Page 168-174
Direct link: http://www.polymer-process.com/IPP1540
Simulation of Blown-Film Process Taking Account of Cooling-air Effect [181 KB]
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