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Computer Simulation of Viscoelastic Flow in a Capillary Die for Rubber Compounds  

Park, Dong-Myung (Hankook Tire R&D Center)
Kim, Hok-Joo (Hankook Tire R&D Center)
Yoon, Jae-Ryong (Hankook Tire R&D Center)
Lyu, Min-Young (Department of Die and Mould Design, Seoul National University of Technology)
Publication Information
Elastomers and Composites / v.41, no.4, 2006 , pp. 223-230 More about this Journal
Abstract
Rubber compounds have a high viscoelastic property. One of the viscoelastic behaviors during profile extrusion is the swelling of extrudate, and the amount of swelling varies with operational conditions in extrusion. It is well recognized that the elastic portion in the viscoelastic property plays an important role in the extrudate swell. In this study computer simulation of the die swell at the capillary die for several rubber compounds has been performed using commercial CFD code, Polyflow. A non-linear differential viscoelastic model, Phan-Thien-Tanner (PTT) model, was used in the computer simulation. Non-isothermal behavior was considered in the calculation. Distribution of pressure, velocity and temperature in the reservoir and capillary die, and extrudate profiles were predicted through the simulation. The amount of the die swell fur the different rubber compounds was investigated for various flow rates and three types of length to diameter of the capillary die. It is concluded that the PTT model successfully represented viscoelastic behavior of rubber compounds.
Keywords
Rubber compounds; Viscoelastic behavior; Extrudate swell; Phan-Thien-Tanner Model; Capillary Die;
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