Accurate determination of a deformation measure in the screw extrusion process.: An article from: Polymer Engineering and Science
Book Details
Author(s)S.J. Kim, T.H. Kwon
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB00096KX5C
ISBN-13978B00096KX54
MarketplaceFrance 🇫🇷
Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on June 15, 1996. The length of the article is 6893 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: It is important to evaluate the deformation process accurately in analyzing mixing in extrusion. This paper discusses numerical methods to determine a representative deformation measure over the entire cross-section of the extruder channel accurately and efficiently. Two different numerical methods are introduced to determine a deformation measure over the entire cross-section of the extruder channel efficiently: i) the first method based on the mapping sequence of the deformation gradient tensor; and ii) the second method which does not require the evaluation of velocity gradient fields. These two methods are applied to the extrusion process of a single-screw extruder and are compared with respect to their numerical accuracy. It is found that trajectories of fluid particles are difficult to obtain especially near the screw flight and barrel surface, which causes numerical inaccuracies with respect to obtaining a deformation measure. In this paper an inverse mapping method is employed to overcome such a numerical problem. For computational efficiency and accuracy, the second method was found to be more powerful compared with the first one, especially when there are singular points as in an extruder channel.
Citation Details
Title: Accurate determination of a deformation measure in the screw extrusion process.
Author: S.J. Kim
Publication:Polymer Engineering and Science (Refereed)
Date: June 15, 1996
Publisher: Society of Plastics Engineers, Inc.
Volume: v36 Issue: n11 Page: p1454(12)
Distributed by Thomson Gale
From the author: It is important to evaluate the deformation process accurately in analyzing mixing in extrusion. This paper discusses numerical methods to determine a representative deformation measure over the entire cross-section of the extruder channel accurately and efficiently. Two different numerical methods are introduced to determine a deformation measure over the entire cross-section of the extruder channel efficiently: i) the first method based on the mapping sequence of the deformation gradient tensor; and ii) the second method which does not require the evaluation of velocity gradient fields. These two methods are applied to the extrusion process of a single-screw extruder and are compared with respect to their numerical accuracy. It is found that trajectories of fluid particles are difficult to obtain especially near the screw flight and barrel surface, which causes numerical inaccuracies with respect to obtaining a deformation measure. In this paper an inverse mapping method is employed to overcome such a numerical problem. For computational efficiency and accuracy, the second method was found to be more powerful compared with the first one, especially when there are singular points as in an extruder channel.
Citation Details
Title: Accurate determination of a deformation measure in the screw extrusion process.
Author: S.J. Kim
Publication:Polymer Engineering and Science (Refereed)
Date: June 15, 1996
Publisher: Society of Plastics Engineers, Inc.
Volume: v36 Issue: n11 Page: p1454(12)
Distributed by Thomson Gale
More Books by S.J. Kim, T.H. Kwon
