Experimental observation on entrance flow inside extrusion dies.: An article from: Polymer Engineering and Science

This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on November 15, 1996. The length of the article is 3568 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: A flow visualization technique was employed to observe the flow fields at the entrance region inside extrusion dies. Four types of solutions, i.e., Newtonian, shear-thinning, Boger, and viscoelastic fluids, were used as test fluids. Entrance flows inside center-fed and end-fed dies of different configurations were examined. It was found that, even though the swirling motions appear in the entrance region of center-fed dies, no vortex develops. Shear-thinning behavior tends to enhance swirling, but fluid elasticity suppresses the swirling. On the other hand, vortices exist at certain end-fed die geometries, and vortices will grow if the fluid exhibits shear-thinning, yet fluid elasticity reduces the size of vortices. Several inlet designs effective for eliminating vortices were studied.

Citation Details
Title: Experimental observation on entrance flow inside extrusion dies.
Author: Yun-Han Chang
Publication:Polymer Engineering and Science (Refereed)
Date: November 15, 1996
Publisher: Society of Plastics Engineers, Inc.
Volume: v36 Issue: n21 Page: p2663(13)

Distributed by Thomson Gale