Steady and transient flow of a non-Newtonian chemically reactive fluid in a twin-screw extruder.: An article from: Polymer Engineering and Science
Book Details
Author(s)W. Zhu, Y. Jaluria
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB0008FVNH6
ISBN-13978B0008FVNH8
MarketplaceFrance 🇫🇷
Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on November 1, 2002. The length of the article is 7393 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: The flow of chemically reactive non-Newtonian materials, such as bio-polymers and acrylates, in a fully intermeshing, co-rotating twin-screw extruder is numerically investigated. A detailed study of the system transient behavior is carried out. The main transient aspects, including response time, variation of system variables, and instability of operation, are studied for both single- and twin-screw extruders, since single-screw extruder modeling closely approximates the region away from the intermeshing zone in a twin-screw extruder. The effect of a time-dependent variation in the boundary conditions is studied. The coupling due to conduction heat transfer in the screw barrel is found to be very important and is taken into account for single-screw extruders. In the absence of this conjugate coupling, the response time is much shorter. Several other interesting trends are obtained with respect to the dependence of the transient response on the materials and operating conditions. Steady state results are obtai ned at large time. The calculated velocity distributions in the screw channel are compared with experimental results in the literature for steady state flow and good agreement has been obtained. The calculated results for transient transport agree with the few experimental observations available on this system. Chemical reaction, leading to chemical conversion of the material, is also considered and the resulting effects on the flow and transport determined. These results will be useful in the design, control and optimization of polymer extrusion processes.
Citation Details
Title: Steady and transient flow of a non-Newtonian chemically reactive fluid in a twin-screw extruder.
Author: W. Zhu
Publication:Polymer Engineering and Science (Refereed)
Date: November 1, 2002
Publisher: Society of Plastics Engineers, Inc.
Volume: 42 Issue: 11 Page: 2120(17)
Distributed by Thomson Gale
From the author: The flow of chemically reactive non-Newtonian materials, such as bio-polymers and acrylates, in a fully intermeshing, co-rotating twin-screw extruder is numerically investigated. A detailed study of the system transient behavior is carried out. The main transient aspects, including response time, variation of system variables, and instability of operation, are studied for both single- and twin-screw extruders, since single-screw extruder modeling closely approximates the region away from the intermeshing zone in a twin-screw extruder. The effect of a time-dependent variation in the boundary conditions is studied. The coupling due to conduction heat transfer in the screw barrel is found to be very important and is taken into account for single-screw extruders. In the absence of this conjugate coupling, the response time is much shorter. Several other interesting trends are obtained with respect to the dependence of the transient response on the materials and operating conditions. Steady state results are obtai ned at large time. The calculated velocity distributions in the screw channel are compared with experimental results in the literature for steady state flow and good agreement has been obtained. The calculated results for transient transport agree with the few experimental observations available on this system. Chemical reaction, leading to chemical conversion of the material, is also considered and the resulting effects on the flow and transport determined. These results will be useful in the design, control and optimization of polymer extrusion processes.
Citation Details
Title: Steady and transient flow of a non-Newtonian chemically reactive fluid in a twin-screw extruder.
Author: W. Zhu
Publication:Polymer Engineering and Science (Refereed)
Date: November 1, 2002
Publisher: Society of Plastics Engineers, Inc.
Volume: 42 Issue: 11 Page: 2120(17)
Distributed by Thomson Gale
