Home >> Resources/Information >> Extrusion, Mixing
Chaotic Transports in Single Screw Extrusion Process
Chaotic Transports in Single Screw Extrusion Process
Present researchers :
Wookryol Hwang : Ph.D 2001
Former researchers :
Seejo Kim : Ph.D 1995, Professor at Andong Nat'l Univ.
Taehee Lee : MS 1996, Researcher at LG Electronics
Hansoo Jeon : MS 2000, Researcher at LG Cable
Mixing enhancement plays very important roles in single-screw extrusion process, since it's lack of mixing performance compared with that of twin-screw extruder impedes the widespread applications regardless of their superiority in power consumptions, expeditures, maintences, etc. Our laboratory invented genius mixing device called Chaos Screw (CS) which induces chaos so that the mixing performance increases drastically. Now CS is considered as the first practical application of chaotic mixing in the single-screw extrusion process (Rauwendaal, C., Polymer mixing, Hanser Publishers, Munich 1998).
We carried theoretical and numerical approaches to investigate the following objectives.
* Rigorous dynamical modeling
* Numerical verifications of dynamical or chaotic structures
* Dynamics near homoclinic tangle
* Dynamics inside nonlinear rotations
* Bifurcation analysis of subharmonic orbits and invariant sets
* Comparison between numerical and experimental results by the experimental visualization of flow in CS
Related Publications - International Journal
* S.J. Kim & T.H. Kown
Advances in Polymer Technology, Vol.15, pp.41-54, 1996. pdf
* S.J. Kim & T.H. Kown
Advances in Polymer Technology, Vol.15, pp.55-69, 1996. pdf
* T.H. Lee & T.H. Kown
Advances in Polymer Technology, Vol.18, pp.53-68, 1999. pdf
* W.R. Hwang & T.H. Kown
Journal of Japan Society of Polymer Processing, Vol.10, No.9, 1998. pdf
* W.R. Hwang and T.H. Kwon
"Dynamical Modeling of Chaos Single Screw Extruder and Its Three-Dimensional Numerical Analysis", Polymer Engineering & Science, 40, pp.702-714, 2000. pdf
* W.R. Hwang, H.S. Jun and T.H. Kwon
"Chaotic Mixing in a Screw Channel Flow", AIChE Journal, Accepted. pdf
Related Publications - International Conferences
* W.R.Hwang and T.H.Kwon
"Three-Dimensional Flow Visualization of Chaotic Mixing Via a Simulator of a Chaotic Single-Screw Extruder", PRCR2(2nd Pacific Rim Conference on Rheology), The Australian Society of Rheology, Melbourne, Australia, July 27-31, 1997, (pp.111-112 on Abstract).
* W.R.Hwang and T.H.Kwon
"Mixing Enhancement of Single-Screw Extrusion Process via Chaotic Flows", The 14th Annual Meeting of Polymer Processing Society (PPS14), Yokohama, Japan, June 8-12, 1998 (Invited lecture), (pp.17-20 on Extended Abstract).
* W.R.Hwang and T.H.Kwon
"Mixing Enhancement of Sinlge-Screw Extrusion Process via Chaotic Flows", International Symposium on Advanced Machinery and Design, Seoul, November 3-4, 1998 (Invited Lecture), (pp.90-106 on Proceedings of International Symposium on Advanced Macinery and Design, Institue of Advanced Machinery and Design, Seoul National University).
* W.R.Hwang and T.H.Kwon
"Dynamic Modelling of Chaos Screw", The 15th Annual Meeting of Polymer Processing Society (PPS15), 's-Hertogenbosch, The Netherlands, May 31-June 4, 1999, (Technical Papers on CD-ROM).
* W.R. Hwang and T.H. Kwon
"Mixing Measures for Chaos Screw According to Dynamics and Transport Phenomena", The 16th Annual Meeting of Polymer Processing Society (PPS16), Vol 1(of 2), pp.58-59, Shanghai, China, June 18-23, 2000.
* W.R. Hwang and T.H. Kwon
"Chaotic Advections in Single-Screw Extrusion Process: a 3-D Volume-Preserving Open Flow System", 53rd Annual Meeting of Americal Physical Society's Division of Fluid Dynamics (APS DFD00), Bulletin of The American Physical Society, 45 (9), pp.90, Washington D.C., USA, November 19-21, 2000.
* W.R. Hwang, H.S. Jun and T.H. Kwon
"Chaotic Mixing in a Single-Screw Extrusion Process: Experimental Flow Visualization & Numerical Study", The 17th Annual Meeting of Polymer Processing Society (PPS17), Montreal, Cananda, May 21-24, 2001 (Paper ID:077).
Immiscible Mixing of Polymer Blends
Present researchers :
Nobody
Former researchers :
Taehee Lee : MS 1996, Researcher at LG Electronics
Hansoo Jeon : MS 2000, Researcher at LG Cable
The dispersive mixing of liquid-liquid systems occurs when the liquids are not miscible. This is an important operation in the polymer industry because the majority of the polymers blended together are immiscible or at best partially miscible. As a result, a microstructure of separate phases will result from the melt blending process. This microstructure will be determined by the pertinent properties of the ingradients and the interaction properties, the mixer conditions, and the mixer geometry, so our laboratory is doing immiscible mixing experiment by using a chaotic simulator which is invented by our laboratory. (Rauwendaal, C., Polymer mixing, Hanser Publishers, Muncich 1998)
We carried theoretical and numerical approaches to investigate the following objectives.
* Experimental observation of drop breakup and deformation in chaotic flows
* 3-Dimensional Simulation of drop breakup in chaotic flows
* Comparison between numerical and experimental results
Related Publications - International Journal
* None
Related Publications - International Conferences
* H.S. Jun, W.R. Hwang and T.H. Kwon
"Characteristic Drop Deformation and Breakup of an Immiscible Drop in Single-Screw Extrusion Process", The 17th Annual Meeting of Polymer Processing Society (PPS17), Montreal, Cananda, May 21-24, 2001 (Paper ID:219).
