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http://dx.doi.org/10.3795/KSME-A.2006.30.1.032

Numerical Study of Internal Flow in Twin Screw Extruder and Its Mixing Performance Analysis  

Kim, Nak-Soo (서강대학교 기계공학과)
Kim, Hong-Bum (서강대학교 기계공학과)
Lee, Jae-Wook (서강대학교 화학공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.30, no.1, 2006 , pp. 32-41 More about this Journal
Abstract
We analyzed the non-Newtonian and non-isothermal flow in the melt conveying zone in co-rotating and counter-rotating screw extruder system with the commercial code, STAR-CD, and compared the mixing performance with respect to screw speed and rotating direction. The viscosity of fluid was described by power-law model. The dynamics of mixing was studied numerically by tracking the motion of particles in a twin screw extruder system. The extent of mixing was characterized in terms of the residence time distribution and average strain. The results showed that high screw speed decreases the residence time but increases the shear rate. Therefore higher screw speed increases the strain and has better mixing performance. Counter-rotating screw extruder system and co-rotating screw extruder has the similar shear rate with the same screw speed in spite of different rotating direction. However, the counter-rotating screw has good mixing performance, which is resulted from longer residence time than that of co-rotating screw extruder.
Keywords
Co-Rotating Twin Screw Extruder; Counter-Rotating Twin Screw Extruder; Mixing Performance; Particle Tracking; Residence Time Distribution;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Cheng, H. and zloczower, I. M., 1998, 'Distributive Mixing in Conveying Elements of z ZSk-53 Co-rotating Twin Screw Extruder,' Polymer Engineering and Science, Vol.38, No. 6, pp 926-935   DOI   ScienceOn
2 Linjie, Z., Kwabena, A. N. and Kun, S. H., 2005, 'Investigation of Mixing Mechanisms and Energy Balance in Reactive Extrusion Using Three-Dimensional Numerical Simulation Method,' International Journal of Heat and Mass Transfer, Vol. 48, pp 3411-3422   DOI   ScienceOn
3 Bakalis, S. and Karwe, M. V., 2002, 'Velocity Distributions and Volume Flow Rates in the Nip and Translational Regions of a Co-Rotating, Self-Wiping, Twin-Screw Extruder,' Journal of Food Engineering, Vol. 51, pp 273-282   DOI   ScienceOn
4 Bravo, V. L., Hrymak, A. N. and Wricht, J. D., 2004, 'Study of Particel Trahectories Residence Times and Flow Behavior in Kneading Discs of Intermeching Co-Rotating Twin-Screw Extruders,' Polymer Engineering and Science, Vol. 44. No. 4, pp 779-793   DOI   ScienceOn
5 YE, Y. S., Kim, H.B., Kim, N. S. and Lee, J. W., 2005, 'A Study on Analysis of Polymer Extruder Process using Finite Element Method,' KSMTE, Vol. 29, No. 1, pp 145-155   과학기술학회마을   DOI
6 Shearer, G. and Tzoganakis, C., 2000, 'The Effects of Kneading Block Design and Operating Conditions of Distributive Mixing in Twin Screw Extruders,' Polymer Engineering and Science, Vol.40, No. 5, pp 1095-1106   DOI   ScienceOn
7 Bravo, V. L. and Hrymark, A. N., 2000, 'Numerical Simulation of Pressure and Velocity Profiles in Kneading Elements of a Co-Rotating Twin Screw Extruder,' Polymer Engineering and Science, Vol.40, No. 2, pp 525-541   DOI   ScienceOn
8 Ishikawa, T. and Amano, T., 2002, 'Flow Pattern and Mixing Mechanisms in the Screw Mixing Element of a Co-Rotating Twin-Screw Extruder,' Polymer Engineering and Science, Vol.42, No. 5, pp 925-939   DOI   ScienceOn
9 Ishikawa, T., Kihara, S. I. and Funatsu, K., 2000, '3-D Numerical Simulations of Nonisothermal Flow in Co-Rotating Twin Screw Extruders,' Polymer Engineering and Science, Vol. 40, No. 2, 357-364   DOI
10 Yoshinaga, M., Katsuki, S., Miyazaki, M., Liu, L., Kihara, S. I. and Funatsu, K., 2000, 'Mixing Mechanism of Three-Tip Kneading Block in Twin Screw Extruders,' Polymer Engineering and Science, Vol.40, No. 1, pp 168-178   DOI   ScienceOn
11 Jaluria, Y., Karwe, M. V. and Sernas, V., 1996, 'Transport in a Twin-Screw Extruder for the Processing of Polymers,' Polymer Engineerings and Science, Vol.36, No. 11, pp 1531-1540   DOI   ScienceOn
12 Ghoreishy, M. H. R. and Razavi Nouri, M., 1999, 'Finite Element Analysis of Thermoplastic Melt Flow through the Metering and Die Region of Single Screw Extruders,' Journal of Applied Polymer Science, Vol 74, pp 676-689   DOI   ScienceOn
13 Kajiwara, T., Nagashima, Y., Nakano, Y. and Funatsu, K., 1996, 'Numerical Study of Twin-Screw Extruder by Three-Dimesnional Flow Analysis-Development of Analysis Technique and Evaluation of Mixing Performance for Full flight Screws,' Polymer Engineering and Science, Vol. 36, No. 16, pp 2142-2152   DOI   ScienceOn