Numerical analysis of internal flow and mixing performance in polymer extruder I: single screw element

Naksoo Kim; Hongbum Kim; Jaewook Lee

Korea-Australia Rheology Journal, Vol.18, No.3, 143-151, September, 2006

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Numerical analysis of internal flow and mixing performance in polymer extruder I: single screw element

Naksoo Kim^†, Hongbum Kim, and Jaewook Lee¹

Dept. of Mechanical Engineering, Sogang University, 1, Sinsu-dong, Mapo-gu, Seoul 121-742, Korea
¹Dept. of Chemical and Biomolecular Engineering, Sogang University, 1, Sinsu-dong, Mapo-gu, Seoul 121-742, Korea

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We analyzed the non-Newtonian and non-isothermal flow in a single screw extruder system and investigated the mixing performance with respect to the screw speed and the screw pitch. The viscosity of polymer melt was described with Carreau-Yasuda model. The mixing performance was computed numerically by tracking the motions of particles in the screw element system. The extent of mixing was characterized in terms of the deformation rate, the residence time distribution, and the strain. The results revealed that the high screw speed reduces the residence time but increases the deformation rate while the small screw pitch increases the residence time. It is concluded that the high screw speed increases the dispersive mixing performance and the small screw pitch increases the distributive mixing performance.

Keywords:nano-composite;polymer extrusion process;single screw extruder;mixing performance;particle tracking;residence time distribution

[References]

Khalifeh A, Clermont JR, J. Non-Newton. Fluid Mech., 126(1), 7 (2005)
Fenner RT, Polymer, 18, 617 (1977)
Ghoreishy MHR, Nouri MR, J. Appl. Polym. Sci., 74(3), 676 (1999)
Griffith RM, Ind. Eng. Chem. Fundam., 1, 180 (1962)
Karwe MV, Jaluria T, Numerical, 17, 167 (1990)
Kim SJ, Kwon TH, Adv. Polym. Technol., 15(1), 41 (1996)
Kim SJ, Kwon TH, Adv. Polym. Technol., 15(1), 41 (1996)
Kwag DS, Kim WS, Lee KS, Lyu MY, A threedimensional numerical study of fluid flow and heat transfer in the single screw extruder, Proceeding of the second International Conference on Computational Heat and Mass Transfer, 22-26 (2001)
Chiruvella RV, Jaluria Y, Sernas V, Esseghir M, Polym. Eng. Sci., 36(3), 358 (1996)
Sastrohartono T, Jaluria Y, Esseghir M, Sernas V, Int. J. Heat Mass Transf., 38, 1957 (1994)
Syrjala S, Numer. Heat Transf. A-Appl., 35, 25 (1999)
Syrjala S, Numer. Heat Transf. A-Appl., 37, 897 (2000)
Ye YS, Kim HB, Kim N, Lee JW, The Korean Society of Mechanical Engineers, 29, 145 (2005)

[Referenced By]

[Related Articles]

[1] Khalifeh A, Clermont JR, J. Non-Newton. Fluid Mech., 126(1), 7 (2005)

[2] Fenner RT, Polymer, 18, 617 (1977)

[3] Ghoreishy MHR, Nouri MR, J. Appl. Polym. Sci., 74(3), 676 (1999)

[4] Griffith RM, Ind. Eng. Chem. Fundam., 1, 180 (1962)

[5] Karwe MV, Jaluria T, Numerical, 17, 167 (1990)

[6] Kim SJ, Kwon TH, Adv. Polym. Technol., 15(1), 41 (1996)

[7] Kim SJ, Kwon TH, Adv. Polym. Technol., 15(1), 41 (1996)

[8] Kwag DS, Kim WS, Lee KS, Lyu MY, A threedimensional numerical study of fluid flow and heat transfer in the single screw extruder, Proceeding of the second International Conference on Computational Heat and Mass Transfer, 22-26 (2001)

[9] Chiruvella RV, Jaluria Y, Sernas V, Esseghir M, Polym. Eng. Sci., 36(3), 358 (1996)

[10] Sastrohartono T, Jaluria Y, Esseghir M, Sernas V, Int. J. Heat Mass Transf., 38, 1957 (1994)

[11] Syrjala S, Numer. Heat Transf. A-Appl., 35, 25 (1999)

[12] Syrjala S, Numer. Heat Transf. A-Appl., 37, 897 (2000)

[13] Ye YS, Kim HB, Kim N, Lee JW, The Korean Society of Mechanical Engineers, 29, 145 (2005)