Coextrusion Die에서 수축 흐름의 수치모사

유봉렬; Gupta RK; 정인재

Korean Journal of Rheology, Vol.6, No.2, 119-128, December, 1994

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Coextrusion Die에서 수축 흐름의 수치모사

Numerical Simulation of Converging Flow in a Coextrusion Die

유봉렬, Gupta RK, 정인재

초록

공압출되는 sheet die에서 뉴튼 유체의 수축흐름을 격자생성법을 이용한 유한차분법을 사용하여 수치 모사하였다. 계면조건의 처리방법을 개발하였고, 점도 및 채널 모양이 압력강하 및 신장속도에 미치는 영향을 알아 보았다. 압력강하는 점도비의 영향을 크게 받았으며, 신장속도는 점도비 및 채널 모양의 영향을 크게 받았다. 여러 가지 채널 모양에서 신장속도를 비교해 본 결과, 트럼펫 모양의 수축채널이 신장속도가 가장 작게 나타났다.

The flow of Newtonian fluids in a coextrusion sheet die was studied through numerical simulation. Finite difference methods employing grid generation was used. The algorithms treating interface conditions were developed and the effects of viscosity or the profile of channels on the pressure drop and the elongation rate were analyzed. The pressure drop was strongly affected by the viscosity ratio. The elongation rate was strongly affected by the viscosity ratio and the channel profiles. Among the various shaped channels, the conveyging channel of a trumpet type has the least elongation rate.

Keywords:Coextrusion;Converging flow;Elongation rate;Pressure drop;Numerical simulation

[References]

Han CD, "Multiphase Flow in Polymer Processing," Academic Press, New York (1981)
Lee BL, White JL, Trans. Soc. Rheol., 18, 467 (1974)
Han CD, J. Appl. Polym. Sci., 19, 1875 (1975)
Wilson GM, Khomami B, J. Rheol., 37, 314 (1993)
Basu S, Polym. Eng. Sci., 21, 1128 (1981)
Mitsoulis E, J. Rheol., 30, S23 (1986)
Hamel VG, Jahresber. d. Deutschen Math. Ver., 25, 34 (1916)
Christiansen EB, Kelsey SJ, AIChE J., 18, 713 (1973)
Isayev AI, Upadhyay RK, J. Non-Newton. Fluid Mech., 19, 135 (1985)
Bernstein B, Feigl KA, Olsen ET, J. Rheol., 38, 54 (1994)
Tadmor Z, Gogos CG, "Principles of Polymer Processing," John Wiley and Sons, Inc., New York (1979)
Nguyen H, Boger BV, J. Non-Newton. Fluid Mech., 5, 247 (1979)
Tordella JP, Trans. Soc. Rheol., 1, 203 (1957)
Cogswell FN, "Polymer Melt Rheology," John Wiley & Sons, Inc., New York (1981)
Tucker CL, "Fundamentals of Computer Modeling for Polymer Processing," Hanser Publishers, Munich (1989)
Thomson JF, "Numerical Grid Generation," Elsevier Science Publishing Co., Inc., New York (1985)
Roache PJ, "Computational Fluid Dynamics," Hermosa Publishers, Albuquerque (1976)
Middleman S, "Fundamentals of Polymer Processing," McGraw-Hill, New York (1977)

[1] Han CD, "Multiphase Flow in Polymer Processing," Academic Press, New York (1981)

[2] Lee BL, White JL, Trans. Soc. Rheol., 18, 467 (1974)

[3] Han CD, J. Appl. Polym. Sci., 19, 1875 (1975)

[4] Wilson GM, Khomami B, J. Rheol., 37, 314 (1993)

[5] Basu S, Polym. Eng. Sci., 21, 1128 (1981)

[6] Mitsoulis E, J. Rheol., 30, S23 (1986)

[7] Hamel VG, Jahresber. d. Deutschen Math. Ver., 25, 34 (1916)

[8] Christiansen EB, Kelsey SJ, AIChE J., 18, 713 (1973)

[9] Isayev AI, Upadhyay RK, J. Non-Newton. Fluid Mech., 19, 135 (1985)

[10] Bernstein B, Feigl KA, Olsen ET, J. Rheol., 38, 54 (1994)

[11] Tadmor Z, Gogos CG, "Principles of Polymer Processing," John Wiley and Sons, Inc., New York (1979)

[12] Nguyen H, Boger BV, J. Non-Newton. Fluid Mech., 5, 247 (1979)

[13] Tordella JP, Trans. Soc. Rheol., 1, 203 (1957)

[14] Cogswell FN, "Polymer Melt Rheology," John Wiley & Sons, Inc., New York (1981)

[15] Tucker CL, "Fundamentals of Computer Modeling for Polymer Processing," Hanser Publishers, Munich (1989)

[16] Thomson JF, "Numerical Grid Generation," Elsevier Science Publishing Co., Inc., New York (1985)

[17] Roache PJ, "Computational Fluid Dynamics," Hermosa Publishers, Albuquerque (1976)

[18] Middleman S, "Fundamentals of Polymer Processing," McGraw-Hill, New York (1977)