Study on the growth of vapor bubble in devolatilization of polymers

Chongyoup Kim

Korea-Australia Rheology Journal, Vol.11, No.3, 247-253, September, 1999

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Study on the growth of vapor bubble in devolatilization of polymers

Chongyoup Kim^†

Department of Polymer Engineering, Chungnam National University, 220 Goong-dong, Yoosong-goo Taejeon 305-764, Korea

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The growth of a spherical vapor bubble contained in a large body of upper convected Maxwell fluid is theoretically analyzed under the devolatilization condition of polymer by using a Galerkin FEM in the Lagrangian frame. Using the finite element technique, a fully explicit numerical scheme is developed both for the calculation of pressure distribution and for the tracking of bubble surface. Oscillatory behavior in bubble radius is observed during growth and the oscillatory behavior is found to be due to the interaction of mass transfer resistance and elasticity. It is found that the elasticity of fluid accelerates the growth and removal of volatile component. It is also found that the bubble growth in the devolatilization of polymers is affected by both mass transfer resistance and viscoelasticity of fluids.

Keywords:Lagrangian frame;Elasticity;Rebound;Diffusion

[References]

Afremanesh A, Advani SG, Rheol. Acta, 30, 274 (1991)
Albalak RJ, Polymer Devolatilization, Marcel Dekker, New York (1996)
Biesenberger JA, Devolatilization of Polymers, Hanser, Munich (1983)
Biesenberger JA, Sebastian DH, Princiles of Polymer Reaction Engineering, Wiley, New York (1983)
Doi M, Edwards SF, The Theory of Polymer Dynamics, Clarendon Press, Oxford (1986)
Duda JL, Vrentas JS, Ju ST, Liu HT, AIChE J., 28, 279 (1982)
Favelukis M, Albalak RJ, Chem. Eng. J., 63, 149 (1996)
Han CD, Yoo HJ, Polym. Eng. Sci., 21, 518 (1981)
Kim C, J. Non-Newton. Fluid Mech., 55(1), 37 (1994)
Mendelson RA, J. Rheol., 23, 545 (1979)
Mendelson RA, J. Rheol., 24, 765 (1980)
Papanastasiou AC, Scriven LE, Macosko CW, J. Non-Newton. Fluid Mech., 16, 53 (1984)
Scriven LE, Chem. Eng. Sci., 10, 1 (1959)
Venerus DC, Yala N, Bernstein B, J. Non-Newton. Fluid Mech., 75(1), 55 (1998)
Vrentas ST, Duda JL, J. Polym. Sci. B: Polym. Phys., 15, 403 (1977)
Zana E, Leal LG, Ind. Eng. Chem. Fundam., 10, 54 (1975)

[Related Articles]

[1] Afremanesh A, Advani SG, Rheol. Acta, 30, 274 (1991)

[2] Albalak RJ, Polymer Devolatilization, Marcel Dekker, New York (1996)

[3] Biesenberger JA, Devolatilization of Polymers, Hanser, Munich (1983)

[4] Biesenberger JA, Sebastian DH, Princiles of Polymer Reaction Engineering, Wiley, New York (1983)

[5] Doi M, Edwards SF, The Theory of Polymer Dynamics, Clarendon Press, Oxford (1986)

[6] Duda JL, Vrentas JS, Ju ST, Liu HT, AIChE J., 28, 279 (1982)

[7] Favelukis M, Albalak RJ, Chem. Eng. J., 63, 149 (1996)

[8] Han CD, Yoo HJ, Polym. Eng. Sci., 21, 518 (1981)

[9] Kim C, J. Non-Newton. Fluid Mech., 55(1), 37 (1994)

[10] Mendelson RA, J. Rheol., 23, 545 (1979)

[11] Mendelson RA, J. Rheol., 24, 765 (1980)

[12] Papanastasiou AC, Scriven LE, Macosko CW, J. Non-Newton. Fluid Mech., 16, 53 (1984)

[13] Scriven LE, Chem. Eng. Sci., 10, 1 (1959)

[14] Venerus DC, Yala N, Bernstein B, J. Non-Newton. Fluid Mech., 75(1), 55 (1998)

[15] Vrentas ST, Duda JL, J. Polym. Sci. B: Polym. Phys., 15, 403 (1977)

[16] Zana E, Leal LG, Ind. Eng. Chem. Fundam., 10, 54 (1975)