In this paper the breakup of droplets under shear in polymer blends is studied by means of linear conservative dichroism and small angle light scattering. More specifically breakup of long fibrils by interfacial instabilities is considered. Measurements are performed on dilute model systems containing nearly Newtonian components in transient flows that involve a sudden increase or decrease in shear rate. The experimental results are used to evaluate the Khakhar and Ottino theory [Khakhar and Ottino (1987)]. In this theory breakup times are calculated starting from the onset of the instability. It is demonstrated that the scaling derived from the Khakhar and Ottino theory also holds for the more readily accessible total breakup time, calculated from the onset of shear flow in a startup flow. The development of interfacial disturbances is studied in a flow history, which consists of generating fibrils by suddenly applying a shear rate followed by a sudden drop in shear rate during which the breakup process is observed. The evolution of the dominant wavelength during this process turns out to be time controlled rather than strain controlled as suggested by the theory.
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November 2000
Research Article|
November 01 2000
Breakup of filaments in blends during simple shear flow
Peter Van Puyvelde;
Peter Van Puyvelde
Department of Chemical Engineering, Katholieke Universiteit Leuven, de Croylaan 46, B-3001 Heverlee, Belgium
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Hong Yang;
Hong Yang
Department of Chemical Engineering, Katholieke Universiteit Leuven, de Croylaan 46, B-3001 Heverlee, Belgium
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Jan Mewis;
Jan Mewis
Department of Chemical Engineering, Katholieke Universiteit Leuven, de Croylaan 46, B-3001 Heverlee, Belgium
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Paula Moldenaers
Paula Moldenaers
Department of Chemical Engineering, Katholieke Universiteit Leuven, de Croylaan 46, B-3001 Heverlee, Belgium
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J. Rheol. 44, 1401–1415 (2000)
Article history
Received:
April 25 2000
Citation
Peter Van Puyvelde, Hong Yang, Jan Mewis, Paula Moldenaers; Breakup of filaments in blends during simple shear flow. J. Rheol. 1 November 2000; 44 (6): 1401–1415. https://doi.org/10.1122/1.1315309
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