An experimental investigation of interfacial instabilities in multilayer flow of viscoelastic fluids

Wilson, Gregory M.; Khomami, Bamin

doi:10.1016/0377-0257(92)80068-9

Cited by 84 publications

(36 citation statements)

References 19 publications

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“…In addition, very comprehensive experiments have been carried out by Wilson and Khomami on both miscible and immiscible fluids [20,21]. Their facilities introduce temporally regular disturbances with controllable amplitudes and frequencies.…”

Section: Introductionmentioning

confidence: 99%

Role of the interphase in the flow stability of reactive coextruded multilayer polymers

Lamnawar

Maazouz

2009

Polymer Engineering & Sci

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Coextrusion technologies are commonly used to produce multilayered composite sheets or films for a large range of applications from food packaging to optics. The contrast of rheological properties between layers can lead to interfacial instabilities. Important theoretical and experimental advances regarding theses defects have, during the last decades, been made using a mechanical and numerical approach. This study deals with the influence of the physicochemical affinity between the neighboring layers on interfacial instabilities for functionalized incompatible polymers. It was experimentally confirmed, in this case, that weak disturbance can be predicted by considering an interface of nonzero thickness (corresponding to an interdiffusion/reaction zone interphase) instead of a purely geometrical interface between the two reactive layers. According to the rheological investigations, an experimental strategy was here formulated to investigate the parameters that controlled the stability of the reactive multilayer flows. The role of the viscosity ratio, elasticity ratio, and layer ratio of the stability of the interface was also investigated coupling to the reaction rate/compatibilization phenomenon. Hence, based on this analysis, guidelines for a stable coextrusion of reactive functionalized polymers can be provided coupling the classical parameters and the physicochemical affinity at the polymer/polymer interface. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Role of the interphase in the flow stability of reactive coextruded multilayer polymers

Lamnawar

Maazouz

2009

Polymer Engineering & Sci

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“…The intention was to establish if interfacial instability noted during studies with the bifurcated single melt configuration was not merely a result of the normal pressure perturbation from the extruder screw rotation. In this context there have been many studies on the application of linear stability analysis (LSA) to multilayer flows [32][33][34][35][36][37][38][39][40][41][42] which believe that normal process disturbances, such as extruder screw rotation, may initiate interfacial instability. The analysis involves monitoring the response of the interface of a melt system to intentional, controlled and regular perturbations.…”

Section: Dual Extruder Configurationmentioning

confidence: 99%

Imaging and analysis of wave type interfacial instability in the coextrusion of low-density polyethylene melts

Martyn¹,

Spares²,

Coates³

et al. 2009

Journal of Non-Newtonian Fluid Mechanics

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“…For further information on elastic effects in polymer coextrusion (not described in this study), the reader is directed toward Refs. [1,3,13,14,21,23], and [32][33][34][35][36][37]. It is stated in Ref.…”

Section: Introductionmentioning

confidence: 98%

Numerical modeling of multilayer film coextrusion with experimental validation

2014

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An experimental investigation of interfacial instabilities in multilayer flow of viscoelastic fluids

Cited by 84 publications

References 19 publications

Role of the interphase in the flow stability of reactive coextruded multilayer polymers

Role of the interphase in the flow stability of reactive coextruded multilayer polymers

Imaging and analysis of wave type interfacial instability in the coextrusion of low-density polyethylene melts

Numerical modeling of multilayer film coextrusion with experimental validation

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