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References in periodicals archive ?
Flow Instability Properties of the Glass Polypropylene and
The contours represent constant efficiency of power dissipation marked as percent and the shaded areas indicate the regions of flow instability.
This fact is confirmed by experiments (see, e.g., discussion of wake flow instability in [21] and references therein)--periodical structures do not appear in experiments in the weakly nonlinear regime.
The contribution of thermoplastic composites in the general amount of extrusion products made it necessary to gain a better understanding of the influence of filler type and amount incorporated into the polymeric matrix on rheological behavior and the melt flow instability sequence.
The former was the flow instability usually referred to as the cascade defect, which arose from the oscillatory back-and-forth motion of the free surface in the coating nip region 20 On the other hand, the latter stemmed from the imbalance between the surface tension forces and the adverse pressure gradient in the streamwise direction, and is referred to as ribbing instability.
All of these studies have interpreted this phenomenon based on the flow instability without considering the effect(s) of the external factors.
Rossiter [5] derived a semi-empirical equation that predicts the dominant frequency of the cavity flow instability, f, where U is the freestream flow velocity, L is the length of the cavity, M is the Mach number, [c.sub.0] and [c.sub.[tau]] are the speed of sound outside and inside the cavity respectively, [gamma] and [kappa] are empirical terms, and m is the mode of the oscillation.
Surely plug-flow (as the polymer melt slips on the capillary wall) should be involved in the extrusion of the SEBS2 sample, avoiding any flow instability. This wall-slip phenomenon, typical of dense suspensions, is associated with a solid-like response of the polymer melt, derived in this case from the aforementioned blocking effect of PS cylinders.
19716 Two-dimensional simulations of flow instability at the interface of a three-layer, density-matched, viscosity-stratified Poiseuille flow are performed using a front-tracking/finite difference method.
Therefore, the stick-slip effect will be simultaneously generated at two interfaces due to different slip velocities, which will easily result in the flow instability of melt in the circular tube, especially for larger flow rate of melt.
In flat, horizontal cavities heated from below, flow instability due to the Rayleigh-Benard convection may occur at a lower Ra.
Boyd, "Shear Flow Instability at the Interface Between Two Viscous Fluids," J.