Dynamical Systems Analysis of Pin-Mixer Flows in Single-Screw Extruder: Experimental Flow Visualization
Tai Hun Kwon, K.W. Kang, W.R. Hwang
Pohang University of Science and Technology
Korea

Keywords: Dynamical Systems and Chaos, Pin Mixer, Single-Screw Extruder

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Mixing patterns of a passive dye were investigated experimentally in the unwound screw channel flow equipped with various pin types and were interpreted in terms of the dynamical systems theory in comparison with numerically predicted dynamical structure. Experimental observations include: (i) distinction of two different regions separated by KAM torus, (ii) the effect of number of pins in a row on the dynamics inside inner zone, (iii) the effect of height of pin on the size of inner region, (iv) and the effect of composition of the two different pin units. In the presentation, we will first review the dynamical systems structures predicted by numerical simulations. Then, we will present continuous three-dimensional mixing patterns (both longitudinal and cross sectional), interpreting them with numerical results and the dynamical systems theory.