Abstract
A laboratory spiral-disk extruder for the study of gas entrainment phenomena is presented. The rotating plate is transparent, thus allowing for the direct observation of the steady liquid-gas interface when operating under starve-fed conditions. The extruder flow is modeled with the conventional single screw extruder approach. This leads to a simple working equation for the spiral screw, which is formally identical to the classical screw equation for standard extruders. The model is validated by comparing the predictions with experimental data taken in both closed and open die configurations.
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