Investigation of the Free‐Surface Flow in Partially Filled Extruders

Abstract

In this work we present the free-surface flow of high viscous Newtonian liquids in a simplified extruder model, namely the flat-plate model. Due to high density and viscosity ratios, a free-surface approach based on the volume of fluid method is used. The material distribution for different degree of fillings and the resulting power consumption is investigated. In addition, the obtained power characteristic is compared against analytical consideration and numerical simulation of a fully filled case. The investigation shows that the power characteristic of a partially filled extruder can be estimated by a fully filled computation.

Numerical Investigation of the Free‐Surface Flow within an Annulus

“…In [1,2] steady-state solutions in partially filled geometries are obtained showing the influence of variable filling degree on integrated quantaties such as the power consumption and the volumetric flux in extruder devices. For these calculations a finite volume implementation of the volume of fluid method proposed by [3] is applied.…”