Experimental Investigation and Numerical Modelling of Flow Characteristics of Non-Rotating Twin Screw Model

Abstract

Twin-screw pumps employ clearances between both screws and screw rotors and housing, which cause backflow as function of pressure differential. Reduction of this flow can be reached by proper geometry design. For the experimental investigation, the scaled model 1:2 of the screws section was produced with trapezoidal tooth profile in two modifications differing in tooth width and pitch. Measurement of flow characteristics of non-rotating twin-screw model was carried out for validation and possible corrections of the 3D CFD model. The testing was done with non-Newtonian liquid met in the food industry and additionally also with water. Experimental data were partly compared with results obtained from numerical simulations.

Methods of CFD Modelling of Twin-Screw Pumps for Non-Newtonian Materials

“…Highly viscous materials, i.e. non-Newtonian fluids, are transported by means of screw pumps [Lapcik, 2020], for which it is necessary to define the corresponding functional dependence of viscosity. In this case, it is a power law definition of viscosity:…”

“…The density of 1000 kgm -3 was used for both matters. More information you can find in [Drabkova 2020].…”