Characteristic Curves based on 3D Non-isothermal Flow Computations in Single-screw Extruder for Non-Newtonian Fluids

Abstract

This paper presents numerical applications of a finite-volume method to steady three-dimensional non-isothermal inertial flows in geometries related to a single-screw extruder, with the purpose to provide characteristic curves related to rheological parameters, geometrical and operating conditions. We consider incompressible fluids obeying Newtonian, non-Newtonian Carreau-Yasuda equations with different shear-thinning properties. The temperature dependence is described by a Williams-Landel-Ferry (WLF) equation. For discretizing the equations and unknowns, we use a staggered grid and solve the set of governing equations by a decoupled algorithm. The numerical results are presented in different gap conditions and allow us to state the rheological parameters, the screw parameters and the rotational velocity on the flow characteristics in a screw-barrel system.

Outlier and Normality Testing of the Residuals from the Carreau-Yasuda Model in Fitting the Rheological Behavior of the Non-Newtonian fluid TF2N

“…Shear thinning is the most common type of non-Newtonian behavior of fluids and is seen in many industrial and everyday applications. Although shear thinning is generally not observed in pure liquids with low molecular mass or ideal solutions of small molecules like sucrose or sodium chloride, it is often observed in polymer solutions and molten polymers, as well as complex fluids and suspensions like ketchup, whipped cream, blood, paint, and nail polish [3,[34][35][36][37][38][39].…”

Non-Isothermal Simulation and Safety Analysis of Twin-Screw Extrusion Process for Synthetizing Glycidyl Azide Polymer-Based Energetic Thermoplastic Elastomer

“…Ishikawa T. et al [ 17 ] conducted a three-dimensional non-isothermal simulation study of the kneading zone of the co-rotating twin-screw extruder at different speeds and compared the simulation results with the experimental observation to verify the accuracy of the simulation. In addition, Khalifeh et al [ 18 ] investigated the numerical application of non-isothermal flows in a two-channel single-screw extruder using the finite volume method. Therefore, in order to achieve the expected quality throughout the manufacturing process of energetic materials, it is necessary not only to analyze the raw materials and process parameters [ 19 , 20 ] but also to pay special attention to the mechanical properties of these compounds during the extrusion process [ 21 ].…”