Abstract
Single-screw extruders are the most common equipment used for polymer extrusion. The study of the hydrodynamics of a polymer melts flow in the extruder channel is the basis for modeling and understanding the extrusion process. In general form, the extruder includes a straight section with a screw installed in it. In this study, the three-dimensional mathematical modeling of the polymer solutions flow in the metering zone of a single-screw extruder is performed. The influences of the screw geometry (L/D2 = 1…3) on the flow structure and the pressure drop are analyzed under a speed rotation up to 60 rpm. Aqueous solutions of 0.5% polyacrylamide (0.5% PAA) and 1.5% sodium salt of carboxymethyl cellulose (1.5% CMC) are considered as the working fluid.
Highlights
The single-screw extruders are the classic equipment in the processing of polymers [1]
This study examined aqueous solutions of polyacrylamide and sodium carboxymethyl cellulose
Results arepresented presented for thewhen case hydrodynamic section in thein channel with awith screw
Summary
The single-screw extruders are the classic equipment in the processing of polymers [1]. It is very difficult to observe the processes occurring in the extruder channel, one of the possible ways to control and determine the rational parameters of the entire extrusion process is mathematical modeling. In [3,4], it is noted that currently, it is difficult to obtain an exact analytical solution to even a simplified mathematical model of the extrusion process (one-dimensional non-Newtonian flow). Analytical solutions of the problem of the Newtonian fluid isothermal flow in the channel of a single-screw extruder are known, which differ in the way they solve the system of differential equations [5,6]. Several works are devoted to semi-analytical solutions of a similar problem, where the rheological behavior of the polymer is described by a power law [7,8,9]
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