Abstract
One of the stages of producing multilayer films and two-component fibers (including optical fibers) is joint extrusion of two or more molten polymers through a forming channel. Here there is layered or stratified flow [i]. Areas of steady-state stratified flow are the most completely studied where the profile of the flow rate and the position of the interface of the liquid layers is unchanged over the length of the channel [1-4]. Fewer works are devoted to studying the initial area of combined flow where, as is shown in an experiment in [5] and in theoretical finite element analysis [6], the coordinates of the interface vary considerably.
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