Kaplan-Tadmor model

Kaplan and Tadmor (74) proposed a mathematical model for isothermal pumping in this extruder for Newtonian fluids, which they termed the three plate model. We follow that... 

Kaplan and Tadmor (73) expanded the model to include leakage flow effects, considered non-Newtonian fluids, and verified the model experimentally with a polyisobutylene. We discuss the flow further in a tangential, nonintermeshing TSE in Chapter 10. 

A. Kaplan and Z. Tadmor, Theoretical Model for Non-Intermeshing Twin Screw Extruders, Polym. Eng. Sci., 14, 58-66 (1974). 

The first theoretical study of the conveying process in non-intermeshing twin screw extruders was made by Kaplan and Tadmor [17]. They simplified the actual geometry (see Fig. 10.42) to a flat plate model. 

The mathematical description of the conveying action of non-intermeshing twin-screw extruders consists of a three-parallel-plate model, similar to the two-parallel-plate model used in single-screw extrusion. The outside plates represent the screw surfaces and the middle plate (with zero thickness) represents the barrel. The apex is accounted for by parallel slots in the middle plate, perpendicular to the circumferential velocity. Using this model Kaplan and Tadmor [8] derived an expression for the throughput for Newtonian flows ... 

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