الفهرس 
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Abstract
The thesis deals with the flow pattern of viscoelastic
fluids through the plate model of the screw extruder. The
calculation are carried out up to fluids of third order.
The calculation showed that the,.velacity distribution
. .
for fluids of second order coinaides ~ith that of fluids of
first order. The third order fluid leads to modification of
-the velocity distributi9n. The distribution of third order
veloc1~J matehes the experimental results in a better way
than first order distributions. The extention of the present
work to previd more realistic resul te to be compared with
technical problems are discussed.