A finite element analysis has been carried out to study the fluid moti
on of non-Newtonian jets emanating from a converging channel. Three ty
pical non-Newtonian fluid models have been considered: the power-law f
luid, the modified-Bingham fluid and the Oldroyd-B fluid. The effects
of five parameters on the how field are analyzed in detail, these para
meters are: the contraction ratio of the channel gap far upstream to t
he gap at the channel exit L; the converging angle of the channel thet
a; the power-law index n; the Bingham number Bn and the Weissenberg nu
mber We. (C) 1998 Elsevier Science Ltd. All rights reserved.