The flow of non- Newtonian fluids through corrugated pipes

This paper is concerned with the behaviour of non-Newtonian fluid under constant pressure gradient through a straight, corrugated pipe of circular cross- section. We used a class of generalized Newtonian models which includes a dependence on the third invariant of the deformation tensor. Four viscosity function have been used to demonstrate the effect of extensional - thickening and shear-thinning upon such flow. A finite difference technique has been used to solve the resulting equations. (author). 16 refs., 7 figs., 7 tabs