Abstract
The purpose of this work is to develop and to compare different methods for the determination of startup flows of a pseudoplastic fluid in pipes under a varying pressure gradient. Three methods are proposed: 1. A method involving a finite-difference calculation. 2. A method using an approximation of the acceleration term in the equation governing the phenomenon. 3. An experimental method based on measurements of local velocities by means of Laser-Doppler anemometry. The most interesting point of this work is the good agreement observed between the three methods in the non-Newtonian case.
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