Abstract:
Oscillatory flow superimposed on steady laminar flow in a pipe (or channel) is considered and guiding
calculations are performed to inspect for conditions under which removal of particles and fouling layers from surfaces is superior.
Calculations are performed to derive conditions of flow reversal, which is cited in literature as one of the requirements for
removal of fouling layers. As wall shear stress is a relevant measure to evaluate removal of particle/fouling layers, calculations are
performed to derive the conditions under which wall shear stress with superimposed oscillatory flow is energy efficient. The
results are presented in the parameter space of a pressure gradient ratio (oscillatory/steady) and Womersley number. This phase
plot would be useful for experimentalist to locate operating regions whence energy efficient removal can be achieved using
superimposed oscillatory flow.
