EFFICIENCY OF URINE PUMPING IN THE HUMAN URETER

Abstract

The efficiency of peristaltic pumping mechanism in the flow of urine from the kidneys to the
bladder through the ureter is studied based on Liron‟s model, but with no applied external
pressure gradient, in strict compliance with natural peristalsis situation as appears in physical
organs. By applying the zeroth-order solutions, it is observed that in this study, the major
contributing factor is the wave-plows (r) of the peristaltic motion of the flow tract rather than the
Reynolds‟s number that has a direct bearing on the fluid property. But as would be expected, the
Reynolds number appears in the generated axial pressure-gradient as well as the mean rate of
mechanical work. The graph of variation of E with respect to r shows similar pattern as velocity
profiles as shown in previous studies. This confirms the earlier assertion about the effect of the
peristaltic motion.