On the flow through the human female urethra

Mark Bush, P.E. Papa Petros, B. R. Barrett-Lennard

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)


Abstract-The flow characteristic for a human female urethra is determined by direct measurement of flow rate
and pressure difference data. The measurements are made on a full-scale physical model of a urethra in its open
state. which was created using dimensional information taken from video cystograms. The measured data therefore
include viscous dissipation effects associated with developing flow, changes in cross-sectional area and changes in
flow direction. These effects are often ignored in mathematical models of this system. The data may therefore assist
in the development and testing of more realistic models for urine flow. The measured characteristic is compared
with a mathematical model of the flow based on a straight tube of uniform diameter carrying fully developed
turbulent flow. When the diameter of the model tube is chosen to be equal to the distal diameter of the urethra, it is
observed that the predicted flow characteristic provides a good first approximation to the measured characteristic,
despite the substantial differences in geometry and flow regime between the mathematical model and the actual
system. .r‘ 1997 Elsevier Science Ltd
Kej-~~&.s: Micturition; Urethra; Urethral resistance; Urine flow: Fluid dynamics.
Original languageEnglish
Pages (from-to)967-969
JournalJ. Biomechanics
Issue number9
Publication statusPublished - 1997


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