Large amplitude pulsatile water flow across an orifice

E. L. Yellin, G. S. Peskin

Research output: Contribution to journalArticlepeer-review


The pressure-flow relations of large amplitude pulsatile water flows across an orifice have been investigated theoretically and experimentally. By retaining the unsteady term in the one-dimensional equation of motion, and by allowing the jet area to be a function of distance in the continuity equation, a lumped parameter relationship between pressure drop and flow has been developed which reflects the influence of inertia and dissipation. The results are applicable to the analysis of natural and prosthetic heart valves under normal and pathologic conditions. Within the physiologically possible conditions of frequency and flow rale, unsteady separated flows exhibit the same energy losses as comparable steady separated flows. Thus, the flow is quasisteady, even when the waveforms and temporal relations indicate a significant inertial influence.

Original languageEnglish (US)
Pages (from-to)92-95
Number of pages4
JournalJournal of Dynamic Systems, Measurement and Control, Transactions of the ASME
Issue number1
StatePublished - Mar 1975

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Information Systems
  • Instrumentation
  • Mechanical Engineering
  • Computer Science Applications


Dive into the research topics of 'Large amplitude pulsatile water flow across an orifice'. Together they form a unique fingerprint.

Cite this