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Related Experiment Videos

The pressure-flow method: some fundamental concepts.

C C Yates1, B J McWilliams, L D Vallino

  • 1School of Engineering, University of Pittsburgh, PA 15261.

The Cleft Palate Journal
|April 1, 1990
PubMed
Summary
This summary is machine-generated.

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The pressure-flow method for estimating velopharyngeal orifice area requires geometric similarity. The flow coefficient (k) may be higher than 0.65, depending on orifice shape, challenging current assumptions.

Area of Science:

  • Physiology
  • Fluid Dynamics
  • Medical Engineering

Background:

  • The pressure-flow method is utilized for estimating velopharyngeal orifice area.
  • This method relies on a flow coefficient (k) for accurate calculations.

Purpose of the Study:

  • To investigate the validity of the flow coefficient (k) in the pressure-flow method for estimating velopharyngeal orifice area.
  • To determine the influence of geometric similarity and orifice shape on the flow coefficient (k).

Main Methods:

  • Analysis of the pressure-flow method and its underlying assumptions.
  • Review of existing literature values for the flow coefficient (k).
  • Steady-state flow tests using a model simulating the velopharyngeal passage.

Related Experiment Videos

Main Results:

  • Geometric similarity between the subject and model is crucial for establishing the flow coefficient (k).
  • The commonly used k=0.65 may not accurately represent the velopharyngeal passage due to its thin-plate orifice geometry.
  • Inlet shape significantly impacts the flow coefficient (k), suggesting values potentially ranging from 0.9 to 0.97.

Conclusions:

  • The applicability of the pressure-flow method is contingent upon geometric similarity.
  • The flow coefficient (k) for velopharyngeal orifice area estimation may need adjustment based on specific orifice geometry, potentially exceeding 0.65.
  • Further research into the effect of inlet shapes on k is warranted for more accurate velopharyngeal function assessment.