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Rotodynamic pump scaling.

Markus Lorenz1, William A Smith

  • 1Cleveland Clinic Foundation, Department for Biomedical Engineering, Ohio 44195, USA.

ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|July 27, 2002
PubMed
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Scaling techniques for rotodynamic blood pumps are valid. A new correction factor accounts for Reynolds Number effects, significantly reducing design errors and ensuring reliable pump performance.

Area of Science:

  • Fluid Dynamics
  • Biomedical Engineering
  • Mechanical Engineering

Background:

  • Rotodynamic pump design traditionally relies on similarity laws and experimental data.
  • Scaling laws are commonly used for large or small pumps, but their applicability to blood pumps is questioned due to low Reynolds Numbers.
  • Extraneous effects in small-scale blood pumps can compromise similarity assumptions.

Purpose of the Study:

  • To evaluate the validity of scaling techniques in rotodynamic blood pump design.
  • To investigate the impact of geometric scaling and Reynolds Number on similitude quality.
  • To develop a correction factor for Reynolds Number effects to improve design accuracy.

Main Methods:

  • Three geometrically similar pumps with scaling factors of 1, 3.2, and 6.4 were tested.

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  • Nondimensionalized pump data was compared to assess the quality of similitude.
  • A correction factor was developed based on Reynolds Number, Flow Coefficient, specific speed, and surface roughness.

    • Main Results:

    • Geometric scaling had a minimal impact on similitude quality (max 5.8% error).
    • Reynolds Number effects significantly impacted similitude quality, especially at high flows (max 45.4% error).
    • The developed correction factor reduced Reynolds Number related errors to a maximum of 7.5%.

    Conclusions:

    • Scaling techniques are a valid approach for rotodynamic blood pump design.
    • Maintaining Reynolds Number similarity or applying correction factors is crucial for accurate design.
    • The developed correction factor enhances the reliability of scaled blood pump designs.