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Flow visualization studies to improve the spiral pump design

A Andrade1, J Biscegli, J E Sousa

  • 1Department of Bioengineering, Institute Dante Pazzanese of Cardiology, Sao Paulo, Brazil.

Artificial Organs
|July 1, 1997
PubMed
Summary
This summary is machine-generated.

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The spiral pump (SP) effectively reduces recirculation and improves hydrodynamic performance. Modifications to the impeller design, such as adding more leads, enhance efficiency in high-pressure conditions.

Area of Science:

  • Fluid Dynamics
  • Mechanical Engineering

Background:

  • The spiral pump (SP) integrates centrifugal and axial pumping principles.
  • Its design features a conical impeller with surface threads.

Purpose of the Study:

  • To investigate flow behavior in critical areas of the spiral pump.
  • To evaluate the impact of impeller modifications on pump performance.

Main Methods:

  • Flow visualization using glycerin-water solution and illuminated Amberlite particles.
  • Particle velocity recording with black and white film.
  • Flow behavior analysis with micro video camera and color video printer.

Main Results:

  • No turbulence or stagnant zones were observed in the inlet/outlet ports.

Related Experiment Videos

  • Recirculation occurred at the impeller thread tops with a single-lead design under increased pressure.
  • Modifications, including a 2-lead thread and increased cone angle, reduced recirculation.

    • Conclusions:

    • Impeller modifications significantly enhance the spiral pump's hydrodynamic performance.
    • The improved designs are particularly effective in high-pressure applications (>200 mm Hg).