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Modeling and Experimental Analysis of the Single-Shaft Coaxial Motor-Pump Assembly in Electrohydrostatic Actuators
Published on: June 13, 2022
Hydrodynamic performance and heat generation by centrifugal pumps.
Y Ganushchak1, W van Marken Lichtenbelt, T van der Nagel
1Department of Extra-Corporeal Circulation, University Hospital Maastricht, Maastricht, The Netherlands. yga@scpc.azm.nl
Perfusion
|February 23, 2007
Summary
Centrifugal blood pumps (CP) require careful hydraulic performance evaluation. Operating centrifugal pumps in a
Area of Science:
- Cardiovascular Engineering
- Biomedical Engineering
- Fluid Dynamics
Background:
- Centrifugal pumps (CP) are widely used but their application as blood pumps is relatively new, with limited hydraulic performance data.
- Understanding the hydraulic performance and heat generation of blood CP is crucial for safe clinical application.
Purpose of the Study:
- To investigate the hydraulic performance and heat generation of three commercial centrifugal blood pumps: Bio-Medicus Bio-Pump BP80, Rotaflow, and DeltaStream DP2.
- To analyze pump performance within their clinical 'operating regions' and assess stability and temperature changes.
Main Methods:
- Utilized a water-glycerin mixture (0.00272 pa/s viscosity) to simulate blood.
- Obtained pressure-flow curves via stepwise outlet/inlet stagnation.
- Measured temperature changes using ThermaCAM SC2000 (Flir Systems).
Main Results:
- Defined 'operating regions' for each pump based on speed (BP80: 3000 rpm, Rotaflow: 3000-4000 rpm, DP2: 7000-8000 rpm).
- Inlet stagnation resulted in significantly higher pressure variability than outlet stagnation for all pumps.
- Fluid heating was most pronounced in 'zero-flow' mode, particularly with inlet stagnation.
Conclusions:
- The 'zero-flow' regime is outside allowable operating limits and poses risks in clinical settings.
- Continuous monitoring of negative inlet pressure is essential for safe use of CP in kinetic-assisted venous return.
- Maximum allowable negative pressure must be defined per pump type based on performance data.
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