Measurements of the time-varying flow in a centrifugal blood pump operating as a left ventricular assist device (LVAD) are presented. This includes changes in both the pump flow rate as a function of the left ventricle contraction and the interaction of the rotating impeller and fixed exit volute. When operating with a pulsing ventricle, the flow rate through the LVAD varies from during each cycle of the heartbeat. Phase-averaged measurements of mean velocity and some turbulence statistics within several regions of the pump, including the inlet, blade passage, exit volute, and diffuser, are reported at 20 phases of the cardiac cycle. The transient flow fields are compared to the constant flow rate condition that was reported previously in order to investigate the transient effects within the pump. It is shown that the quasi-steady assumption is a fair treatment of the time varying flow field in all regions of this representative pump, which greatly simplifies the comprehension and modeling of this flow field. The measurements are further interpreted to identify the effects that the transient nature of the flow field will have on blood damage. Although regions of recirculation and stagnant flow exist at some phases of the cardiac cycle, there is no location where flow is stagnant during the entire heartbeat.
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April 2005
Article
PIV Measurements of Flow in a Centrifugal Blood Pump: Time-Varying Flow
James C. McDaniel
James C. McDaniel
The University of Virginia
, Charlottesville, VA 22903
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Steven W. Day
James C. McDaniel
The University of Virginia
, Charlottesville, VA 22903J Biomech Eng. Apr 2005, 127(2): 254-263 (10 pages)
Published Online: September 20, 2004
Article history
Received:
October 7, 2003
Revised:
September 20, 2004
Citation
Day, S. W., and McDaniel, J. C. (September 20, 2004). "PIV Measurements of Flow in a Centrifugal Blood Pump: Time-Varying Flow." ASME. J Biomech Eng. April 2005; 127(2): 254–263. https://doi.org/10.1115/1.1865190
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