Experimental Investigation Of Flow Through A
Bileaflet Mechanical Heart Valve
Author(s)
J. Mejia & P. Oshkai
Abstract
Turbulent flow downstream of a bileaflet mechanical heart valve is investigated
using digital particle image velocimetry. Evolution of flow structures during the
systole and diastole phases of a typical cardiac cycle is characterized by
obtaining global flow velocity measurements in multiple cross-sections of the
flow field. Instantaneous and time-averaged patterns of flow velocity, vorticity,
and streamline topology are used to illustrate the interaction between the
unsteady vortices that results in elevation of shear stress levels. This imagebased
approach can potentially lead to the development of methods for the
control of platelet activation and provides insight into the underlying flow
physics.
Keywords: bileaflet mechanical heart valves, particle image velocimetry,
in-vitro.
1 Introduction
Currently, about 180,000 prosthetic heart valves are implanted each year
worldwide, Yoganathan et al. [1]. Mechanical Heart Valves (MHVs) are
relatively durable but strongly associated with thromboembolisms, which often
result in ischemic attacks and stroke, Yin et al. [2]. It is believed that thrombi are
caused by flow phenomena not characteristic of physiological conditions,
Bluestien et al. [3]. The flow phenomena that receive the most attention in this
respect include: jet-like flow regions, regions of elevated shear stress, flow
separation regions, shed vortices, and turbulence characteristics, Yin et al. [2]
Despite the recent advances in the field, thromboembolisms occur in
Keywords
bileaflet mechanical heart valves, particle image velocimetry,
in-vitro.
Related Book
Other papers in this volume
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