Masters Theses
Abstract
"Mechanical heart valve (MHV) flows are characterized by high shear-stress, regions of recirculation and high levels of turbulent fluctuations which are hostile for blood. In the ongoing effort to reduce long-term complications and to reduce fatalities, it is important that the flow characteristics of the mechanical valves in all possible flow conditions are understood. Little research has been done to study the flow through bileaflet MHVs at low heart beat rate. As an initial effort, the present study is aimed at developing a new measurement method to study the fluid characteristics at the exit of custom-made bileaflet mechanical heart valves induced by a piston driven periodic flow at 45 beats per min. Ultrasonic Doppler Velocimetry (UDV) method providing spatiotemporal information was employed to map the flow field. Flows downstream of five different custom-made bileaflet valves were studied to understand the flow characteristics at different opening angles. Approximate and phase-averaged velocity data was collected, and spatial velocity contours and vector plots were drawn at different axial locations to identify the differences in the flow characteristics generated by these valves. These graphs provide detailed information about the development of the flow.
The results are in good agreement with those obtained from other measurement methods viz. Laser Doppler Velocimetry, Particle Image Velocimetry etc. which supports the view that UDV method is also a viable method for studying heart valves. Vortex formation was observed at the start of the systole. Vortices formed through the central slit were observed to propagate faster than those formed by the jets from underneath the leaflets"-- Abstract, p. iii
Advisor(s)
Tokuhiro, Akira
Committee Member(s)
Homan, Kelly
Armaly, B. F. (Bassem F.)
Department(s)
Mechanical and Aerospace Engineering
Degree Name
M.S. in Mechanical Engineering
Publisher
University of Missouri--Rolla
Publication Date
Summer 2004
Pagination
xii, 139 pages, CD-ROM
Note about bibliography
Includes bibliographical references (pages 134-138)
Rights
© 2004 Raghu Kadava, All rights reserved.
Document Type
Thesis - Restricted Access
File Type
text
Language
English
Subject Headings
Heart valves -- Ultrasonic imaging regional blood flow -- Measurement Fluid dynamic measurements Doppler ultrasonography
Thesis Number
T 8611
Print OCLC #
58476443
Recommended Citation
Kadava, Raghu, "Measurement of velocity fields at the exit of mechanical heart valve models using ultrasonic doppler velocimetry" (2004). Masters Theses. 4094.
https://scholarsmine.mst.edu/masters_theses/4094
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Comments
Accompanying CD-ROM, available at Missouri S&T Library, contains animation files.
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