Abstract

In this work, estimates of turbulence were made from pulsatile flow laser Doppler velocimetry measurements using traditional phase averaging and averaging after the removal of cyclic variation. These estimates were compared with estimates obtained from steady leakage flow LDV measurements and an analytical method. The results of these studies indicate that leakage jets which are free and planar in shape may be more unstable than other leakage jets, and that cyclic variation does not cause a gross overestimation of the Reynolds stresses at large distances from the leakage jet orifice.

Issue Section:
Technical Papers
Keywords:
prosthetics, cardiology, pulsatile flow, jets, Doppler measurement, blood flow measurement, laser applications in medicine, laser velocimetry
Topics:
Flow (Dynamics), Jets, Leakage, Pulsatile flow, Shear stress, Turbulence, Valves, Leakage flows, Stress, Prostheses, Shapes
1.
Garver
,
D.
,
Kaczmarek
,
R.
,
Silverman
,
B.
,
Gross
,
T.
, and
Hamilton
,
P.
,
1998
, “
The Epidemiology of Prosthetic Heart Valves in the United States
,”
Tex Heart Inst. J.
,
22
, No.
1
, pp.
86
–
91
.
2.
Sallam
,
A.
, and
Hwang
,
N.
,
1984
, “
Human Red Blood Cell Hemolysis in a Turbulent Shear Flow: Contribution of Reynolds Shear Stresses
,”
Biorheology
,
21
, pp.
783
–
797
.
3.
Brown
,
C.
,
Leverett
,
L.
,
Lewis
,
C.
,
Alfrey
,
C.
, and
Hellums
,
J.
,
1975
, “
Morphological, Biochemical, and Functional Changes in Human Platelets Subjected to Shear Stress
,”
J. Lab. Clin. Med.
,
86
, No.
3
, pp.
462
–
471
.
4.
Hung
,
T.
,
Hochmuth
,
R.
,
Joist
,
J.
, and
Sutera
,
S.
,
1976
, “
Shear-Induced Aggregation and Lysis of Platelets
,”
ASAIO J.
,
22
, pp.
285
–
290
.
5.
Wurzinger
,
L.
,
Blasberg
,
P.
, and
Schmid-Schonbein
,
H.
,
1985
, “
Towards a Concept of Thrombosis in Accelerated Flow. Rheology, Fluid Dynamics, and Biochemistry
,”
Biorheology
,
22
, pp.
437
–
449
.
6.
Karino
,
T.
, and
Goldsmith
,
H.
,
1979
, “
Aggregation of Human Platelets in an Annular Vortex Distal to a Tubular Expansion
,”
Microvasc. Res.
,
17
, pp.
217
–
237
.
7.
Karino
,
T.
, and
Goldsmith
,
H.
,
1984
, “
Role of Blood Cell-Wall Interactions in Thrombogenesis and Atherogenesis: a Microrheological Study
,”
Biorheology
,
21
, pp.
587
–
601
.
8.
Ellis
,
J.
,
Healy
,
T.
,
Fontaine
,
A.
,
Saxena
,
R.
, and
Yoganathan
,
A.
,
1996
, “
Velocity Measurements and Flow Patterns Within the Hinge Region of a Medtronic Parallel Bileaflet Mechanical Valve with Clear Housing
,”
J. Heart Valve Dis.
,
5
, pp.
591
–
599
.
9.
Ellis
,
J.
,
Healy
,
T.
,
Fontaine
,
A.
,
Weston
,
M.
,
Jarret
,
C.
,
Saxena
,
R.
, and
Yoganathan
,
A.
,
1996
, “
An In Vitro Investigation of the Retrograde Flow Fields of Two Bileaflet Mechanical Heart Valves
,”
J. Heart Valve Dis.
,
5
, pp.
600
–
606
.
10.
Maymir
,
J.
,
Deutsch
,
S.
,
Meyer
,
R.
,
Geselowitz
,
D.
, and
Tarbell
,
J.
,
1997
, “
Effects of Tilting Disk Heart Valve Gap Width on Regurgitant Flow Through an Artificial Heart Valve
,”
Artif. Organs
,
21
, No.
9
, pp.
1014
–
1025
.
11.
Meyer
,
R.
,
Deutsch
,
S.
,
Maymir
,
J.
,
Geselowitz
,
D.
, and
Tarbell
,
J.
,
1997
, “
Three Component Laser Doppler Velocimetry Measurements in the Regurgitant Flow Region of a Bjork-Shiley Monostrut Mitral Valve
,”
Ann. Biomed. Eng.
,
25
, pp.
1081
–
1091
.
12.
Steegers
,
A.
,
Paul
,
R.
,
Reul
,
H.
, and
Rau
,
G.
,
1999
, “
Leakage Flow at Mechanical Heart Valve Prostheses: Improved Washout or Increased Blood Damage?
”
J. Heart Valve Dis.
,
8
, pp.
312
–
321
.
13.
Ellis
,
J.
, and
Yoganathan
,
A.
,
2000
, “
A Comparison of the Hinge and Near-Hinge Flow Fields of the St. Jude Medical Hemodynamic Plus and Regent Bileaflet Mechanical Heart Valves
,”
J. Thorac. Cardiovasc. Surg.
,
119
, pp.
83
–
93
.
14.
Healy
,
T.
,
Ellis
,
J.
,
Fontaine
,
A.
,
Jarrett
,
C.
, and
Yoganathan
,
A.
,
1997
, “
An Automated Method for the Visualization and Analysis of Laser Doppler Velocimetry Data
,”
Ann. Biomed. Eng.
,
25
, No.
2
, pp.
335
–
343
.
15.
Tiederman
,
W.
,
Steinle
,
M.
, and
Phillips
,
W.
,
1986
, “
Two Component Laser Velocimeter Measurements Downstream of Heart Valve Prostheses in Pulsatile Flow
,”
J. Biomed. Eng.
,
108
, pp.
59
–
64
.
16.
Montgomery, D., 1991, Design and Analysis of Experiments, Wiley, New York, NY.
17.
Blevins, R., 1989, Applied Fluid Dynamics Handbook, Van Nostrond Reinhold, New York, NY.
18.
Bradbury
,
L.
,
1965
, “
The Plane Jet
,”
J. Fluid Mech.
,
23
, pp.
31
–
64
.
19.
Nygaard
,
H.
,
Giersiepen
,
M.
,
Hasenkam
,
J.
,
Westphal
,
D.
,
Paulsen
,
P.
, and
Reul
,
H.
,
1990
, “
Estimation of turbulent shear stresses in pulsatile flow immediately downstream of two artificial aortic valves in vitro
,”
J. Biomech.
,
23
, No.
12
, pp.
1231
–
8
.
20.
Glauert
,
M.
,
1956
, “
The Wall Jet
,”
J. Fluid Mech.
,
1
, pp.
625
–
643
.
21.
Launder, B., and Rodi, W., 1983, “The Turbulent Wall Jet-Measurements and Modeling,” Annual Review of Fluid Mechanics, 15, Annual Reviews Inc., Palo Alto, CA.
22.
Tiederman
,
W.
,
Privette
,
R.
, and
Phillips
,
W.
,
1988
, “
Cycle-to-Cycle Variation Effects on Turbulent Shear Stress Measurements in Pulsatile Flows
,”
Exp. Fluids
,
6
, pp.
265
–
272
.
23.
Liu
,
J.
,
Lu
,
P.
, and
Chu
,
S.
,
2000
, “
Turbulence Characteristics, Downstream of Bileaflet Aortic Valve Prostheses
,”
ASME J. Biomech. Eng.
,
122
, pp.
118
–
124
.
24.
Einav
,
S.
, and
Sokolow
,
M.
,
1993
, “
An Experimental Study of Pulsatile Pipe Flow in the Transition Range
,”
ASME J. Biomech. Eng.
,
115
, pp.
404
–
411
.
25.
Grigioni
,
M.
,
Daniele
,
C.
,
Da´venio
,
G.
, and
Barbaro
,
V.
,
2000
, “
On the Monodimensional Approach to the Estimation of the Highest Reynolds Shear Stress in a Turbulent Flow
,”
J. Biomech.
,
33
, pp.
701
–
708
.
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 by American Society of Mechanical Engineers
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