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Keywords: jets
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Journal Articles
Article Type: Research Papers
J Biomech Eng. April 2011, 133(4): 041002.
Published Online: February 17, 2011
... mimicked the flow fields in several medical devices, consisted of a gradual flow constriction, a narrow throat region, and a sudden expansion region where a fluid jet exited the center of the nozzle with recirculation zones near the model walls. Measurements of mean velocity and turbulent flow quantities...
Journal Articles
Article Type: Research Papers
J Biomech Eng. October 2010, 132(10): 101005.
Published Online: October 1, 2010
...Kai Chen; Hua Zhou; Ji Li; Gary J. Cheng A mathematical model has been presented for a high speed liquid jet penetration into soft solid by a needle-free injection system. The model consists of a cylindrical column formed by the initial jet penetration and an expansion sphere due to continuous...
Journal Articles
Article Type: Research Papers
J Biomech Eng. March 2010, 132(3): 031009.
Published Online: February 17, 2010
... boundary condition is applied at each branch outlet to study flow splitting. The PVAD anastomosis is found to alter the aortic flow dramatically. More flow is diverted into the great vessels with the PVAD support. Turbulence is found in the jet impingement area at peak systole for 100% bypass...
Journal Articles
Article Type: Research Papers
J Biomech Eng. November 2009, 131(11): 111005.
Published Online: October 16, 2009
... and the results are compared with a healthy aortic flow. All the analyses are based on a planar aortic model under steady inflow conditions for simplification. Our results reveal that the outflow cannulae induce high exit jet flows in the aorta, resulting in turbulent flow. The distal configuration causes more...
Journal Articles
Article Type: Research Papers
J Biomech Eng. May 2009, 131(5): 051010.
Published Online: April 14, 2009
... in the central, lateral, and commissural positions of the leaflet edge to study the suture position effect. Flow rate was 15 l/min. Velocity, Reynolds shear stress (RSS), and effective orifice area were assessed. A total of five mitral valves were tested. The normal mitral valve without the ETER had one jet...
Journal Articles
Article Type: Research Papers
J Biomech Eng. December 2008, 130(6): 061012.
Published Online: October 15, 2008
...-speed canulla jet flow ( ∼ 3.0 m / s at peak flow), which eventually stagnates at the anterior aortic arch wall and low velocity flow in the cross-clamp pouch. These structures contributed to the reduced flow pulsatility (85%), increased WSS (50%), power loss (28%), and blood damage (288%), compared...
Journal Articles
Article Type: Research Papers
J Biomech Eng. December 2008, 130(6): 061011.
Published Online: October 14, 2008
... was approximately 10. In the major-axis plane the flow fields were characterized by two jets that varied in lateral spacing. The rapid deceleration of flow at maximal collapse caused the jets momentarily to merge about one diameter into the downstream pipe, and strengthened and enlarged the existing retrograde flow...
Journal Articles
Article Type: Research Papers
J Biomech Eng. August 2008, 130(4): 041019.
Published Online: June 24, 2008
..., are becoming a viable option for pediatric patients. A major obstacle faced by VAD designers is thromboembolism. Previous studies have shown that the interrelated flow characteristics necessary for the prevention of thrombosis in a pulsatile VAD are a strong inlet jet, a late diastolic recirculating flow...
Journal Articles
Article Type: Technical Papers
J Biomech Eng. June 2006, 128(3): 380–390.
Published Online: November 17, 2005
... (divergence angle of 10 deg , minimal diameter of 0.04 cm real life). The acoustic level downstream of the vocal folds was measured by using a condenser microphone. False vocal folds (FVFs) were included. In general, the glottal flow was laminar and bistable. The glottal jet curvature increased with flow rate...
Journal Articles
Article Type: Technical Papers
J Biomech Eng. December 2005, 127(7): 1141–1146.
Published Online: July 26, 2005
..., and ultimately to graft failure due to thrombosis. Although the high AV access blood flow has been implicated in the pathogenesis of graft stenosis, the potential role of needle turbulence during hemodialysis is relatively unexplored. High turbulent stresses from the needle jet that reach the venous anastomosis...
Journal Articles
Article Type: Technical Papers
J Biomech Eng. April 2002, 124(2): 155–165.
Published Online: March 29, 2002
... 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...