scholarly journals Assessment of viscous energy loss and the association with three-dimensional vortex ring formation in left ventricular inflow: In vivo evaluation using four-dimensional flow MRI

2016 ◽  
Vol 77 (2) ◽  
pp. 794-805 ◽  
Author(s):  
Mohammed S.M. Elbaz ◽  
Rob J. van der Geest ◽  
Emmeline E. Calkoen ◽  
Albert de Roos ◽  
Boudewijn P.F. Lelieveldt ◽  
...  
Keyword(s):  
Energy Loss ◽  
Vortex Ring ◽  
Three Dimensional ◽  
Left Ventricular ◽  
Ring Formation ◽  
In Vivo Evaluation ◽  
Dimensional Flow ◽  
Vortex Ring Formation ◽  
Flow Mri

Circulation Generation and Vortex Ring Formation by Conic Nozzles

2009 ◽  
Vol 131 (9) ◽  
Author(s):  
Moshe Rosenfeld ◽  
Kakani Katija ◽  
John O. Dabiri
Keyword(s):  
Vortex Ring ◽  
Vortex Generator ◽  
Ring Formation ◽  
Vortex Rings ◽  
Two Dimensional ◽  
One Dimensional ◽  
Dimensional Flow ◽  
Vortex Ring Formation ◽  
Exit Nozzle ◽  
Two Dimensional Flow

Vortex rings are one of the fundamental flow structures in nature. In this paper, the generation of circulation and vortex rings by a vortex generator with a static converging conic nozzle exit is studied numerically. Conic nozzles can manipulate circulation and other flow invariants by accelerating the flow, increasing the Reynolds number, and by establishing a two-dimensional flow at the exit. The increase in the circulation efflux is accompanied by an increase in the vortex circulation. A novel normalization method is suggested to differentiate between two contributions to the circulation generation: a one-dimensional slug-type flow contribution and an inherently two-dimensional flow contribution. The one-dimensional contribution to the circulation increases with the square of the centerline exit velocity, while the two-dimensional contribution increases linearly with the decrease in the exit diameter. The two-dimensional flow contribution to the circulation production is not limited to the impulsive initiation of the flow only (as in straight tube vortex generators), but it persists during the entire ejection. The two-dimensional contribution can reach as much as 44% of the total circulation (in the case of an orifice). The present study offers evidences on the importance of the vortex generator geometry, and in particular, the exit configuration on the emerging flow, circulation generation, and vortex ring formation. It is shown that both total and vortex ring circulations can be controlled to some extent by the shape of the exit nozzle.

scholarly journals Vortex Ring Formation in the Left Ventricle of the Heart: Analysis by 4D Flow MRI and Lagrangian Coherent Structures

2012 ◽  
Vol 40 (12) ◽  
pp. 2652-2662 ◽  
Author(s):  
Johannes Töger ◽  
Mikael Kanski ◽  
Marcus Carlsson ◽  
Sándor J. Kovács ◽  
Gustaf Söderlind ◽  
...  
Keyword(s):  
Left Ventricle ◽  
Vortex Ring ◽  
Coherent Structures ◽  
Ring Formation ◽  
Lagrangian Coherent Structures ◽  
4D Flow Mri ◽  
4D Flow ◽  
Vortex Ring Formation ◽  
Flow Mri

scholarly journals In Vitro and In Vivo Evaluation of a Three-Dimensional Porous Multi-Walled Carbon Nanotube Scaffold for Bone Regeneration

Nanomaterials ◽  
2017 ◽  
Vol 7 (2) ◽  
pp. 46 ◽  
Author(s):  
Manabu Tanaka ◽  
Yoshinori Sato ◽  
Mei Zhang ◽  
Hisao Haniu ◽  
Masanori Okamoto ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Bone Regeneration ◽  
Three Dimensional ◽  
In Vivo Evaluation ◽  
Multi Walled Carbon Nanotube

scholarly journals Investigation of vortex ring formation with account of generator piston motion

2017 ◽  
Vol 208 ◽  
pp. 012045 ◽  
Author(s):  
I V Khramtsov ◽  
VV Palchikovskiy ◽  
A A Siner ◽  
Yu V Bersenev
Keyword(s):  
Vortex Ring ◽  
Ring Formation ◽  
Piston Motion ◽  
Vortex Ring Formation
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