Flow patterns in dog aortic arch under a steady flow condition simulating mid-systole

1996 ◽  
Vol 11 (4) ◽  
pp. 180-191 ◽  
Author(s):  
Shunsuke Endo ◽  
Yasunori Sohara ◽  
Takeshi Karino
Keyword(s):  
Aortic Arch ◽  
Steady Flow ◽  
Flow Condition ◽  
Flow Patterns ◽  
Steady Flow Condition

scholarly journals Flow Patterns in the Dog Descending Aorta under a Steady Flow Condition Simulating Mid-Systole

2004 ◽  
Vol 47 (4) ◽  
pp. 1000-1009 ◽  
Author(s):  
Shunsuke ENDO ◽  
Harry Leonardo GOLDSMITH ◽  
Takeshi KARINO
Keyword(s):  
Steady Flow ◽  
Flow Condition ◽  
Flow Patterns ◽  
Descending Aorta ◽  
Steady Flow Condition

Experimental Study of a Radial Turbine Using Floating Nozzle for Wave Energy Conversion

2009 ◽  
Author(s):  
Toshio Konno ◽  
Yoshihiro Nagata ◽  
Manabu Takao ◽  
Toshiaki Setoguchi
Keyword(s):  
Energy Conversion ◽  
Steady Flow ◽  
Wave Energy ◽  
Flow Condition ◽  
Radial Flow ◽  
Guide Vane ◽  
Wave Energy Conversion ◽  
Wells Turbine ◽  
Radial Turbine ◽  
Steady Flow Condition

The objective of this study is to propose a new radial flow turbine for wave energy conversion and to clarify its performance by model testing under steady flow condition. The proposed radial turbine has a rotor blade row for unidirectional airflow and two guide vane rows. The guide vane rows are named ‘floating nozzle’ in the study. The guide vane rows slide in an axial direction and work as nozzle in the turbine alternately for bi-directional airflow, so as to rectify bidirectional airflow and to make uni-directional airflow. The radial flow turbine with a diameter of 500mm has been manufactured and investigated experimentally under steady flow condition generated by a wind tunnel using a piston/cylinder system with a diameter of 1.4m. As a result, it has been found in the study that the peak efficiency of the proposed radial turbine is approximately 57% and the rotational speed of this turbine is considerably lower that that of Wells turbine. Further, the effect of nozzle setting angle on the turbine performance was investigated and clarified in the study.

Pressure Drops Through Arterial Stenosis Models in Steady Flow Condition

1992 ◽  
Vol 114 (3) ◽  
pp. 416-418 ◽  
Author(s):  
S. Cavalcanti ◽  
P. Bolelli ◽  
E. Belardinelli
Keyword(s):  
Pressure Drop ◽  
Steady Flow ◽  
Flow Condition ◽  
Momentum Equation ◽  
Arterial Stenosis ◽  
Pressure Drops ◽  
Area Reduction ◽  
Steady Flow Condition ◽  
Equidistant Points ◽  
Arterial Stenoses

Measures of pressure drops were made in two different plexiglass models of axial-symmetric arterial stenoses. The stenosis models had the same are reduction (86 percent) but were of different length so as to have a different tapering degree. Pressures were measured in steady flow condition at three equidistant points of the stenosis: upstream, in the middle, and downstream. Results indicate that: the upstream-middle pressure drop is independent of tapering degree but is highly influenced by area reduction; moreover it is much greater than the middle-downstream drop. The upstream-middle pressure drop can be accurately predicted by means of a relationship deduced by the momentum equation.

A particle image velocimetry study on the pulsatile flow characteristics in straight tubes with an asymmetric bulge

2000 ◽  
Vol 214 (5) ◽  
pp. 655-671 ◽  
Author(s):  
S C M Yu ◽  
J B Zhao
Keyword(s):  
Particle Image Velocimetry ◽  
Steady Flow ◽  
Pulsatile Flow ◽  
Flow Condition ◽  
Particle Image ◽  
Flow Characteristics ◽  
Reynolds Numbers ◽  
Working Fluid ◽  
Flow Conditions ◽  
Image Velocimetry

Flow characteristics in straight tubes with an asymmetric bulge have been investigated using particle image velocimetry (PIV) over a range of Reynolds numbers from 600 to 1200 and at a Womersley number of 22. A mixture of glycerine and water (approximately 40:60 by volume) was used as the working fluid. The study was carried out because of their relevance in some aspects of physiological flows, such as arterial flow through a sidewall aneurysm. Results for both steady and pulsatile flow conditions were obtained. It was found that at a steady flow condition, a weak recirculating vortex formed inside the bulge. The recirculation became stronger at higher Reynolds numbers but weaker at larger bulge sizes. The centre of the vortex was located close to the distal neck. At pulsatile flow conditions, the vortex appeared and disappeared at different phases of the cycle, and the sequence was only punctuated by strong forward flow behaviour (near the peak flow condition). In particular, strong flow interactions between the parent tube and the bulge were observed during the deceleration phase. Stents and springs were used to dampen the flow movement inside the bulge. It was found that the recirculation vortex could be eliminated completely in steady flow conditions using both devices. However, under pulsatile flow conditions, flow velocities inside the bulge could not be suppressed completely by both devices, but could be reduced by more than 80 per cent.

scholarly journals Animated versus static views of steady flow patterns

2016 ◽  
Author(s):  
Colin Ware ◽  
Daniel Bolan ◽  
Ricky Miller ◽  
David H. Rogers ◽  
James P. Ahrens
Keyword(s):  
Steady Flow ◽  
Flow Patterns
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