scholarly journals Visualization and Measurement of Velocity Profile in Pulsatile Flow through 180°Curved Circular Tube Using a Laser Induced Fluorescence Method

1993 ◽  
Vol 13 (Supplement2) ◽  
pp. 53-56
Author(s):  
Hiroyuki KAMINO ◽  
Kenkichi OHBA ◽  
Atsushi SAKURAI
Keyword(s):  
Velocity Profile ◽  
Pulsatile Flow ◽  
Circular Tube ◽  
Laser Induced Fluorescence ◽  
Fluorescence Method ◽  
Flow Through

Effect of Tapering on Pulsatile Flow Through a U-Tube Model of the Human Aortic Arch

2010 ◽  
Author(s):  
Masaru Sumida
Keyword(s):  
Velocity Profile ◽  
Pulsatile Flow ◽  
Velocity Profiles ◽  
Cross Sectional Area ◽  
Flow Rate Ratio ◽  
Sectional Area ◽  
Cross Sectional ◽  
Turn Angle ◽  
Flow Through ◽  
The Cross

An experimental investigation of pulsatile flow through a tapered U-tube was performed to study the blood flow in the aorta. The experiments were carried out in a U-tube with a curvature radius ratio of 3.5 and a 50% reduction in the cross-sectional area from the entrance to the exit of the curved section. Velocity measurements were conducted by a laser Doppler velocimetry for a Womersley number of 10, a mean Dean number of 400 and a flow rate ratio of 1. The velocity profiles for pulsatile flow in the tapered U-tube were compared with the corresponding results in a U-tube having a uniform cross-sectional area. The striking effects of the tapering on the flow are exhibited in the axial velocity profiles in the section from the latter half of the bend to the downstream tangent immediately behind the bend exit. A depression in the velocity profile appears at a smaller turn angle Ω in the case of tapering, although the magnitude of the depression relative to the cross-sectional average velocity decreases. The value of β, which indicates the uniformity in the velocity profile over the cross section, decreases with increasing Ω, whereas it rapidly increases immediately behind the bend exit.

Creeping Viscous Flow Through a Circular Tube of Nonuniform Cross Section

1972 ◽  
Vol 39 (3) ◽  
pp. 657-660 ◽  
Author(s):  
W. E. Langlois
Keyword(s):  
Velocity Profile ◽  
Viscous Flow ◽  
Cross Section ◽  
Circular Tube ◽  
Pressure Gradients ◽  
Local Velocity ◽  
Slowly Varying Function ◽  
Flow Through ◽  
Pipe Radius

Creeping viscous flow in a nonuniform pipe is analyzed by taking the local velocity profile and pressure gradients to be those of flow in a cone-shaped region. With this approach it is not necessary to assume that the pipe radius is a slowly varying function of distance along the axis.

Sign in / Sign up

Export Citation Format

Share Document