Time Dependent Flow Patterns in Couette—Taylor Motion of Pure Viscous and Weakly Elastic Polymer Solutions

2008 ◽  
Author(s):  
Roland Kádár ◽  
Corneliu Balan ◽  
Albert Co ◽  
Gary L. Leal ◽  
Ralph H. Colby ◽  
...  
Keyword(s):  
Polymer Solutions ◽  
Flow Patterns ◽  
Time Dependent ◽  
Dependent Flow ◽  
Elastic Polymer

Rotation of Time-Dependent Flow Patterns near Convective Threshold

1986 ◽  
Vol 57 (11) ◽  
pp. 1380-1380 ◽  
Author(s):  
R. F. Folse ◽  
Lawrence R. Mead
Keyword(s):  
Flow Patterns ◽  
Time Dependent ◽  
Dependent Flow

scholarly journals Spectral Early-Warning Signals for Sudden Changes in Time-Dependent Flow Patterns

Fluids ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 49
Author(s):  
Moussa Ndour ◽  
Kathrin Padberg-Gehle ◽  
Martin Rasmussen
Keyword(s):  
Transfer Operator ◽  
Polar Vortex ◽  
Fluid Flows ◽  
Flow Patterns ◽  
Time Dependent ◽  
Mixing Processes ◽  
Dependent Flow ◽  
Antarctic Polar Vortex ◽  
Transport And Mixing ◽  
The Antarctic

Lagrangian coherent sets are known to crucially determine transport and mixing processes in non-autonomous flows. Prominent examples include vortices and jets in geophysical fluid flows. Coherent sets can be identified computationally by a probabilistic transfer-operator-based approach within a set-oriented numerical framework. Here, we study sudden changes in flow patterns that correspond to bifurcations of coherent sets. Significant changes in the spectral properties of a numerical transfer operator are heuristically related to critical events in the phase space of a time-dependent system. The transfer operator approach is applied to different example systems of increasing complexity. In particular, we study the 2002 splitting event of the Antarctic polar vortex.

Flow Mixing Enhancement from Balloon Pulsations in an Intravenous Oxygenator

2004 ◽  
Vol 127 (3) ◽  
pp. 400-415 ◽  
Author(s):  
Amador M. Guzmán ◽  
Rodrigo A. Escobar ◽  
Cristina H. Amon
Keyword(s):  
Numerical Simulations ◽  
Oxygen Transfer ◽  
Fiber Bundle ◽  
Transfer Rate ◽  
Oxygen Transfer Rate ◽  
Three Dimensional ◽  
Time Dependent ◽  
Fiber Placement ◽  
Flow Mixing ◽  
Dependent Flow

Computational investigations of flow mixing and oxygen transfer characteristics in an intravenous membrane oxygenator (IMO) are performed by direct numerical simulations of the conservation of mass, momentum, and species equations. Three-dimensional computational models are developed to investigate flow-mixing and oxygen-transfer characteristics for stationary and pulsating balloons, using the spectral element method. For a stationary balloon, the effect of the fiber placement within the fiber bundle and the number of fiber rings is investigated. In a pulsating balloon, the flow mixing characteristics are determined and the oxygen transfer rate is evaluated. For a stationary balloon, numerical simulations show two well-defined flow patterns that depend on the region of the IMO device. Successive increases of the Reynolds number raise the longitudinal velocity without creating secondary flow. This characteristic is not affected by staggered or non-staggered fiber placement within the fiber bundle. For a pulsating balloon, the flow mixing is enhanced by generating a three-dimensional time-dependent flow characterized by oscillatory radial, pulsatile longitudinal, and both oscillatory and random tangential velocities. This three-dimensional flow increases the flow mixing due to an active time-dependent secondary flow, particularly around the fibers. Analytical models show the fiber bundle placement effect on the pressure gradient and flow pattern. The oxygen transport from the fiber surface to the mean flow is due to a dominant radial diffusion mechanism, for the stationary balloon. The oxygen transfer rate reaches an asymptotic behavior at relatively low Reynolds numbers. For a pulsating balloon, the time-dependent oxygen-concentration field resembles the oscillatory and wavy nature of the time-dependent flow. Sherwood number evaluations demonstrate that balloon pulsations enhance the oxygen transfer rate, even for smaller flow rates.

Visualization of Parameter Sensitivity of 2D Time-Dependent Flow

2018 ◽  
pp. 359-370
Author(s):  
Karsten Hanser ◽  
Ole Klein ◽  
Bastian Rieck ◽  
Bettina Wiebe ◽  
Tobias Selz ◽  
...  
Keyword(s):  
Parameter Sensitivity ◽  
Time Dependent ◽  
Dependent Flow

TRANSIENT HYDROMAGNETIC FLOW OF A VISCOUS FLUID

2011 ◽  
Vol 25 (19) ◽  
pp. 2533-2542
Author(s):  
T. HAYAT ◽  
S. N. NEOSSI NGUETCHUE ◽  
F. M. MAHOMED
Keyword(s):  
Magnetic Field ◽  
Viscous Fluid ◽  
Infinite Plate ◽  
Transverse Magnetic ◽  
Time Dependent ◽  
Hydromagnetic Flow ◽  
Electrically Conducting ◽  
Dependent Flow ◽  
Arbitrary Velocity ◽  
Numerical Approaches

This investigation deals with the time-dependent flow of an incompressible viscous fluid bounded by an infinite plate. The fluid is electrically conducting under the influence of a transverse magnetic field. The plate moves with a time dependent velocity in its own plane. Both fluid and plate exhibit rigid body rotation with a constant angular velocity. The solutions for arbitrary velocity and magnetic field is presented through similarity and numerical approaches. It is found that rotation induces oscillations in the flow.

Sign in / Sign up

Export Citation Format

Share Document