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Related Experiment Videos

Classification of pulsating flow patterns in curved pipes

S Tada1, S Oshima, R Yamane

  • 1Department of Mechanical Engineering and Science, Tokyo Institute of Technology, Japan.

Journal of Biomechanical Engineering
|August 1, 1996
PubMed
Summary

Numerical simulations reveal how fluid flow in coiled pipes changes with Womersley number (Wo) and Dean number (De). Secondary flow patterns shift from viscosity-dominated to inertia- or convection-dominated as these parameters increase.

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Area of Science:

  • Fluid dynamics
  • Computational fluid dynamics
  • Non-Newtonian fluid mechanics

Background:

  • Understanding fluid behavior in curved pipes is crucial for various engineering applications.
  • Laminar flow in coiled pipes exhibits complex secondary flow patterns influenced by multiple parameters.
  • Previous studies have explored aspects of this flow, but a comprehensive analysis across a wide parameter range is needed.

Purpose of the Study:

  • To numerically simulate and analyze the fully developed periodic laminar flow of incompressible Newtonian fluids in a circular pipe coiled into a circle.
  • To investigate the influence of Womersley number (Wo), Dean number (De), and amplitude ratio (beta) on flow patterns.
  • To classify secondary flow patterns and understand their evolution with changing flow parameters.

Main Methods:

Related Experiment Videos

  • Numerical simulation of periodic laminar flow in a coiled circular pipe.
  • Parametric study varying Womersley number (2.19-50.00), Dean number (15.07-265.49), and amplitude ratio (0.50-2.00).
  • Fixed curvature ratio (delta) at 0.05.

Main Results:

  • Secondary flow patterns were classified into viscosity-dominated, inertia-dominated, and convection-dominated types.
  • The evolution of secondary flow with increasing Womersley and Dean numbers was elucidated.
  • At high Dean numbers with an amplitude ratio of 1.0, four to six secondary flow vortices were observed.
  • Lyne-type flow patterns were found to disappear at amplitude ratios greater than or equal to 0.50.

Conclusions:

  • The study provides a detailed characterization of laminar flow in coiled pipes under various conditions.
  • The findings offer insights into the complex interplay of inertial, viscous, and convective forces governing secondary flows.
  • This research contributes to the predictive understanding of fluid dynamics in curved geometries relevant to industrial processes.