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Related Concept Videos

Heart Valves01:16

Heart Valves

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The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
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Blood Flow01:29

Blood Flow

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Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
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Steady Flow of a Fluid Stream01:27

Steady Flow of a Fluid Stream

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Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
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Gradually Varying Flow01:29

Gradually Varying Flow

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Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
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Design Example: Flow of Oil Through Circular Pipes01:25

Design Example: Flow of Oil Through Circular Pipes

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Understanding fluid flow behavior through pipes is critical in fluid mechanics, especially in applications like oil transportation through pipelines. Hagen-Poiseuille's law provides an exact solution derived from the Navier-Stokes equations for steady, incompressible, and laminar flow within a circular pipe. Hagen-Poiseuille's law helps determine the necessary pressure drop across a pipeline section by determining parameters like pipe length, radius, oil viscosity, and the desired...
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Rapidly Varying Flow01:24

Rapidly Varying Flow

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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Related Experiment Video

Updated: Sep 18, 2025

In vitro Assessment of Aortic Regurgitation Using Four-Dimensional Flow Magnetic Resonance Imaging
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A novel approach to flow visualization through mechanical heart valves.

Dylan Goode1, Ruby Dhaliwal1, Jaymes Schmidt1

  • 1Faculty of Applied Science, School of Engineering, The Heart Valve Performance Laboratory, University of British Columbia, Kelowna, BC, Canada.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|June 26, 2025
PubMed
Summary

A new bileaflet mechanical heart valve (BMHV), the iValve, shows improved flow dynamics and reduced disturbances. This innovative design may reduce or eliminate the need for lifelong anticoagulation therapy in patients with valvular disease.

Keywords:
Heart valveaortic valvescardiovascular engineeringflow visualizationheart simulatorsmedical devicesprosthetic heart valvessimulation

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Research
  • Medical Device Innovation

Background:

  • Mechanical heart valves (MHVs) are crucial for valvular disease but have limitations.
  • Current MHVs often lack native valve hemodynamic efficiency and require anticoagulation.
  • Thrombus formation remains a significant risk with existing MHVs.

Purpose of the Study:

  • To introduce and evaluate a novel bileaflet mechanical heart valve (BMHV), the iValve.
  • To assess the iValve's hemodynamic performance compared to conventional BMHVs.
  • To investigate the potential of the iValve to reduce or eliminate anticoagulation therapy.

Main Methods:

  • Development of a custom-built steady-state flow simulator for MHV visualization.
  • Comparative flow analysis of the iValve against SJM/Abbott Regent and On-X valves.
  • Detailed observation of flow patterns in critical central flow and hinge regions.

Main Results:

  • The iValve demonstrated significantly reduced flow disturbances and vortex formation.
  • Effective hinge washing was observed in the iValve during forward flow.
  • The iValve design appears to minimize energy loss and shear stress on blood elements.

Conclusions:

  • The iValve exhibits promising hemodynamic characteristics compared to conventional BMHVs.
  • The novel steady-state flow simulator provides valuable insights into MHV flow dynamics.
  • Further research, including pulsatile flow and in vivo studies, is warranted to validate the iValve's clinical potential.