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Related Concept Videos

Rapidly Varying Flow01:24

Rapidly Varying Flow

34
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...
34
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 Through a Fire Extinguisher01:12

Design Example: Flow Through a Fire Extinguisher

91
A fire extinguisher that uses pressurized water relies on fluid dynamics principles to generate a high-velocity stream capable of suppressing flames. The water is stored at a much higher pressure inside the extinguisher than the surrounding atmosphere. This pressure difference forces the water to flow rapidly when the extinguisher is activated, and the behavior of the water as it exits the nozzle can be understood using fundamental equations of fluid dynamics.
The key to understanding how the...
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General External Flow Characteristics01:26

General External Flow Characteristics

53
The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
53
Underflow Gates01:30

Underflow Gates

28
Underflow gates are vital for controlling water flow in irrigation canals. The three main types of underflow gates — vertical, radial, and drum gates — serve different purposes while ensuring effective flow management. Vertical gates move up and down, generating a free-flowing water jet; radial gates pivot to regulate the flow; and drum gates rotate for precise adjustments. The flow through these gates is influenced by downstream conditions, resulting in free or drowned outflow.Free and...
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Free Jet01:14

Free Jet

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Free jets describe the flow of liquid exiting a reservoir through an opening into the atmosphere without resistance. The velocity (v) of the liquid jet is derived using Bernoulli's principle and expressed as:
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Related Experiment Video

Updated: May 13, 2025

A Flow-through Exposure System for Evaluating Suspended Sediments Effects on Aquatic Life
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The FRED-X Flow Diverter-An Australian Experience.

Peter Shuangyue Tan1,2, Charles Li3, Cameron Williams1

  • 1Department of Interventional Neuroradiology, Alfred Hospital, Melbourne, Victoria, Australia.

Journal of Medical Imaging and Radiation Oncology
|April 14, 2025
PubMed
Summary

The FRED X flow diverter shows good safety and effectiveness for treating brain aneurysms in Australia. Its antithrombotic coating may reduce clot complications, but more research is needed.

Keywords:
FRED‐Xendovascularflow diverting stentintracranial aneurysmneurointervention

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Area of Science:

  • Neuroendovascular therapy
  • Medical device technology
  • Cerebrovascular disease management

Background:

  • The FRED X flow diverter incorporates an antithrombotic surface treatment to mitigate thrombogenicity.
  • Intracranial aneurysms pose significant risks, necessitating effective treatment strategies.

Purpose of the Study:

  • To evaluate the safety and efficacy of the FRED X flow diverter for treating intracranial aneurysms.
  • To assess outcomes in the Australian neurovascular context.

Main Methods:

  • Retrospective review of clinical, procedural, and imaging data from a single Australian center.
  • Inclusion of 39 patients with 52 aneurysms treated between June 2021 and September 2024.
  • Follow-up imaging utilizing MRA and IV-DSA.

Main Results:

  • High technical success with 98% satisfactory wall apposition.
  • Complete aneurysm occlusion achieved in 74% of cases at median 28-week follow-up; 86% had adequate occlusion (> 90%).
  • Low rates of thrombotic complications (rare) and adverse events (10% minor, 5% major); 5% mortality in ruptured cases.

Conclusions:

  • FRED X demonstrates favorable safety and efficacy for intracranial aneurysm treatment in Australia.
  • High occlusion rates and rare thrombotic events suggest potential benefits of the antithrombotic coating.
  • Further large-scale studies with extended follow-up are warranted to confirm these findings.