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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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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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Gradually Varying Flow01:29

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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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Plane Potential Flows01:23

Plane Potential Flows

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Plane potential flows simplify fluid motion by assuming the fluid to be irrotational and incompressible. These characteristics allow these flows to be described by a velocity potential function, ϕ, representing the flow speed in a given direction, and a stream function, ψ, that visualizes the flow path, both governed by Laplace's equation. These parameters help in estimating flow patterns, velocity distributions, and pressure fields around various hydraulic structures.
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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Updated: Sep 28, 2025

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
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Novel Innovation in Flow Diversion: Surface Modifications.

Joseph S Hudson1, Michael J Lang2, Bradley A Gross2

  • 1Department of Neurosurgery, University of Pittsburgh Medical Center, 200 Lothrop Street, Pittsburgh, PA, USA. Electronic address: https://twitter.com/js_hudson.

Neurosurgery Clinics of North America
|March 29, 2022
PubMed
Summary
This summary is machine-generated.

Surface-modified flow diverters for aneurysm treatment show promising results, offering comparable efficacy to traditional devices with potentially reduced complications like in-stent thrombosis and ischemia.

Keywords:
Flow diversionIntracranial aneurysmStentSub-arachnoid hemorrhage

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Area of Science:

  • Biomaterials Science
  • Endovascular Surgery
  • Medical Device Technology

Background:

  • Flow diversion is a key endovascular technique for treating brain aneurysms.
  • Traditional flow diverters carry risks of in-stent thrombosis and necessitate dual antiplatelet therapy.
  • Surface modification of flow diverters aims to mitigate these complications.

Purpose of the Study:

  • To review the clinical data and efficacy of surface-modified flow diverters.
  • To explore alternative bioactive surface modification strategies for aneurysm treatment.

Main Methods:

  • Review of preliminary follow-up data for commercially available surface-modified flow diverters.
  • Discussion of in vitro and in vivo studies on alternative bioactive surface modification strategies.

Main Results:

  • Surface-modified flow diverters demonstrate noninferiority in angiographic occlusion rates.
  • These devices appear to have lower rates of stent-related ischemia compared to traditional devices.

Conclusions:

  • Surface-modified flow diverters represent a safe and effective advancement in endovascular aneurysm treatment.
  • Alternative bioactive strategies show potential for future improvements in flow diverter technology.