Civil engineeringLesson 1 of 1 in the course Hydraulics and water resources

Open-Channel Flow: Classification, Regimes, and Hydraulic Models

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Open-channel flow occurs when liquid moves through a channel with a free surface exposed to the atmosphere. This lesson introduces the defining feature of open-channel flow and explains how it is classified according to changes in time, space, and discharge.

A river, drainage ditch, roadside gutter, or irrigation channel is an example of an open channel. Its liquid has a free surface—an interface between the liquid and the air. In a pipe flowing full, there is no such free surface.

All flashcards

What defines open-channel flow?
Liquid flow in a conduit with a free surface exposed to the atmosphere.
What does the Froude number compare?
Inertial effects with gravitational effects in open-channel flow; Fr=U/gDFr=U/\sqrt{gD}.
What does the Reynolds number indicate?
The relative importance of inertial and viscous effects, associated with laminar, transitional, or turbulent flow.
What does the continuity equation express in open-channel flow?
Mass conservation: changes in channel storage balance changes in discharge along the channel.
When is Manning's equation commonly used in open-channel hydraulics?
As an empirical method for calculating uniform flow.

Quiz questions

  1. What feature distinguishes open-channel flow from flow in a full pipe?Answer: Open-channel flow has a free surface; full-pipe flow does not.
  2. At each location, depth remains constant over time but differs from one channel section to another. How is the flow classified?Answer: Steady and varied.
  3. What effects does the Froude number compare?Answer: Inertial effects with gravitational effects.
  4. What does momentum conservation relate in open-channel flow?Answer: Changes in fluid motion to forces acting on the flow.
  5. For which condition is Manning's equation commonly used as a practical flow-calculation method?Answer: Uniform open-channel flow.

Based on the Wikipedia article Open-channel flow, licensed CC BY-SA 4.0. Adapted into a summary, flashcards and quizzes.

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