- #1
dom_quixote
- 52
- 9
Are these hydrodynamic effects the same?
Hydrodynamics Effects: Are They the Same?
- Context: High School
- Thread starter dom_quixote
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- Effects Hydrodynamics
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Discussion Overview
The discussion revolves around the comparison of different hydrodynamic effects, specifically the Coanda effect and ram pressure, and whether they can be considered the same phenomenon. Participants explore their characteristics and implications in various experimental contexts.
Discussion Character
- Debate/contested
- Experimental/applied
Main Points Raised
- One participant asserts that the Coanda effect and ram pressure are different, describing the Coanda effect as involving flow parallel to a surface and the ram pressure as perpendicular flow providing pressure due to unbalanced kinetic energy.
- Another participant describes an experiment involving a bucket and a hose nozzle, questioning whether the observed "sucking in" effect relates to ram pressure.
- A later reply references the Bernoulli effect to explain a phenomenon observed between the hose end and a flat lid, suggesting that fluid velocity differences contribute to the observed behavior.
Areas of Agreement / Disagreement
Participants do not reach a consensus on whether the effects are the same, with differing views presented on the nature of the phenomena involved.
Contextual Notes
Participants mention the need for clarity on the specific processes being observed, indicating that assumptions about the phenomena may vary. There is also a reference to the difficulty of observing certain effects in experimental setups.
- #2
Baluncore
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No, they are different effects.
Coanda effect; https://en.wikipedia.org/wiki/Coandă_effect
Ram pressure; https://en.wikipedia.org/wiki/Ram_pressure
In one, the flow is parallel to the surface and remains attached due to fluid viscosity and the velocity variation in the boundary layer.
In the other, the flow is perpendicular and provides a pressure due to unbalanced kinetic energy; KE = ½·m·v² .
Maybe you are seeing some other phenomenon. You need to explain the process you are referring to, or observing, in each case.
Coanda effect; https://en.wikipedia.org/wiki/Coandă_effect
Ram pressure; https://en.wikipedia.org/wiki/Ram_pressure
In one, the flow is parallel to the surface and remains attached due to fluid viscosity and the velocity variation in the boundary layer.
In the other, the flow is perpendicular and provides a pressure due to unbalanced kinetic energy; KE = ½·m·v² .
Maybe you are seeing some other phenomenon. You need to explain the process you are referring to, or observing, in each case.
- #3
dom_quixote
- 52
- 9
Thanks Baluncore!
I did a variation of the second experiment with a bucket. I did not film the experiment due to the difficulty of observing the phenomenon. However, the hose nozzle is also "sucked in" even when the water level rises. Would it be the same effect "RAM Pressure"?
I did a variation of the second experiment with a bucket. I did not film the experiment due to the difficulty of observing the phenomenon. However, the hose nozzle is also "sucked in" even when the water level rises. Would it be the same effect "RAM Pressure"?
- #4
Lnewqban
Homework Helper
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Then, for the second part of the video you were referring to the sucking effect between hose end and flat lid.dom_quixote said:
This happens because the Bernoulli effect, as the fluid velocity under the hose nozzle is greater than the one above.
Please, see:
https://en.wikipedia.org/wiki/Bernoulli's_principle
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