- #1
dom_quixote
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Are these hydrodynamic effects the same?
Hydrodynamics Effects: Are They the Same?
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In summary, the two discussed hydrodynamic effects, the Coanda effect and ram pressure, are different phenomena. The Coanda effect involves a parallel flow that remains attached due to fluid viscosity and velocity variation in the boundary layer, while ram pressure involves a perpendicular flow that creates pressure due to unbalanced kinetic energy. In a separate experiment, the speaker observed a similar "sucking" effect between a hose nozzle and a flat lid, which is caused by the Bernoulli effect. This effect is due to the difference in fluid velocity between the bottom and top of the hose nozzle.
- #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
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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
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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
FAQ: Hydrodynamics Effects: Are They the Same?
What is hydrodynamics?
Hydrodynamics is the branch of physics that studies the motion of fluids (liquids and gases) and the forces acting on them. It is a sub-discipline of fluid dynamics and is concerned with understanding how fluids move and interact with their surroundings.
Are hydrodynamic effects the same in all fluids?
No, hydrodynamic effects are not the same in all fluids. They depend on several factors including the fluid's viscosity, density, and compressibility. Different fluids exhibit different behaviors under similar conditions due to these varying properties.
How do viscosity and density affect hydrodynamic effects?
Viscosity and density are critical properties that influence hydrodynamic effects. High viscosity fluids resist flow and shear, leading to different flow patterns compared to low viscosity fluids. Density affects the buoyancy and inertia of the fluid, impacting how it responds to forces and moves through different environments.
Can hydrodynamic effects be the same in different scenarios?
Hydrodynamic effects can be similar in different scenarios if the fluids involved have comparable properties and are subjected to similar conditions. However, variations in fluid properties, flow conditions, and external forces typically result in different hydrodynamic behaviors.
What are some practical applications of understanding hydrodynamic effects?
Understanding hydrodynamic effects is crucial in many fields such as engineering, environmental science, and medicine. Applications include designing efficient ship hulls, predicting weather patterns, optimizing industrial fluid processes, and developing medical devices for fluid transport in the human body.
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