A question about fluids and tubes

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In summary, the conversation discussed an experiment in which water was siphoned through a rubber tube from a graduated cylinder elevated a certain distance from the ground. The teacher modified a similar experiment using Torricelli's Law and basic kinematics to calculate the horizontal distance traveled. However, when using the same equations with the height of the tube above the opening, the calculated distance was much greater than the actual distance. The conversation also touched on the difference between flow through a tube and flow through an orifice.
  • #1
RMalayappan
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My physics teacher cooked up an experiment today on the fly where we tried to calculate the horizontal distance traveled, D, from a rubber tube through which water was siphoned from a graduated cylinder elevated a certain distance H from the ground:
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He modified an experiment he had found of the same sort but with a hole in the cylinder instead, in which case he could use Torricelli's Law to find that [itex]v=sqrt(2gh)[/itex] for water exiting with the surface a distance of h above the hole and basic kinematics to find the horizontal distance upon impact with the ground. We tried the same equations with h being the height of the tube above the opening and the calculations gave a distance that was much farther than the actual distance. What is the proper way to go about this problem and why did the application of the same equations give such a gross overshoot?
 
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  • #2
RMalayappan said:
tube through which water was siphoned
How does flow through a tube differ from flow through an orifice?
 
  • #3
RMalayappan said:
We tried the same equations with h being the height of the tube above the opening and the calculations gave a distance that was much farther than the actual distance
So what you are saying is that if you move the top curve of the siphon higher or lower, using the "same equations" the distance d should vary?
Seems that you have forgotten something about the hose.
 
  • #4
Evidently I have forgotten something, but I don't know what it is. I'm not exactly sure what is different between flow out of an orifice and a tube.
 

What are fluids and tubes?

Fluids are substances that can flow and take on the shape of their container, such as water and air. Tubes are cylindrical structures that are used to transport fluids, like pipes and blood vessels.

How do fluids move through tubes?

Fluids move through tubes due to a concept called pressure. When there is a difference in pressure between two ends of a tube, the fluid will move from the area of high pressure to the area of low pressure.

What is the importance of understanding fluids and tubes?

Understanding fluids and tubes is crucial in various fields, such as engineering, medicine, and environmental science. It helps us design and optimize systems that involve fluid flow, such as pipelines and blood vessels, and also explains many natural phenomena, such as ocean currents and weather patterns.

What factors affect fluid flow through tubes?

The factors that affect fluid flow through tubes include the diameter of the tube, the length of the tube, the type of fluid, the viscosity of the fluid, and the pressure difference between the ends of the tube.

How is fluid flow through tubes measured?

Fluid flow through tubes is measured using various techniques, such as flow meters, pressure gauges, and velocity sensors. These instruments help determine the rate of flow, pressure, and velocity of the fluid, which are essential parameters in understanding fluid behavior in tubes.

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