Calculating Pressure in Pipes: How to Solve for Unknown Entrance Pressure?

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To calculate the unknown entrance pressure in a pipe, it can be derived from the depth of the tank, with the pressure at the entrance potentially equating to the pressure at the exit. The discussion highlights that if the height (z) is set at 10 m, the pressure at the water surface can be considered as zero, assuming no head loss (hf = 0). Clarification is needed on the reference points for pressure measurement, whether it's from the pipe entry to exit or from the free surface to the pipe exit. Ultimately, understanding the relationship between the tank depth and pressure is crucial for solving the problem. The pressure at the entrance can be calculated using the established principles of fluid mechanics.
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Homework Statement


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in this question , the Pressure at entrance is not given , how to do this?

Homework Equations

The Attempt at a Solution


does the author mean the pressure at entrance = pressure at exit
 
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foo9008 said:

Homework Statement



in this question , the Pressure at entrance is not given ,
You are expected to find it from the depth of the tank.
 
billy_joule said:
You are expected to find it from the depth of the tank.
i am going to use this equation to solve this question , where z = 10 m what is the pressure at ENTRANCE ? it's not given
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p/s : hf = 0
 
It's unclear where the two points on your streamline are.pipe entry and exit? Or free surface and pipe exit?
If z=0 is along the pipe axis then z=10 is the water surface, and the pressure there is equal to the exit pressure so both can be set to zero.
 

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