Water Flow Discharge: Is My Thinking Correct?

[pragmaticindulgence]

I've got two tubes filled with liquid, their both of equal diameters, the first one is straight up and down about 20 feet long, the other is 100 feet long but is spiraled like on a spool, since the straight tube has a higher fall than the spiral, I would assume that the straight tube would have more pressure.
Is my thinking correct?

 

[Q_Goest]

Hi Pragmatic. Yes, your answer is correct. If there is no flow in the tubes (the fluid is static) then the only thing pressure at the bottom of the tube is dependant on is "head" or the height of the fluid. It is also independant of the diameter, length and shape of the tube. Pressure at the bottom is simply the density times gravity times height plus whatever pressure there is at the top of the fluid, it's that simple.

 

[FredGarvin]

What pressure are you referring to? The static pressure at the bottom of the tube? Are the tops and bottoms of the tubes at the same heights? Are both tubes filled with the same liquid to the same level?

 

[pragmaticindulgence]

Perhaps pressure is not the right discription, I should of probably said force?
The spiral is lower, but both are even at the bottom.
Both have water, but the spiral since it is 100 foot long it would have that much more water.

 

[FredGarvin]

No. Pressure is the correct term. After what you have mentioned, Q's reply is the appropriate one. As he mentioned, the pressure head is going to be only dependent on the height of the water, not the amount.

 

[pragmaticindulgence]

thanks, may have another question on
this later.