Physics Help Forum Air flow over a U-Tube

 Thermodynamics and Fluid Mechanics Thermodynamics and Fluid Mechanics Physics Help Forum

Nov 24th 2015, 01:26 PM   #1
Junior Member

Join Date: Nov 2015
Posts: 3
Air flow over a U-Tube

Hello!

I attached a problem I'm working on for class.

My solution: Look at Bernoulli's equation which is a constant so

Pressure(a) + 1/2 density v(a)^2 +density g h = Pressure(b) + 1/2 density v(b)^2 +density g h

Because b's velocity is greater, a's pressure has to be greater to make the equation equal. Because a's pressure is greater, the force is greater, so the water would rise on a's side and lower on b's side.

Does that seem right?
Attached Files
 Physics Help.pdf (218.6 KB, 3 views)

Last edited by beika; Nov 24th 2015 at 01:30 PM.

 Nov 24th 2015, 02:09 PM #2 Senior Member     Join Date: Apr 2008 Location: Bedford, England Posts: 668 Your reasoning is correct, but your answer is wrong! As you correctly deduced the higher velocity at "b" implies that the air pressure at "a" will be greater than the air pressure at "b". This means the air pressure pushing down on the water at "a" is greater than the air pressure pushing the water down at "b" So the water at "a" will be pushed down more than the water at "b"... __________________ You have GOT to Laugh ! Last edited by MBW; Nov 24th 2015 at 02:11 PM.
 Nov 24th 2015, 03:20 PM #3 Junior Member   Join Date: Nov 2015 Posts: 3 Oh thank you!

 Tags air, flow, utube

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