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Calculate the flow velocity 
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#1
Jul713, 09:14 AM

P: 30

This might be simple but I can't remember how to do it.
problem: we have 2 tanks. One filled with atmospheric air at 1 bar and the other is vacuum. The two tanks are connected by a rigid pipe which has a valve. I open the valve and air flows to the vacuum tank. How do I calculate the air velocity? P.s: I don't think Bernoulli is valid here because the flow isn't steady I guess. Please state your assumptions clearly. Thanks in advance 


#2
Jul713, 09:37 AM

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P: 1,716

Flow velocity depends on the thickness and length of the pipe, and on the temperature of the air.



#3
Jul713, 11:23 PM

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PF Gold
P: 6,265

Instead of 'thickness' of the pipe, the term 'internal diameter' would be more apt.



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