calculate the flow velocity


by supernova1387
Tags: bernoulli, fluid, velocity
supernova1387
supernova1387 is offline
#1
Jul7-13, 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
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Baluncore
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#2
Jul7-13, 09:37 AM
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Flow velocity depends on the thickness and length of the pipe, and on the temperature of the air.
SteamKing
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#3
Jul7-13, 11:23 PM
HW Helper
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P: 5,550
Instead of 'thickness' of the pipe, the term 'internal diameter' would be more apt.

boneh3ad
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#4
Jul7-13, 11:51 PM
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P: 1,440

calculate the flow velocity


Also pay attention to the pressures. The flow is going to start off choked but will eventually un-choke as the pressures equalize.


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