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Unread 05-08-2011, 02:03
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Gas Flow (Help with Physics needed)

One year of high school physics and several attempts at Googling have failed me. Chief Delphi? I need your help.

There are two closed containers, each holding different amounts of the same gas at different pressures. The two systems are opened to each other. I am looking for an/the equation that models the rate of flow (change in mass/time) from one container to the other.

The solution I'm seeking is to calculate how long it will take for one container to reach a certain psi. After finding the rate of flow, it's pretty simple to calculate the (change in pressure/time) which can then be integrated for change in pressure. Then, it's just a matter of solving.

I assume that the closer the pressures, the slower the rate will be. Is there already an equation for (change in pressure/time)? Does the area of the opening matter? Am I wrong anywhere in the above post?

Anyone?
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