Posted by: koler69 ®
06/08/2006, 10:36:38
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I am sucking in a material of density around 200 lb/ft3 into a vacuum chamber. One inlet and one exit. I am trying to determine the cfm of air required for the pump connected to the outlet. The mass flow of the incoming material that has a density(200lb/ft3) is 5lb/s. I modeled the inlet pipe and vacuum chamber as a control volume to get the velocity of the incoming material using the bernoulli eqn. This gave me a vacuum pressure of 3.4psia/175torr. Then I did the same for the outlet pipe/pump and the vacuum chamber. Used the inside vacuum pressure I found and made the outside pressure that the pump released to 0. My pump cfm is amazingly high and is totally wrong. Im getting a cfm of air required for the pump to make of like 3000-4000. Any help or questions?
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