1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Evacuated Canister and Flow Rate

  1. Mar 13, 2013 #1
    Hello everyone, I am currently in a mechanical engineering program, and I am on my first co-op work term. I have been assigned to make modifications to a PVC collection device involving flow rates, but I have not yet taken any courses relative to flow. I was hoping I could get some help and some explanations of the theory involved.

    So I have a PVC canister, with a volume of 1 litre. The canister is evacuated to -26 inches of mercury. The canister is then attached to a series two of plastic tubes to restrict the air flow. The first tube has a inner diameter of 1.58 mm and a length of 60 cm. The second tube has an inner diameter of 0.0635 mm and has a variable length. Then the system is open to normal atmospheric pressure.

    The goal of this apparatus is to collect samples of air over a 24-36 hour time period. I am looking for some way to model this so that I can perform calculations with different volumes/diameters of tube/etc. I am really unsure how to do this as the pressure inside the canister is changing, which would also affect the flow rate (I am assuming).

  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted