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Evacuated Canister and Flow Rate 
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#1
Mar1313, 09:45 AM

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Hello everyone, I am currently in a mechanical engineering program, and I am on my first coop 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 2436 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). Thanks! 


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