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We have a vacuum suctioning air out of test model through a feeding tube using a valve. The valve's outlet is connected to a tube which is connected to a feeding tube. Between the feeding tube and the larger tube (connected directly to the valve) is a catch for fluids. The feeding tube has several holes at the end of it. I am trying to understand how I can calculate the pressure within each component (the feeding tube with the holes, the catch for the fluids, and the larger tube connected directly to the valve. I took fluid mechanics a long time ago and I do not remember how to do this. Thanks!
If you need pressure, that is the easiest variable to measure. Get Vacuum guages and connect them anywhere you can on your system. Get one right before the pump and put one on your test model, if possible.
Look for a pump curve for your vacuum pump. Sorry, I am not familiar with vacuum pumps, but they should have pump curves available and a way to calculate the flow based on the vacuum pressure just before the pump. Once you know the flow rate in the tube, you can use the diameter of the tube to find the speed of the fluid in each section. The smaller the tube, the faster the flow and the greater is the friction loss.
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