Fall 2012 ME 395 - GSI Josh Lacey

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 g(z1-z2) term

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Esther C



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Join date : 2012-09-12

PostSubject: g(z1-z2) term   Tue Nov 27, 2012 5:21 pm

I'm not feeling confident in making the argument that the g*delta_z term in the energy equation can be neglected. Unfortunately, we did not measure the height difference between the pressure measurements in lab. However, if 4 inches is a good estimate, that term adds about 1 J/kg to the energy rise. My energy rise values range from about 20 to 1500, so this term feels not quite negligible at the low end, and it's an easy constant to add in.
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Esther C



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Join date : 2012-09-12

PostSubject: Re: g(z1-z2) term   Tue Nov 27, 2012 5:28 pm

Woops, I actually threw out the data that corresponded to that low end anyway, so I guess I really am looking at <1% of the energy rise. In fluids I remember that the 'ro g h' terms were negligible for air but not liquids, so that's consistent.

It'd still be wonderful if I could know what that height difference is just for my argument in the report.
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GSI Overlord
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Join date : 2012-08-30

PostSubject: Re: g(z1-z2) term   Tue Nov 27, 2012 6:35 pm

I think 110 mm is a pretty good estimate for the height.
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