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Sudden Pipe Contraction - Check my work!

Sudden Pipe Contraction - Check my work!

RE: Sudden Pipe Contraction - Check my work!

You know there is an infinite number of solutions, right? Assume a D2, and calculate L, or vice versa. I read your companion post too. You will need the viscosity of the ATF. Is this homework?

Good luck,
Latexman

Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers

RE: Sudden Pipe Contraction - Check my work!

(OP)
Yes, I ran simulation on a pipe flow simulator, but since I am not familiar with the program I am trying to prove the results. I got a pill length of 0.375" with ID of 0.0286076" or a pill length of 0.25" with ID of 0.026588"

Kinematic viscosity @ 100oC = 7.4 cSt

This is a very small part of a design project for nuclear plant turbines. Not homework.

RE: Sudden Pipe Contraction - Check my work!

Did you mean to draw P2 upstream of the exit? My initial thought was P2 would be just downstream of the nozzle exit. I.e. an exit loss would apply.

Good luck,
Latexman

Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers

RE: Sudden Pipe Contraction - Check my work!

(OP)
State 1 is entrance parameters
State 2 is exit parameter. There is a 125 psi pressure drop wherein the exit of the nozzle is vented to atmosphere.

RE: Sudden Pipe Contraction - Check my work!

I get about the same results as you IF the exit loss is excluded. If exit loss is included, total dP is 1.67 times higher in the 0.0286076" dia. case. I used a full entrance and exit (K = 1.5) and the frictional loss of the nozzle.

Good luck,
Latexman

Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers

RE: Sudden Pipe Contraction - Check my work!

(OP)
Are you using a simulator? I would really like to figure out how to mathematically prove it so that I can put it all into excel and interchange difference D2's and L's.

RE: Sudden Pipe Contraction - Check my work!

I'm using my handy dandy Excel spreadsheet. The basis for my spreadsheet is Crane's Technical Paper No. 410.

Good luck,
Latexman

Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers

RE: Sudden Pipe Contraction - Check my work!

(OP)
Unfamiliar with Crane's Technical Paper #410. Will take a look. Mind sharing the formulas/spreadsheet used to come up with the results? Would rather not continue beating my head against the wall..

RE: Sudden Pipe Contraction - Check my work!

Sorry, I don't share my tools. There's lots of calculators out on the web though. Crane has one.

Good luck,
Latexman

Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers

RE: Sudden Pipe Contraction - Check my work!

Rahleigh, Crane's Technical Paper 410 is relatively cheap ($60 or so) and well worth the money. You will probably find a copy in your technical library or that someone in your workplace has it. If someone does, they might be willing to share it, if you ask nicely.

I really recommend spending the money and getting a copy. I actually own both the English and metric versions. If you're doing nuclear work in the USA, referencing Crane is going to go over better with the NRC than a reference to free website as the source for your equations.

Want to know the do's and don'ts of Eng-Tips? Read FAQ731-376: Eng-Tips.com Forum Policies.
English not your native language? Looking for some help in getting your question across to others or understanding their answers? Go to forum1529: Translation Assistance for Engineers.

RE: Sudden Pipe Contraction - Check my work!

Rahleigh,
I'll second EnergyMix recommendation and state that you can purchase, read, and prepare the XL workbook within a day using the Crane TP410 reference. It'll be the best medicine to cure the "beating my head on the wall" illness.

Good luck!
-pmover

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