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Sizing a goose neck vent

This is one of those random things that came up, through work, where I was surprised to find a relative void of info on the internet: sizing a gooseneck for an aboveground storage tank.

Venting for aboveground storage tanks is dealt with in standards such as API 2000, which gives …

tags: API 2000, venting, compressible flow, fanno flow, pipe flow,

Posted by
selenized
in real world problems
on Sat 18 October 2014

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Visualizing transient laminar pipeflow

In a previous post I derived some equations for the velocity distribution as a function of time in transient pipe flow. Here it is visualized by Sage.

The Sage code is as follows

import mpmath as mp
xi, tau = var('xi tau')
def phi(xi,tau,n):
sum = 0
for …

tags: fluid dynamics, pipe flow,

Posted by
selenized
in math
on Thu 24 July 2014

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Startup of laminar pipe flow

I've spent a fair bit of time examining various kinds of pipe flow, but so far only at steady state. This time I take a kick at the transient flow cat, looking at start-up of laminar pipe flow (Transport Phenomena 4D.2)

Suppose the same old cylindrical coordinates, assuming incompressible …

tags: fluid dynamics, pipe flow,

Posted by
selenized
in math
on Wed 23 July 2014

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Flow through a porous medium, with pipes!

Flow in and around pipes is old hat at this point, so to keep things fresh what about flow through porous medium, into a pipe? (Transport Phenomena 4C.4)

Suppose fluid is coming in through the walls of a pipe, say a ceramic tube with a pressure at the outside …

tags: pipe flow, fluid dynamics,

Posted by
selenized
in math
on Wed 16 July 2014

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Not no-slip -- low density gas flow

Continuing on with tube flow, what happens when the fluid moving through the tube is low density and thus the no-slip boundary condition breaks down? (from 2B.9 Transport Phenomena)

I want the mass flowrate for a low density gas moving through a tube in slip flow.

First off we …

tags: fluid dynamics, pipe flow, compressible flow,

Posted by
selenized
in math
on Mon 28 April 2014

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Liquid in and on pipes

One of the nice things about setting up the math for simple fluid flow problems is that you can recycle the initial bits for various other uses. If you set up a balance based on a particular geometry of a differential volume then a wide variety of possible flow cases …

tags: fluid dynamics, pipe flow,

Posted by
selenized
in math
on Mon 21 April 2014

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Excel trick: circular references

I am not a big fan of using excel for doing complicated engineering calculations. I have spent way too much of my life trying to find the mistake another's convoluted spreadsheet, it is all to easy to make "spaghetti code" in a spreadsheet.

That said I'm now going to talk …

tags: excel, pipe flow,

Posted by
selenized
in hacks and kludges
on Thu 21 March 2013

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