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Flow Calc Equations for Small lumens

Flow Calc Equations for Small lumens

Flow Calc Equations for Small lumens

(OP)
I am designing a cardiology catheter that pumps fluid through very small lumens.  They are on the range of 0.25-1.0 mm diam.  I found a derivation of Poiselle's law for a min tapered tube, but I don't think that it is giving me answers that match experimental flows/pressures and I wondered if anyone knew of a better equation with better agreement to real life flows with these small lumens.     

RE: Flow Calc Equations for Small lumens

The Flow of Complex Mixtures in Pipes is a very good book but I don't think it has too much on capillary flow.
 
Do a search on capillary tube, flow equations, catheter.  You should be able to find somthing to help you.

Here's one hit: http://www.fys.uio.no/~eaker/thesis/node11.html

RE: Flow Calc Equations for Small lumens

The book covers laminar flow and Bingham fluids, both of which are directly on point.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Flow Calc Equations for Small lumens

MikeHalloran,
Your point is well taken, although, the OP did not specify the type of fluid.  It could be blood, angiographic dye, saline, et. c.  The price of $190 is kind of steep to pay for a book that may or may not be helpful when there are so many publications that deal specifically with capillary flow in catheters.  

Anyway, thanks for reminding me. Bingham gives an excellent treatment of capillary flow. See the attached publication:
http://books.google.com/books?id=TGM6AAAAMAAJ&printsec=frontcover&dq=Bingham&as_brr=1#v=onepage&q=&f=false
 

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