# Rheology Question

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 August 7, 2003, 04:12 Rheology Question #1 JamCam Guest   Posts: n/a Sorry, but this question is not related to CFD, but I know this forum can be very helpful. To calculate K, the consistency factor for Power Law fluids from shear stress (Dynes/cm2) and shear rate (sec-1) readings, you use this equation: K = 100*shear stress @ 300rpm / shear rate @ 300 rpm^n n = the Power Law exponent This gives K in centipoise. I see many people use eq. cp or Pa.s^n. What are these units?! How can I convert centipoise to eq.cp or Pa.s^n Any help gratefully appreciated! JC

 August 7, 2003, 05:47 Re: Rheology Question #2 Tom Guest   Posts: n/a Hi, If you visit www.efluids.com you will find a Unit Conversion Calculator. Perhaps that is helpful. Tom

 August 7, 2003, 06:13 Re: Rheology Question #3 JamCam Guest   Posts: n/a Thanks for the reply, unfortunately I've tried many a conversion calculator, with no mention of eq. cp or Pa.s^n. I'm sursprised at the lack of information in books and on the web about this. I just need something that explains the difference to me! JC

 August 7, 2003, 06:46 Re: Rheology Question #4 Andreas Guest   Posts: n/a Hi Jam As far as I know, centipoise (cPs) is an obsolet unit for viscosity. 1 Pa*s = 1000 centipoise Bye Andreas

 August 7, 2003, 06:57 Re: Rheology Question #5 JamCam Guest   Posts: n/a Thanks, I know centipoise is a bit obsolete, the preferred SI unit is indeed Pa.s (the same as N.s.m2 and kg.m.s). It's when we're dealing with consistency factor K and flow behaviour index, n that eq.cp or Pa.s^n appears. It has something to do with this, but I don't know what! For online conversion, you can't beat this site: http://www.ex.ac.uk/cimt/dictunit/dictunit.htm but there's no mention of what I'm after here! JC

 August 11, 2003, 08:01 Re: Rheology Question #6 Pete Guest   Posts: n/a You'll be surprised how much we use centipoise in industry!

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