Dynamic Viscosity

3 comments

MACA Power-User Join Date: Feb 2007 Location: Aberdeen, Scotland Posts: 392 Good Answers: 21	Dynamic Viscosity 07/21/2009 10:09 AM
	Can anyone confirm my calculation. I need to know the dynamic viscosity of Castrol Transaqua HT2 at 20 degrees C. Density = 1.063g/ml Kinematic viscosity = 4.4cSt I get a value of 4677mPa.s However I have a flowmeter pressure drop graph and the highest value this goes to is 3000mPa.s Does 4677mPa.s sound like a reasonable value or have I made a mistake?
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tesser Associate Join Date: Dec 2006 Location: Manchester - England Posts: 30 Good Answers: 3	#1 Re: Dynamic Viscosity 07/22/2009 4:37 AM
	centistokes = centipoise divided by specific gravity so centipoise = mPa.s = centistokes multiplied by SG = 4.4 x 1.063 = 4.6772 cPs (mPa.s)
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MACA Power-User Join Date: Feb 2007 Location: Aberdeen, Scotland Posts: 392 Good Answers: 21	#2 Re: Dynamic Viscosity 07/22/2009 9:22 AM
	Having looked again through fresh eyes I agree with the 4.677 mPa.s. Still not sure whats going on though as someone told me today that a typical value would be 200,300,400 mPa.s. The graph I've got in front of me also only goes from 30-3000 mPa.s. Anyone got ideas as to what the mistake is in this?
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Rheolog Active Contributor Join Date: Apr 2009 Posts: 18 Good Answers: 1	#3 Re: Dynamic Viscosity 07/22/2009 9:51 AM
	I don't think there is any mistake. Your calculation is correct, the dynamic viscosity is 4.677 mPa s. This is a water based fluid so I am not surprise by the low viscosity (water = 1 mPa s)
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