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Power-User

Join Date: Feb 2007
Location: Aberdeen, Scotland
Posts: 392

# 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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Associate

Join Date: Dec 2006
Location: Manchester - England
Posts: 30
#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)

Power-User

Join Date: Feb 2007
Location: Aberdeen, Scotland
Posts: 392
#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?

Active Contributor

Join Date: Apr 2009
Posts: 18
#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)