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Conversion formula for viscosity

Conversion formula for viscosity

Conversion formula for viscosity

(OP)
Hello,

 Can anyone give the conversion formula for viscosity - I need to convert Saybolt Second (SSU) to centi Stokes (cSt)? The actual value required is 100 SSU in cSt.

 I found some tables on the internet which give the conversion for selected values and also the following formula

 SSU = 4.55 * cSt, if cSt > 50.

 I would greatly appreciate if there is any analytical expression for this conversion.

Thanks in advance.

RE: Conversion formula for viscosity

Per Juvenal:
k.v. = 0.22 * S – 180/S
Where
k.v. is in cSt
S is in SUS

If you're dealing with anything above 100 SSU ~ 200cSt, the formula simplifies to k.v. ~ 0.22*S

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RE: Conversion formula for viscosity

Some parantheses for clarification:
k.v. = (0.22*S) – (180/S)

=====================================
Eng-tips forums: The best place on the web for engineering discussions.

RE: Conversion formula for viscosity

Typo correction:
"If you're dealing with anything above 100 SSU ~ 20cSt, the formula simplifies to k.v. ~ 0.22*S"

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Eng-tips forums: The best place on the web for engineering discussions.

RE: Conversion formula for viscosity

(OP)
electricpete,
 thanks for the equation. the simplified equation you have mentioned k.v. ~ 0.22*S is the same as the ones I found at many websites and mentioned in the original post but in reverse as S = 4.55*k.v.

I was looking for a more general formula applicable over a wider range and I think I can you the one without simplification.

thanks.

RE: Conversion formula for viscosity


You may use:

cS = 0.226 S - 195÷S for S < 100

cS = 0.22 S - 135÷S for S > 100

where S = SSU

RE: Conversion formula for viscosity

(OP)
thank you 23562

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