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Viscosity 5W-30 oil |
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| Sep15-07, 08:06 PM | #1 |
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Viscosity 5W-30 oil
Hi guys,
For a prac we did, we are given the properties of a particular oil. Density (kg/m^3) = 876 Viscosity (Ns/m^2) = 20.0x10^(-3) I believe it is the dynamic viscosity. Now is this viscosity correct? Or should it be 2.0x10^(-3) |
| Sep16-07, 08:20 AM | #2 |
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The units are for dynamic viscosity. Is one given 5W-30?
See these numbers for a synthetic 5W-30 oil which are in kinematic viscosity: ( http://www.lubeoilsales.com/products/XLF.htm ) Kinematic Viscosity @ 100°C, cSt (ASTM D-445) 10.3 Kinematic Viscosity @ 40°C, cSt (ASTM D-445) 50.9 Convert cSt to Pa-s and compare to 20 E-3. The actual viscosity depends on temperature. Also see - http://www.matweb.com/search/Specifi...snum=WEXXON020 for ExxonMobil 5W-30 |
| Sep16-07, 08:40 AM | #3 |
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Kinematic viscosity 10.3 cSt = 10.3 E-6 m^2/s
To convert to kinematic to dynamic viscosity, multiply by the density, Dynamic viscosity = 10.3 E-6 * 876 = 9.02 E-3 Ns/m^2 = 9.02E-3 Pa-s If the dynamic viscosity is 45E-3 Pa-s at 40C and 9E-3 Pa-s at 100C, the correct value for your experiment could be either 20E-3 or 200E-3 depending on the temperature. |
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