I used the Andrade correlation method/calculator to calculate the viscosity of couple of oils at 0C (32F).
Refer to the links below for the calculator and Andrade correlation method.
plugged in data from the following 2 oils (same brand). Nothing specific about these oils just that I currently have the 10W in the garage. both are full synthetic. Was just curious about 0W viscosity near freezing ...
Data from the oil company:
Oil 1 - 10W30: KV100 = 11.60 , KV40 = 71.54
Oil 2 - 0W30: KV100 = 12.18 , KV40 = 73.21
Note: Oil #2 is A3/B4
Calculated viscosity at 0C (32F) is:
Oil 1 : 657.35 cSt
Oil 2 : 637.60 cSt
Calculated viscosity at -17.78C (0F) is:
Oil 1 : 2879.79 cSt
Oil 2 : 2667.69 cSt
Not a huge viscosity diff between a 0W A3/B4 and a 10W30 at freezing 0C (32F).
Q:
is this a very accurate method to estimate or calculate the viscosity? Any other method you guys use?
viscosity calculator:
Viscosity calculator
info from the above web site:
"Calculate the viscosity at a given temperature, when the viscosity is known at two temperatures. The viscosity of a liquid as a function of temperature can be approximated with the Andrade correlation. Given two known temperature-viscosity points, the viscosity of a liquid can be calculated for a target temperature. Lubricating oil producers normally publish the viscosity of their products at two different temperatures.
...
The calculator can be a useful tool for predicting viscosity at a target temperature, but keep in mind that in real world applications a theoretical viscosity value should always be verified with a viscosimeter."
Additional info from petrowiki:
Oil Viscosity
"Andrade's method is based on the observation that the logarithm of viscosity plotted vs. reciprocal absolute temperature forms a linear relationship from somewhat above the normal boiling point to near the freezing point of the oil, as Fig. 6 shows. ..."
Refer to the links below for the calculator and Andrade correlation method.
plugged in data from the following 2 oils (same brand). Nothing specific about these oils just that I currently have the 10W in the garage. both are full synthetic. Was just curious about 0W viscosity near freezing ...
Data from the oil company:
Oil 1 - 10W30: KV100 = 11.60 , KV40 = 71.54
Oil 2 - 0W30: KV100 = 12.18 , KV40 = 73.21
Note: Oil #2 is A3/B4
Calculated viscosity at 0C (32F) is:
Oil 1 : 657.35 cSt
Oil 2 : 637.60 cSt
Calculated viscosity at -17.78C (0F) is:
Oil 1 : 2879.79 cSt
Oil 2 : 2667.69 cSt
Not a huge viscosity diff between a 0W A3/B4 and a 10W30 at freezing 0C (32F).
Q:
is this a very accurate method to estimate or calculate the viscosity? Any other method you guys use?
viscosity calculator:
Viscosity calculator
info from the above web site:
"Calculate the viscosity at a given temperature, when the viscosity is known at two temperatures. The viscosity of a liquid as a function of temperature can be approximated with the Andrade correlation. Given two known temperature-viscosity points, the viscosity of a liquid can be calculated for a target temperature. Lubricating oil producers normally publish the viscosity of their products at two different temperatures.
...
The calculator can be a useful tool for predicting viscosity at a target temperature, but keep in mind that in real world applications a theoretical viscosity value should always be verified with a viscosimeter."
Additional info from petrowiki:
Oil Viscosity
"Andrade's method is based on the observation that the logarithm of viscosity plotted vs. reciprocal absolute temperature forms a linear relationship from somewhat above the normal boiling point to near the freezing point of the oil, as Fig. 6 shows. ..."