Predict viscosity at any temperature given two reference viscosities using the ASTM D341 (Walther) relation.
Formula
$$ \log_{10}[\log_{10}(\nu + 0.7)] = A - B \cdot \log_{10}(T) $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $ν$ | Viscosity | cSt | ASTM D445 / D7042 |
| $T$ | Temperature | K | input |
| $A, B$ | Fuel-specific constants | - | derived from two data points |
Sources
- ASTM D341.