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Walther Viscosity–Temperature Equation

Predict viscosity at any temperature given two reference viscosities using the ASTM D341 (Walther) relation.

FuelViscosity
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Formula, assumptions, and limits

log⁡10[log⁡10(ν+0.7)]=A−B⋅log⁡10(T)\log_{10}[\log_{10}(\nu + 0.7)] = A - B \cdot \log_{10}(T)
SymbolMeaningUnit
ννViscositycSt
TTTemperatureK
A,BA, BFuel-specific constants

Source: ASTM D341

In short

Predict viscosity at any temperature given two reference viscosities using the ASTM D341 (Walther) relation.

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