Abstract
The Vogel–Fulcher–Tamman (VFT) correlation is the known most accurate equation used to estimate and predict temperature-dependent viscosity of fluids. But its accuracy analysis for saturated liquids is still unknown. In this paper, we checked its ability for 49 saturated liquids by using the data in the National Institute of Standards and Technology (NIST) Webbook. Through detailed accuracy analysis, we found that the VFT correlation works qualitatively but does not work well quantitavely. We shown the temperature ranges in which the VFT correlation holds for absolute average deviations (AADs) of [Formula: see text][Formula: see text]1%, [Formula: see text][Formula: see text]2% and [Formula: see text][Formula: see text]5%. The corresponding coefficients are also obtained for engineers to use it directly. We also proposed a new four-parameter correlation to improve the predictive ability. We show that the new correlation holds for 5 fluids with AAD [Formula: see text] 1%, 37 fluids with AAD [Formula: see text] 2%, 43 fluids with AAD [Formula: see text] 3% and 48 fluids with AAD [Formula: see text] 4%.
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