4/28/2023 0 Comments Nist refprop license“Reference correlations” for pure-fluid transport properties often cover a wide range of conditions - typically from the triple-point temperature to 1000 K, and up to 100 MPa pressure - and are developed to achieve the lowest possible uncertainties (although perhaps higher than those of reference values). These values are often characterized by the lowest uncertainty possible at the time of their acceptance. Reference values refer to the properties specified at a fixed state condition (specific temperature, pressure and composition) or at a small number of such states. Second, in the case of instruments operating in a relative way, they provide the basis to calibrate one or more unknown constants in the working equation. Internationally accepted “reference values” (known also as “standard reference values”) serve two primary purposes: first, they can provide a means of confirming the operation and experimental uncertainty of any new absolute apparatus and the stability and reproducibility of existing absolute measurement equipment. In this work, we review reference values and correlations for two important fluid transport properties: thermal conductivity and viscosity.
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