Title: Evaluation of a modified Herning – Zipperer method and the method by Schley et al. to compute the dynamic viscosity of natural gases
Authors: van der Grinten, Jos, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 1.4, Gase
Contributors: HostingInstitution: Physikalisch-Technische Bundesanstalt (PTB), ISNI: 0000 0001 2186 1887
Pages:3
Language:en
DOI:10.7795/120.20200724
Resource Type: Text / Article
Publisher: Physikalisch-Technische Bundesanstalt (PTB)
Rights: https://creativecommons.org/licenses/by-nd/4.0/
Creative Commons Attribution-NoDerivatives 4.0 International License
Dates: Available: 2020-07-24
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SHA256 Checksum: f76bc2f0a6d8ab7e6380554d956eb0d254988f6ebce046e5f457f185841b1e0b
Keywords: dynamic viscosity ; natural gas ; evaluation of calculation methods ; hydrogen addition
Abstract: A modified Herning-Zipperer method (H-Z-mod) is still used to calculate the viscosity of natural gas during calibrations. The method can calculate the dynamic viscosity of gas mixtures with a choice of 40 components. In the absence of literature references the method is re-documented in this paper. In addition, the H-Z-mod method has been compared with the RefProp software [3] in the range of -5 ~ 50°C and 1 ~ 101 bar. Using different natural gases, the deviations range between -6% and +7% depending on the gas composition. The viscosity calculation method based on Schley et al. [4] implemented in GasCalc [6], shows deviations ranging between -0.3% and 1.6%. The latter method to be used in the new Closed Loop Pigsar facility, is an order of magnitude more accurate than H-Z-mod. For both methods addition of 20% hydrogen results in an offset of more than 1% and a dispersion increase by more than a factor two.
Citation: van der Grinten, Jos. Evaluation of a modified Herning – Zipperer method and the method by Schley et al. to compute the dynamic viscosity of natural gases, 2020. Physikalisch-Technische Bundesanstalt (PTB). DOI: https://doi.org/10.7795/120.20200724