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Exact calibration of KPG-Ubbelohde-viscometers

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Summary

KPG-Ubbelohde-viscometers for low viscosity fluids were exactly calibrated with an automatic viscosity measuring system from Schott by performing measurements on tridistilled water as a function of the temperature. The time exponent in the Hagenbach-Couette correction term is not, as theoretically determined byCannon et al., equal to 2 but lies between 1.09 and 1.79 in the case of the identical KPG-Ubbelohde-viscometer types put to use in our experiments. Calibration of such viscometers with one fluid at one certain temperature can lead to high viscosity errors in the case of brief flow times.

Zusammenfassung

KPG-Ubbelohde-Viskosimeter für niedrigviskose Flüssigkeiten wurden mit einem automatischen Viskositätsmeßsystem der Fa. Schott durch Messungen von tridestilliertem Wasser in Abhängigkeit von der Temperatur exakt kalibriert. Der Zeit-Exponent im Hagenbach-Couette-Korrekturglied ist nicht wie vonCannon et al. theoretisch abgeleitet gleich zwei, sondern liegt für die eingesetzten KPG-Ubbelohde-Viskosimeter gleichen Typs zwischen 1,09 und 1,79. Die Kalibrierung solcher Viskosimeter mit einer Flüssigkeit bei einer bestimmten Temperatur kann für kurze Ausflußzeiten zu größeren Viskositäts-Fehlern führen.

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Authors and Affiliations

  1. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-1000, Berlin 33, Germany

    J. Melsheimer & N. E. Özaltay

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  1. J. Melsheimer
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  2. N. E. Özaltay
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Part of a thesis of N.E.Ö.

With 2 figures and 9 tables

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Melsheimer, J., Özaltay, N.E. Exact calibration of KPG-Ubbelohde-viscometers. Rheol Acta 19, 660–667 (1980). https://doi.org/10.1007/BF01517519

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  • DOI: https://doi.org/10.1007/BF01517519

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