Validation of a vibrating-wire viscometer: measurements in the range of 0.5 to ...

• Author(s): Oliveira, Carla Padrel de ; Caetano, Fernando J. P. ; Fareleira, João M. N. A. ; Wakeham, William A.
• Date: 2005
• Persistent ID: http://hdl.handle.net/10400.2/2039
• Origin: Repositório Aberto da Universidade Aberta
• Subject(s): Vibrating-wire viscometer; Viscosity measurements; Standard reference liquids
• Document Type: Article
• Language: English

Description

The present article describes a novel vibrating-wire viscometer that has been shown to be able to measure viscosities up to 135 mPaâs, after calibration against water at 20 °C, to provide direct traceability to the primary reference for viscosity. For the purpose of validating the instrument, measurements of the viscosity of some selected fluids, including standard reference liquids with viscosity on the order of 100 mPaâs at 20 °C and 2,2,4-trimethylpentane with a viscosity of about 0.5 mPaâs at the same temperature, were performed. The results obtained show that the instrument is capable of performing viscosity measurements with an estimated overall uncertainty better than (0.8% over the range of (0.5 to 135) mPa's.