A capillary tube viscometer designed for measurements of hydrogen gas viscosity at high pressure and high temperature

Elin Yusibani, Yosuke Nagahama, Masamichi Kohno, Yasuyuki Takata, Peter L. Woodfield, Kanei Shinzato, Motoo Fujii

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A capillary tube viscometer was developed to measure the dynamic viscosity of gases for high pressure and high temperature. The apparatus is simple and designed for safe-handling operation. The gas was supplied to the capillary tube from a high-pressure reservoir tank through a pressure regulator unit to maintain a steady state flow. The measurements of a pressure drop across the capillary tube with high accuracy under extreme conditions are the main challenge for this method. A differential pressure sensor for high pressures up to 100MPa is not available commercially. Therefore, a pair of accurate absolute pressure transducers was used as a differential pressure sensor. Then the pressure drop was calculated by subtracting the outlet pressure from the inlet one with a resolution of 100 Pa at 100 MPa. The accuracy of the present measurement system is confirmed by measuring the viscosity of nitrogen as a reference gas. The apparatus provided viscosities of nitrogen from ambient temperature to 500K and hydrogen from ambient temperature to 400 K and for pressures up to 100MPa with a maximum deviation of 2.2% compared with a correlation developed by the present authors and with REFPROP (NIST).

Original languageEnglish
Pages (from-to)1111-1124
Number of pages14
JournalInternational Journal of Thermophysics
Volume32
Issue number6
DOIs
Publication statusPublished - Jun 1 2011

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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