• Effect of viscosity of the pressure-transmitting fluid on the metrological characterization of the piston gauge up to 1 GPa

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      https://www.ias.ac.in/article/fulltext/pram/037/04/0363-0371

    • Keywords

       

      Piston gauge; accurate measurement of pressure; effect of viscosity; pressure transmitting fluid

    • Abstract

       

      A systematic theoretical investigation has been carried out to study the effect of viscosity of the pressure-transmitting fluids on the measurement of pressure up to 1 GPa using piston gauges. The fluid flow equation is modified to determine the fall rate (v) with pressure (P), taking the pressure-dependent viscosityη(P) and clearance between piston and cylinder [H(P)] terms into account. Above 0.4 GPa, the fall rate curve shows the tendency to be pressure independent. The near-constancy ofv withP can be avoided with less viscous fluid or by increasingH(P). Finally. the initial clearance obtained from the experimental data of fall rate, shows a weak dependence of pressure, although theoretically it is assumed to be independent of pressure. This weak pressure dependence is attributed to the effect of viscosity of the pressure transmitting fluid.

    • Author Affiliations

       

      J K N Sharma1 A K Bandyopadhyay1

      1. National Physical Laboratory, Dr K S Krishnan Road, New Delhi - 110 012, India
    • Dates

       
  • Pramana – Journal of Physics | News

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