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.
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Sharma, J.K.N., Bandyopadhyay, A.K. Effect of viscosity of the pressure-transmitting fluid on the metrological characterization of the piston gauge up to 1 GPa. Pramana - J Phys 37, 363–371 (1991). https://doi.org/10.1007/BF02848489
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DOI: https://doi.org/10.1007/BF02848489