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Effects of Viscosity, Temperature, and Rate of Rotation on the Operation of a Controlled-Clearance Piston Gauge

Published online by Cambridge University Press:  21 February 2011

J.K.N. Sharma ,
Kamlesh K. Jain ,
Vern E. Bean ,
B.E. Welch  and
Ruben J. Lazos
J.K.N. Sharma
Affiliation:
National Physical Laboratory, New Delhi 110012India;
Kamlesh K. Jain
Affiliation:
National Physical Laboratory, New Delhi 110012India;
Vern E. Bean
Affiliation:
National Bureau of Standards, Washington, D.C. 20234, USA;
B.E. Welch
Affiliation:
National Bureau of Standards, Washington, D.C. 20234, USA;
Ruben J. Lazos
Affiliation:
Universidad Autonoma Metropolitana-Azcapotzalco, Mexico City, Mexico
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Abstract

The calculation of the pressure generated by a controlled clearance piston gauge depends upon the jacket pressure corresponding to zero clearance between the piston and cylinder, Pz;. The dependence of Pz; on the viscosity of the pressure transmitting fluid, the temperature, and the rate of piston rotation has been measured.

The value of Pz; is nearly independent of viscosity below 60 cp. Above 60 cp, Pz; depends strongly upon viscosity. Variations of Pz; with femperature and rate of rotation are more severe at figher viscosities.

These results are a clear indication that for the most accurate pressure measurements, a controlled-clearance piston gauge must be characterized using the same operational and environmental conditions with the same fluid as in normal operation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 22: Symposium NY – High Pressure in Science and Technology , 1983 , 265
Copyright
Copyright © Materials Research Society 1984

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References

REFERENCES

1. Heydemann, P.L.M. and Welch, B.E., in Experimental Thermodynamics Vol II, edited by Leneindre, B. and Vodar, B. (Butterworths, London, 1975), pp. 147202.Google Scholar