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The Change in Resonant Frequency with Pressure to 8000 atm of Quartz‐Crystal Viscometers

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4 Author(s)
Rein, R.G. ; University of Oklahoma, Norman, Oklahoma 73069 ; Sliepcevich, C.M. ; Babb, S.E. ; Tuma, G.

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Use of a torsionally oscillating quartz rod as a high‐pressure viscometer requires knowledge of the effect of pressure on the resonant frequency of the rod. Measurements were made to determine the change in resonant frequency with pressure to 8000 atm at ambient temperatures (23°–26°C) for crystals with resonant frequencies in air at atmospheric pressure of about 20 and 60 kHz. Smoothed data of the change in resonant frequency with pressure for both crystals are correlated to within ±2 Hz to 6000 atm by Δf0*(P)/f0(1 atm)=-6.897×10-7+1.122×10-4P+2.047×10-5P2, where P is in 1000 atm, and f0*(P) and f0 are in kHz. Above 6000 atm the correlation is less precise because of lower reliability of the 60 kHz data.

Published in:

Journal of Applied Physics  (Volume:40 ,  Issue: 1 )

Date of Publication:

Jan 1969

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