Apparatus for measuring the local void fraction in a flowing liq

Details Apparatus for measuring the local void fraction in a flowing liq Apparatus for measuring the local void fraction in a flowing liq

1979-07-17

1981-08-04

Karlsen, Ernest F.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 65R, 324446, G01R 2702

Patent

active

042824818

ABSTRACT:
The local void fraction in liquid containing a gas is measured by placing an impedance-variation probe in the liquid, applying a controlled voltage or current to the probe, and measuring the probe current or voltage. A circuit for applying the one electrical parameter and measuring the other includes a feedback amplifier that minimizes the effect of probe capacitance and a digitizer to provide a clean signal. Time integration of the signal provides a measure of the void fraction, and an oscilloscope display also shows bubble size and distribution.

REFERENCES:
patent: 3271671 (1966-09-01), Coulter
Hewitt et al., EPRI NP-118, Final Report "Experimental Methods . . . ", Mar. 1976, pp. 70 plus.

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