TITLE: Conductivity Probe and Data Acquisition for a Liquefaction Cold Model.

AUTHOR: W. Fuchs;   D. Smith.

INST.  AUTHOR: Department of Energy, Pittsburgh, PA. Pittsburgh Energy Technology Center.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  1981,  15p.

ABSTRACT:

A device has deen developed to measure local bubble size and velocity of the gas-phase in a three-phase slurry bubble column operated at coal liquefaction flow conditions. An in situ electrical conductivity twin probe (0.3-cm gap) detects the difference in conductivity of the gas and slurry phases. The analog signal from each probe is rapidly digitized and stored on a waveform recorder and subsequently transmitted and analyzed on a minicomputer. Measured bubble length and velocity are computed from the measured response time interval between probes and the dwell time of a bubble on each probe. A probabilistic model is used to derive actual bubble sizes and velocities. (ERA citation 08:022926)

REPORT  NUMBER: DOE/NBM-3008233