AN ELECTROSTATIC INDUCTION PROBE FOR MEASURING PARTICLE VELOCITY IN SUSPENSION FLOW

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Abstract
A probe for measuring particle velocity in pipe flow of a gas-solid suspension has been developed. A solid particle such as a 100 µm latex particle in suspension typically carries an electrostatic charge of say 10-13 Coulomb via charge separation by surface contacts in normal handling. The tubular cylindrical probe makes use of the principle of electrostatic induction by a charged solid particle during its passage. This probe, which is insulated from ground by a teflon sleeve, converts the induced charge to voltage signals of sharp rise as the charged particle enters and a steep dip in voltage as it departs from the cylinder. Between the entering peak and the later dip at departure, the time of flight of the particle through the probe can be accurately measured and hence the particle velocity.