Solids-concentration measurement and flow measurement of slurries and sludges using ultrasonic sensors with random data analysis

Abstract

The flow velocity is measured by cross- correlating the output signals from two axially spaced ultrasonic sensors, similar to the sensors described in Part 1 of this paper. A meter factor of 0.84 ± 0.02 was observed to calibrate the measured cross- correlation velocity against actual mean flow velocity, for flow of Reynold's number from 3× 10 3 up to 75 × 103. The meter performance was not affected by change in particle size and concentration; small quantities of gas bubbles (up to 5% by volume) do not affect the calibration curve.