Author(s): Kevin D. Nielsen; Larry J. Weber; Marian Muste
Linked Author(s): Larry J. Weber, Marian Muste
Keywords: DV; Velocity measurements; Bubbly flows; Two-phase flow
Abstract: This report presents the experimental method, results, and conclusions for a study of the capabilities and limits for Acoustic Doppler Velocimeter (ADV) measurements in bubbly flows. The purpose of this project was to investigate procedures to separate the measurements of bubbles from those of water so that the water velocity could be extracted from the ADV time series measurements. A controlled experimental setup was constructed to test the phase discrimination procedures for the ADV. Several water and air bubble combination scenarios are presented. This project demonstrated that for flows with low concentrations of air bubbles it is possible to separate ADV velocities measured on water from those of air bubbles based on the ADV signal strength. The project also demonstrated that air bubbles in the signal path (the space between the acoustic transmitter and the sampling volume) significantly increase the noise of the raw signal leading to errors in the measurement of turbulence intensities.
Year: 1999